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Sauce for the Goose

Intelligent Design, Scientific Methodology, and the Demarcation Problem From Nature of Nature

In December 2005, Judge John E. Jones III ruled that a Dover, Pennsylvania, school district could not tell its biology students about a book in the school library that explained the theory of intelligent design. The judge based his decision on the testimony of expert witnesses — two philosophers, Robert Pennock and Barbara Forrest — who argued that the theory of intelligent design is not scientific by definition.1 Since it is not scientific, the judge reasoned, it must be religious. As he put it in his ruling, “Since ID is not science the conclusion is inescapable that the only real effect of the ID Policy is the advancement of religion.”2 Therefore, he ruled, telling students about the theory of intelligent design would violate the establishment clause of the U.S. Constitution. 

Many people have heard about the theory of intelligent design only from news reports about the Dover trial in 2005.3 Naturally, such reports about the trial and the judge’s decision have strongly influenced public perceptions of the theory. For many people, if they know anything at all about the theory, they know — or think they know — that intelligent design is “religion masquerading as science.” 

I encounter this perception nearly every time I speak about the evidence for intelligent design, whether on university campuses or in the media. When I present the evidence for intelligent design, critics do not typically try to dispute my specific empirical claims. They do not dispute that DNA contains specified information, or that this type of information always comes from a mind, or that competing materialistic theories have failed to account for the DNA enigma. Nor do they even dispute my characterization of the historical scientific method or that I followed it in formulating my case for intelligent design as the best explanation for the evidence. Instead, critics simply insist that intelligent design “is just not science,” sometimes even citing Judge Jones as their authority. 

Since Jones is a lower-level district judge who entered the trial with no apparent background in either science or the history and philosophy of science, and since he made several clear factual errors4 in his ruling, it would be easy to dismiss his opinion. Jones rendered this response all the more tempting by telling one reporter, apparently in all seriousness, that during the trial he planned to watch the old Hollywood film Inherit the Wind for historical background.5 Inherit the Wind is a thinly veiled fictional retelling of the 1925 Scopes “Monkey Trial.” But as historian of science Edward Larson has shown in his Pulitzer Prize-winning Summer for the Gods, the drama is grossly misleading and historically inaccurate. Clearly, Jones had little, if any, relevant expertise from which to make a judgment about the merits or scientific status of intelligent design. 

His opinion, however, reflected a much broader consensus among scientific and academic critics of intelligent design. Indeed, it was later discovered that Jones lifted more than 90 percent of his discussion of “Whether ID Is Science” in his lengthy opinion virtually verbatim from an American Civil Liberties Union brief submitted to him before his ruling. The ACLU brief, in turn, recapitulated the most common reasons for challenging the scientific status of intelligent design based upon the testimony of the ACLU’s own expert witnesses.6 Thus, the Jones opinion and the witnesses who influenced it effectively expressed an entrenched view common not only among members of the media, but within the scientific establishment at large. 

But why isn’t the theory of intelligent design scientific? On what basis do critics of the theory make that claim? And is it justified? 

1. A Matter of Definitions? 

As a philosopher of science, I’ve always thought there was something odd and even disingenuous about the objection that intelligent design is not scientific. The argument shifts the focus from an interesting question of truth to a trivial question of definition. To say that an idea or theory does or does not qualify as science implies an accepted definition of the term by which to make that judgment. But to say that a claim about reality “is not science” according to some definition says nothing about whether the claim is true — unless it can be assumed that only scientific theories are true. A definition of science does not, by itself, tell us anything about the truth of competing statements, but only how to classify them (whether as scientific or something else, such as philosophical, historical, or religious statements). 

So, at one level, I regarded the debate about whether intelligent design qualifies as science as essentially a semantic dispute, one that distracts attention from significant questions about what actually happened in the past to cause life to arise. Does life exhibit evidence of intelligent design or just apparent design? Did life arise by undirected processes, or did a designing intelligence play a role? Surely such questions are not settled by defining one of the competing hypotheses as “unscientific” and then refusing to consider it. 

At another level, the debate is tacitly about the basis of the theory itself. Since the term “science” connotes a rigorous experimental or empirical method for studying nature, denying that an idea is scientific implies that rigorous empirical methods played no role in its formulation. To emphasize this impression, many critics of intelligent design insist that the theory is not testable and, for this reason, is neither rigorous nor scientific.7 Because many people assume that only “the” scientific method produces justified conclusions, the charge that the theory isn’t science seems to justify dismissing it as merely a subjectively based opinion or belief. The objection “ID isn’t science” is code for “It isn’t true,” “It’s disreputable,” and “There is no evidence for it.” 

That is why the claim that intelligent design is not science — repeated often and with great presumed authority — has led many to reject it before considering the evidence and arguments for it. I realized that in order to make my case — and open minds to the evidence in favor of it — I needed to defend the theory of intelligent design against this charge. To do so, indeed to defend any theory against this charge and to do so with intellectual integrity, requires one to navigate some treacherous philosophical waters. To claim that intelligent design is science implicitly invokes a definition of science — some understanding of what science is. But which definition? 

Because of my background, I knew that historians and philosophers of science — the scholars who study such questions — do not agree about how to define science.8 Many doubt there is even a single definition that can characterize all the different kinds of science. In the philosophy of science this is known as the “demarcation problem,” the problem of defining science and distinguishing (or “demarcating”) it from “pseudoscience,” metaphysics, history, religion, or other forms of thought or inquiry. 

Typically philosophers of science have tried to define science and distinguish it from other types of inquiry (or systems of belief ) by studying the methods that scientists use to study nature. But that’s where the trouble started. As historians and philosophers of science studied the methods that scientists use, they realized that scientists in different fields use different methods. 

This, incidentally, is why historians and philosophers of science are generally better qualified to adjudicate the demarcation question than scientific specialists — such as inorganic chemists, for example. As they say of the catcher in baseball, the philosopher and historian of science has a view of the whole field of play, meaning he or she is less likely to fall into the error of defining all of science by the practices used in one corner of the scientific world. I already had some inkling of this from my work as a geophysicist. I was aware that historical and structural geology use distinct (if partially overlapping) methods. But as I delved into the demarcation question, I discovered that different sciences use a wide variety of methods. 

Some sciences perform laboratory experiments. Some do not. Some sciences name, classify, and organize natural objects; some sciences seek to discover natural laws; others seek to reconstruct past events. Some sciences seek to formulate causal explanations of natural phenomena. Some provide mathematical descriptions of natural phenomena. Some sciences construct models. Some explain general or repeatable phenomena by reference to natural laws or general theories. Some study unique or particular events and seek to explain them by reference to past (causal) events. 

Some sciences test their theories by making predictions; some test their theories by assessing their explanatory power; some test their theories by assessing both explanatory power and predictive success. Some methods of scientific investigation involve direct verification; some employ more indirect methods of testing. Some test theories in isolation from competing hypotheses. Some test theories by comparing the predictive or explanatory success of competing hypotheses. Some branches of science formulate conjectures that cannot yet be tested at all. Some sciences study only what can be observed. Some sciences make inferences about entities that cannot be observed. Some sciences reason deductively; some inductively; some abductively. Some use all three modes of inference. Some sciences use the hypothetico-deductive method of testing. Some use the method of multiple competing hypotheses. 

This diversity of methods has doomed attempts to find a single definition (or set of criteria) that accurately characterizes all types of science by reference to their methodological practices. Thus, philosophers of science now talk openly about the “demise” of attempts to demarcate or define science by reference to a single set of methods.9 

To say that an idea, theory, concept, inference, or explanation is or isn’t scientific requires a particular definition of science. Yet if different scientists and philosophers of science could not agree about what the scientific method is, how could they decide what did and did not qualify as science? And how could I argue that the theory of intelligent design is scientific, if I could not say what I meant by “science”? Conversely, how could critics of intelligent design assert that intelligent design is not science without articulating the standard by which they made this judgment? How could any headway in this debate be made without an agreed-upon definition? 

I discovered that though it was difficult to define science by reference to a single definition or set of methodological criteria, it was not difficult to define science in such a way that either acknowledged the diversity of methodological practices or refused to specify which method made a discipline scientific. Such an approach allows science to be defined more broadly as, for instance, “a systematic way of studying nature involving observation, experimentation, and/or reasoning about physical phenomena.” So far, so good. The difficulty has come when scholars tried to equate science with a particular systematic method of studying nature to the exclusion of other such methods. 

The situation was not hopeless, however. I discovered that although it was impossible to describe the rich variety of scientific methods with a single definition, it was possible to characterize the methodological practices of specific disciplines or types of science. This made sense. It was precisely the diversity of scientific methods that made defining science as a whole difficult in the first place. Focusing on a single established scientific method as the relevant standard of judgment eliminated the practical problem of deciding how to assess the scientific status of a theory without an established definition of science. Furthermore, from my own studies, I knew the methodological practices of the sciences directly relevant to the questions I was pursuing — the sciences that investigate the causes of particular events in the remote past. Stephen Jay Gould called these sciences the historical sciences.10 I knew that the inference to design followed from a rigorous application of the logical and methodological guidelines of these disciplines. If one carefully follows these guidelines in constructing a case for design, one is entitled to conclude there is a good (if definition-dependent) reason to regard intelligent design as a scientific — and, specifically, historically scientific — theory. In fact, there are several such reasons. 

Reason 1: The Case for ID Is Based on Empirical Evidence 

The case for intelligent design, like other scientific theories, is based upon empirical evidence, not religious dogma. Contrary to the claims of Robert Pennock,11 one of the expert witnesses in the Dover trial, design theorists have developed specific empirical arguments to support their theory. To name just one example, I have developed an argument for intelligent design based on the discovery of digital information in the cell.12 In addition, other scientists now see evidence of intelligent design in the “irreducible complexity” of molecular machines and circuits in the cell,13 the pattern of appearance of the major groups of organisms in the fossil record,14 the origin of the universe and the fine-tuning of the laws and constants of physics,15 the finetuning of our terrestrial environment,16 the information processing system of the cell, and even in the phenomenon known as “homology” (evidence previously thought to provide unequivocal support for neo-Darwinism).17 Critics may disagree with the conclusions of these design arguments, but they cannot reasonably deny that they are based upon commonly accepted observations of the natural world. Since the term “science” commonly denotes an activity in which theories are developed to explain observations of the natural world, the empirical, observational basis of the theory of intelligent design provides a good reason for regarding intelligent design as a scientific theory. 

Reason 2: Advocates of ID Use Established Scientific Methods 

The case for intelligent design follows from the application of not one, but two separate systematic methods of scientific reasoning — methods that establish criteria for determining when observed evidence supports a hypothesis. The primary method, the method of multiple competing hypotheses, may be used to justify an inference to intelligent design as the best explanation for the origin of biological information. This method is a standard method of scientific reasoning in several well-established scientific disciplines. Advocates of intelligent design have also developed another method that complements the method of multiple competing hypotheses. 

In The Design Inference (and in subsequent works), William Dembski established criteria by which intelligently designed systems can be identified by the kinds of patterns and probabilistic signatures they exhibit. On the basis of these criteria, Dembski developed a comparative evaluation procedure—his explanatory filter18 — to guide our analysis and reasoning about natural objects and artifacts and to help investigators decide among three different types of explanations: chance, necessity, and design.19 As such, it constitutes a rigorous, systematic, evidence-based method for detecting the effects of intelligence, again suggesting a good reason to regard intelligent design as scientific in accord with common definitions of the term. In more recent work, Dembski has collaborated with Robert Marks to show that Darwinian evolution cannot generate new biological information, but rather, insofar as it is operative in biology, is itself inherently teleological and derivative of an intelligent source characterizable in precise information-theoretic terms.20 

Reason 3: ID Is a Testable Theory 

Most scientists and philosophers of science think that the ability to subject theories to empirical tests constitutes an important aspect of any scientific method of study. But for a theory to be testable, there must be some evidential grounds by which it could be shown to be incorrect or inadequate. And, contrary to the repeated claims of its detractors, the theory of intelligent design is testable. In fact, it is testable in several interrelated ways. 

First, like other scientific theories concerned with explaining events in the remote past, intelligent design is testable by comparing its explanatory power to that of competing theories. Darwin used this method of testing in On the Origin of Species. In the presentation of the case for intelligent design in my book Signature in the Cell, I tested the theory in exactly this way by comparing the explanatory power of intelligent design against that of several other classes of explanation. That the theory of intelligent design can explain the origin of biological information (and the origin of the cell’s interdependent information processing system) better than its materialistic competitors shows that it has passed an important scientific test. 

This comparative process is not a hall of mirrors, a competition without an external standard of judgment. The theory of intelligent design, like the other historical scientific theories it competes against, is tested against our knowledge of the evidence in need of explanation and our knowledge of the cause-and-effect structure of the world. Evaluations of “causal adequacy” guide historical scientific reasoning and help to determine which hypothesis among a competing group of hypotheses has the best explanatory power. Considerations of causal adequacy provide an experience-based criterion by which to test — accept, reject, or prefer — competing historical scientific theories. When such theories cite causes that are known to produce the effect in question, they meet the test of causal adequacy; when they fail to cite such causes, they fail to meet this test.21 

Since empirical considerations provide grounds for rejecting historical scientific theories or preferring one theory over another, such theories are clearly testable. Like other historical scientific theories, intelligent design makes claims about the causes of past events, thus making it testable against our knowledge of cause and effect. Moreover, because experience shows that an intelligent agent is not only a known, but also the only known cause of specified, digitally encoded information, the theory of intelligent design passes two critical tests: the tests of causal adequacy and causal existence as the explanation for any observed occurrence of such information. Precisely because intelligent design uniquely passes these tests, I argue that it stands as the best explanation for the origin of DNA. 

Finally, though historical scientific theories typically do not make predictions that can be tested under controlled laboratory conditions, they do sometimes generate discriminating predictions about what we should find in the natural world — predictions that enable scientists to compare them to other historical scientific theories. The theory of intelligent design has generated a number of such discriminating empirical predictions. These predictions not only distinguish the theory of intelligent design from competing evolutionary theories; they also serve to confirm the design hypothesis rather than its competitors.22 

Reason 4: The Case for ID Exemplifies Historical Scientific Reasoning 

There is another good, if convention-dependent, reason for classifying intelligent design as a scientific theory. Not only do scientists use systematic methods to infer intelligent design; the specific methods they use conform closely to established patterns of inquiry in the historical scientific disciplines — disciplines that try to reconstruct the past and explain present evidence by reference to past causes rather than trying to classify or explain unchanging laws and properties of nature. Indeed, the theory of intelligent design and the patterns of reasoning used to infer and defend it exemplify each of the four key features of a historical science. 

A Distinctive Historical Objective 

Historical sciences focus on questions of the form, “What happened?” or “What caused this event or that natural feature to arise?” rather than questions of the form, “How does nature normally operate or function?” or “What causes this general phenomenon to occur?”23 Those who postulate the past activity of an intelligent designer do so as an answer, or as a partial answer, to distinctively historical questions. The theory of intelligent design attempts to answer a question about what caused certain features in the natural world to come into existence — such as the digitally encoded, specified information present in the cell. It attempts to answer questions of the form “How did this natural feature arise?” as opposed to questions of the form “How does nature normally operate or function?” 

A Distinctive Form of Inference 

The historical sciences use inferences with a distinctive logical form. Unlike many non-historical disciplines, which typically infer generalizations or laws from particular facts (induction), historical sciences employ abductive logic to infer a past event from a present fact or clue. Such inferences are also called “retrodictive.” As Gould put it, the historical scientist infers “history from its results.”24 Inferences to intelligent design exemplify this abductive and retrodictive logical structure. They infer a past unobservable cause (in this case, an instance of creative mental action or agency) from present facts or clues in the natural world, such as the specified information in DNA, the irreducible complexity of certain biological systems, and the finetuning of the laws and constants of physics.25 

A Distinctive Type of Explanation 

Historical sciences usually offer causal explanations of particular events, not law-like descriptions or theories describing how certain kinds of phenomena — such as condensation or nuclear fission — generally occur. In historical explanations, past causal events, not laws or general physical properties, do the main explanatory work.26 To explain a dramatic erosional feature in eastern Washington called the Channeled Scablands, a historical geologist posited an event: the collapse of an ice dam and subsequent massive flooding. This and other historical scientific explanations emphasize past events as causes for subsequent events and/or present features of the world. 

The theory of intelligent design offers such a distinctively historical form of explanation. Theories of design invoke the act or acts of an agent and conceptualize those acts as causal events, albeit ones involving mental rather than purely physical entities. Advocates of design postulate past causal events (or a sequence of events) to explain the origin of present evidence or clues, just as proponents of chemical evolutionary theories do. 

Use of the Method of Multiple Competing Hypotheses

Historical scientists do not mainly test hypotheses by assessing the accuracy of the predictions they make under controlled laboratory conditions. Using the method of multiple competing hypotheses, historical scientists test hypotheses by comparing their explanatory power against that of their competitors. And advocates of the theory of intelligent design also use this method. 

In sum, the theory of intelligent design seeks to answer characteristically historical questions, it relies upon abductive/retrodictive inferences, it postulates past causal events as explanations of present evidence, and it is tested indirectly by comparing its explanatory power against that of competing theories. Thus, the theory of intelligent design exhibits each of the main features of a historical science, suggesting another reason to regard it as scientific. 

Reason 5: ID Addresses a Specific Question in Evolutionary Biology 

There is another closely related reason to regard intelligent design as a scientific theory. It addresses a key question that has long been part of historical and evolutionary biology: How did the appearance of design in living systems arise? Both Darwin and contemporary evolutionary biologists such as Francisco Ayala, Richard Dawkins, and Richard Lewontin acknowledge that biological organisms appear to have been designed.27 Nevertheless, for most evolutionary theorists, the appearance of design is considered illusory, because they are convinced that the mechanism of natural selection acting on random variations (and/or other similarly unguided mechanisms) can fully account for the appearance of design in living organisms.28 

In On the Origin of Species, Darwin sought to show that natural selection has creative powers comparable to those of intelligent human breeders. In doing so, he sought to refute the design hypothesis by providing a materialistic explanation for the origin of the appearance of design in living organisms. Following Aleksandr Oparin, chemical evolutionary theorists have sought to provide similarly naturalistic accounts for the appearance of design in the simplest living cells. 

Is the appearance of design in biology real or illusory? Clearly, there are two possible answers to this question. Neo-Darwinism and chemical evolutionary theory provide one answer, and the competing theory of intelligent design provides the opposite answer. By almost all accounts the classical Darwinian answer to this question — “The appearance of design in biology does not result from actual design” — has long been considered a scientific proposition. But what is the status of the opposite answer? If the proposition “Jupiter is made primarily of methane gas” is a scientific proposition, then the proposition “Jupiter is not made primarily of methane gas” would seem to be a scientific proposition as well. The negation of a proposition does not make it a different type of claim. Similarly, the claim “The appearance of design in biology does not result from actual design” and the claim “The appearance of design in biology does result from actual design” are not two different kinds of propositions; they are two different answers to the same question, a question that has long been part of evolutionary biology and historical science. If one of these propositions is scientific, then it would seem that the other is scientific as well.29 

Reason 6: ID Is Supported by Peer-Reviewed Scientific Literature 

Critics of the theory of intelligent design often claim that its advocates have failed to publish their work in peer-reviewed scientific publications. For this reason, they say the theory of intelligent design does not qualify as a scientific theory.30 According to these critics, science is what scientists do. Since ID scientists don’t do what other scientists do — namely, publish in peer reviewed journals — they are not real scientists and their theory isn’t scientific either. 

Critics of the theory of intelligent design made this argument before and during the Dover trial in support of the ACLU’s case against the Dover school board policy. For example, Barbara Forrest, a philosophy professor from Southeastern Louisiana State University and one of the expert witnesses for the ACLU, asserted in a USA Today article before the trial that design theorists “aren’t published because they don’t have any scientific data.”31 In her expert witness report in support of the ACLU, Forrest also claimed that “there are no peer-reviewed ID articles in which ID is used as a biological theory in mainstream scientific databases such as MEDLine.”32 Judge Jones apparently accepted such assertions at face value. In his decision, he stated not once, but five separate times, that there were no peer-reviewed scientific publications supporting intelligent design.33 

But Dr. Forrest’s carefully qualified statement gave an entirely misleading impression. In 2004, a year in advance of the trial, I published a peer-reviewed scientific article advancing the theory of intelligent design in a mainstream scientific journal. The publication of this article evoked a huge backlash at the Smithsonian Institution, where the journal, The Proceedings of the Biological Society of Washington, was published. Moreover, controversy about the editor’s decision and his subsequent treatment spilled over into both the scientific and the mainstream press, with articles about it appearing in Science, Nature, the Wall Street Journal, and the Washington Post, among other places.34 Both Dr. Forrest and Judge Jones had every opportunity to inform themselves about the existence of at least one peer-reviewed scientific article in support of intelligent design.

In any case, as my institute informed the court in an amicus curiae brief, my article was by no means the only peer-reviewed or peer-edited scientific publication in support of the theory of intelligent design.35 By 2005, scientists and philosophers advocating the theory of intelligent design had already developed their theory and the empirical case for it in peer-reviewed scientific books published both by trade presses36 and by university presses.37 Michael Behe’s groundbreaking Darwin’s Black Box was published by the Free Press in New York. William Dembski’s The Design Inference was published by Cambridge University Press. Both were peerreviewed. In addition, design proponents have also published scientific articles advancing the case for intelligent design in peer-reviewed scientific books and anthologies published by university presses38 and in scientific conference proceedings published by university presses and trade presses.39 Advocates of intelligent design have also published work advancing their theory in peer-reviewed philosophy of science journals and other relevant interdisciplinary journals.40 Moreover, since the publication of my article in 2004, several other scientific articles supporting intelligent design (or describing research guided by an ID perspective) have been published in mainstream peer-reviewed scientific journals.41 

Of course, critics of intelligent design may still judge that the number of published books and articles supporting the theory does not yet make it sufficiently mainstream to warrant teaching students about it. Perhaps.42 But that is a judgment about educational policy distinct from deciding the scientific status, or still less, the merits of the theory of intelligent design itself. Clearly, there is no magic number of supporting peer-reviewed publications that suddenly confers the adjective “scientific” on a theory; nor is there a tribunal vested with the authority to make this determination. If there were a hard and-fast numerical standard as low as even one, no new theory could ever achieve scientific status. Each new theory would face an impossible catch-22: for a new theory to be considered “scientific” it must have appeared in the peerreviewed scientific literature, but any time a scientist submitted an article to a peer-reviewed science journal advocating a new theory, it would have to be rejected as “unscientific” on the grounds that no other peer-reviewed scientific publications existed supporting the new theory. 

Critics of intelligent design have actually used a similarly circular kind of argument to claim that ID is not science. Before 2004, critics argued that the theory of intelligent design was unscientific, because there were no published articles supporting it in peer-reviewed scientific journals (ignoring the various peer-reviewed books that existed in support of ID). Then once a peer-reviewed scientific journal article was published supporting intelligent design, critics claimed that the article should not have been published, because the theory of intelligent design is inherently unscientific.43 Indeed, critics accused the editor who published my article of editorial malfeasance, because they thought he should never have considered sending the article out for peer review in the first place.44 Why? Because, according to these critics, the perspective of the article should have immediately disqualified it from consideration. In short, critics argued that “intelligent design is not scientific because peer-reviewed articles supporting the theory have not been published” and that “peer-reviewed articles supporting intelligent design should not be published because the theory is not scientific,” apparently never recognizing the patent circularity of this self-serving, exclusionary logic. 

Logically, the issue of peer review is a red herring — a distracting procedural side issue. The truth of a theory is not determined or guaranteed by the place of, or procedures followed, in its publication.45 Many great scientific theories were first advanced and published without undergoing formal peer review. Though modern peer-review procedures often do a good job of catching and correcting factual mistakes, they also can enforce ideological conformity, stifle innovation, and resist novel theoretical insights. Scientific experts can make mistakes in judgment and, being human, they sometimes reject good new ideas because of prejudicial attachments to older, more familiar ones. The history of science is replete with examples of established scientists summarily dismissing new theories that later proved able to explain the evidence better than previously established theories. In such situations, proponents of new theories have often found traditional organs of publication closed to them. Thus, it is neither surprising nor damning to intelligent design that currently many scientific journals are implacably opposed to publishing articles supporting the theory. 

Yet if science is what scientists do, and if publishing peer-reviewed scientific books and articles is part of what scientists do that makes their theories scientific (as critics of ID assert), then there is another good, convention-dependent reason to regard intelligent design as scientific. The scientists who have developed the case for intelligent design have begun to overcome the prejudice against their ideas and have published their work in peer-reviewed scientific journals, books, conference volumes, and anthologies.46 

So we see that the issue of whether intelligent design qualifies as a scientific theory depends upon the definition of science chosen to decide the question. But consideration of both common definitions of science and the specialized methodological practice of the historical sciences has shown that there are many good — if definition-dependent — reasons for considering intelligent design as a scientific theory. 

Maybe there is some other, better definition of science that should be considered; perhaps some specific feature of a scientific theory that intelligent design does not possess, or some specific criterion of scientific practice that its advocates do not follow. Intelligent design meets the criterion of testability, despite what many critics of the theory asserted, but perhaps there are other criteria that it cannot meet. If so, then perhaps these definitional criteria establish a good reason for disqualifying intelligent design from consideration as science after all. Certainly, many critics of intelligent design have argued that the theory lacks many key features of a bona fide scientific theory — that it fails to meet criteria by which science could be defined and distinguished from non-science, metaphysics, or religion. In light of this, we need to examine why critics of the theory — including the judge in the Dover case — have insisted that, despite the arguments just outlined, intelligent design does not qualify as a scientific theory. 

2. Intelligent Design and Explanation by Natural Law 

Michael Ruse has argued that “there are no powers, seen or unseen, that interfere with or otherwise make inexplicable the normal working of material objects.”47 Since the scientific enterprise is characterized by a commitment to “unbroken regularity” or “unbroken law,”48 scientific theories must explain events or phenomena by reference to natural laws.49 And since intelligent design invokes an event — the conscious activity of a designing agent — rather than a law of nature to explain the origin of biological form and information, Ruse argued that it was scientifically “inappropriate.” Ruse also seemed to think that if an intelligent designer had acted during the history of life, then its actions would have necessarily violated the laws of nature, since intelligent agents typically interfere with the otherwise “normal workings of material objects.” Since, for Ruse, the activity of an intelligent designer violates the laws of nature, positing such activity — rather than a law — would violate the rules of science. 

In response,50 I have pointed out that the activity of a designing intelligence does not necessarily break or violate the laws of nature. Human agents design information-rich structures and otherwise interfere with the “normal workings of material objects” all the time. When they do, they do not violate the laws of nature; they alter the conditions upon which the laws act. When I arrange magnetic letters on a metallic display board to spell a message, I alter the way in which matter is configured, but I do not alter or violate the laws of electromagnetism. When agents act, they initiate new events within an existing matrix of natural law without violating those laws.51 

I have also pointed out that Ruse’s key demarcation criterion, if applied strictly, cut just as much against Darwinian and chemical evolutionary theories (as well as many other scientific theories) as it did against intelligent design. For example, natural laws often describe but do not explain natural phenomena. Newton’s law of universal gravitation described, but did not explain, what caused gravitational attraction. A strict application of Ruse’s second criterion would therefore imply that Newton’s law of gravity is “unscientific,” since it does not offer an explanation by natural law. 

Many historical scientific theories do not offer an explanation by natural law. Instead, they postulate past events (or patterns of events) to explain other past events as well as presently observable evidence. Historical theories explain mainly by reference to events or causes, not laws. For example, if a historical geologist seeks to explain what caused the unusual height of the Himalayas, he or she will cite particular events or factors that were present in the case of the Himalayan mountain-building episode that were not present in other such episodes. Knowing the laws of physics that describe the forces at work in all mountain-building events will not aid the geologist in accounting for the contrast between the Himalayas and other mountain ranges. To explain what caused the Himalayas to rise to such heights, the geologist does not need to cite a general law, but instead to give evidence of a distinctive set of past events or conditions.52 Evolutionary theories, in particular, often emphasize the importance of past events in their explanations.53 Aleksandr Oparin’s chemical evolutionary theory, for example, postulated a series of events (a scenario), not a general law, in order to explain how the first living cells arose. 

Of course, past events and historical scenarios are assumed to take place in a way that obeys the laws of nature. Moreover, our knowledge of cause-and-effect relationships (which we can sometimes formulate as laws) will often guide the inferences that scientists make about what happened in the past and will influence their assessment of the plausibility of competing historical scenarios and explanations. Even so, many historical scientific theories make no mention of laws at all. Laws at best play only a secondary role in historical scientific theories. Instead, events play the primary explanatory role. 

The theory of intelligent design exemplifies the same style of scientific explanation as other historical scientific theories. Intelligent design invoked a past event — albeit a mental event — rather than a law to explain the origin of life and the complexity of the cell. As in other historical scientific theories, our knowledge of cause and effect (“information habitually arises from conscious activity”) supports the inference to design. A law (conservation of information)54 also helps to justify the inference of an intelligent cause as the best explanation. Advocates of intelligent design use a law (“since there is no informational ‘free lunch,’ the origin of complex specified information always requires intelligent input”) to infer a past causal event, the act of a designing mind. But that act or event explains the evidence in question. Though laws play a subsidiary role in the theory, a past event (or events) explains the ultimate origin of biological information. 

But if explaining events primarily by reference to prior events, rather than laws, does not disqualify other historical scientific theories, including evolutionary theories, from consideration as science, then by the same logic it should not disqualify the theory of intelligent design either. Oddly, in a discussion of population genetics—part of the explanatory framework of contemporary Darwinian theory—Ruse himself noted that “it is probably a mistake to think of modern evolutionists as seeking universal laws at work in every situation.”55 But if laws can play no role or only a subsidiary role in other historical theories, then why was it “inappropriate” for a law to play only a supportive role in the theory of intelligent design? 

Conversely, if invoking a past event, rather than a law, made intelligent design unscientific, then by the same token it should make materialistic evolutionary theories unscientific as well. Either way, Ruse’s key criterion for scientific status does not provide a basis for discriminating the scientific status of the two types of theories. Both are equivalent in their capacity to meet Ruse’s definitional standard. 

3. Defeaters Defeated 

I have been thinking about the “intelligent design isn’t science” objection for a number of years now. As I have done so, I have come to a radical conclusion: not only were there many good — if convention-dependent — reasons for classifying intelligent design as a historical scientific theory, but there were no good — that is, non-question-begging — reasons to define intelligent design as unscientific. Typically those who argued that “intelligent design isn’t science” invoked various demarcation criteria. I have encountered numerous such arguments. Critics claim that intelligent design does not qualify as a scientific theory because: (1) it invokes an unobservable entity,56 (2) it is not testable,57 (3) it does not explain by reference to natural law,58 (4) it makes no predictions,59 (5) it is not falsifiable,60 (6) it cites no mechanisms,61 and (7) it is not tentative.62 

As I studied these arguments I discovered a curious pattern. Invariably, if the critics applied their definitional criteria—such as observability, testability, or “must explain by natural law”— in a strict way, these criteria not only disqualified the design hypothesis from consideration as science; they also disqualified its chief rivals — other historical scientific theories — each of which invoked undirected evolutionary processes. 

Conversely, I discovered that if these definitional criteria were applied in a less restrictive way — perhaps one that took into account the distinctive historical aspects of inquiry into the origin of life — then these criteria not only established the scientific bona fides of various rivals of intelligent design; they confirmed the scientific status of the design hypothesis as well. In no case, however, did these demarcation criteria successfully differentiate the scientific status of intelligent design and its competitors. Either science was defined so narrowly that it disqualified both types of theory, or it was defined so broadly that the initial reasons for excluding intelligent design (or its competitors) evaporated. If one theory met a specific criterion, then so did the other; if one theory failed to do so, then its rival also failed — provided the criteria were applied in an evenhanded and non-question-begging way. Intelligent design and its materialistic rivals were equivalent in their ability to meet various demarcation criteria or methodological norms. Given this methodological equivalence, and given that materialistic evolutionary theories were already widely regarded as scientific, I couldn’t see any reason to classify intelligent design as unscientific. The defeaters didn’t work. 

Because these “defeaters” are used against intelligent design all the time, it’s important to see why they fail. So, in what follows, I examine some additional demarcation arguments that are commonly used against intelligent design. (I will not provide an exhaustive demonstration of this equivalence since that would require a book-length argument the details of which only philosophers of science could endure. For those with the requisite endurance, however, various materials are available.)63 

3.1 Observability 

According to critics of intelligent design, the unobservable character of a designing intelligence renders it inaccessible to empirical investigation and, therefore, makes it unscientific. For example, in 1993 biophysicist Dean Kenyon was removed from teaching his introductory biology class at San Francisco State University after he discussed his reasons for supporting intelligent design with his students. His department colleagues believed their actions against him were justified because they believed that he had been discussing an unscientific theory with his class. Some of Kenyon’s colleagues argued that the theory of intelligent design did not qualify as a scientific theory because it invoked an unobservable entity, in particular, an unseen designing intelligence. In making this argument, Kenyon’s colleagues assumed that scientific theories must invoke only observable entities. Since Kenyon discussed a theory that violated this convention, they insisted that neither the theory he discussed, nor he himself, belonged in the biology classroom.64 

Others who defended the action of the biology department, such as Eugenie Scott of the National Center for Science Education, used a similar rationale. She insisted that the theory of intelligent design violated the rules of science because “you can’t put an omnipotent deity in a test tube (or keep it out of one).”65 Molecular biologist Fred Grinnell has similarly argued that intelligent design can’t be a scientific concept, because if something “can’t be measured, or counted, or photographed, it can’t be science.”66 

But was that really the case? Does a reference to an unobservable entity provide a good reason for defining a theory as unscientific? Does my postulation of an unobservable intelligence make my case for intelligent design unscientific? 

The answer to that question depends, again, upon how science is defined. If scientists (and all other relevant parties) decide to define science as an enterprise in which scientists can posit only observable entities in their theories, then clearly the theory of intelligent design would not qualify as a scientific theory. Advocates of intelligent design infer, rather than directly observe, the designing intelligence responsible for the digital information in DNA.

But this definition of science would render many other scientific theories, including many evolutionary theories of biological origins, unscientific by definition as well. Many scientific theories infer or postulate unobservable entities, causes, and events. Theories of chemical evolution invoke past events as part of the scenarios they use to explain how the modern cell arose. Insofar as these events occurred millions of years ago, they are clearly not observable today. Darwinian biologists, for their part, have long defended the putatively unfalsifiable nature of their claims by reminding critics that many of the creative processes to which they refer occur at rates too slow to observe in the present and too fast to have been recorded in the fossil record. Furthermore, the existence of many transitional intermediate forms of life, the forms represented by the nodes on Darwin’s famous branching tree diagram, are also unobservable.67 Instead, unobservable transitional forms of life are postulated to explain observable biological evidence — as Darwin himself explained. But how is this different from postulating the past activity of an unobservable designing intelligence to explain observable features of the living cell? Neither Darwinian transitional forms, neo-Darwinian mutational events, the “rapid branching” events of Stephen Jay Gould’s theory of punctuated equilibria, the events comprising chemical evolutionary scenarios, nor the past action of a designing intelligence are directly observable. With respect to direct observability, each of these theories is equivalent. 

Thus, if the standard of observability is applied in a strict way, neither intelligent design nor any other theory of biological origins qualifies as a scientific theory. But let’s consider the flip side. What if the standard of observability is applied in a more flexible and, perhaps, realistic way? What if science is defined as an enterprise that examines the observable natural world, but does not necessarily explain empirical observations by reference to observable entities? 

Does it make sense to define science in this more flexible way? It does. Many entities and events posited in scientific theories cannot be observed directly either in practice, or sometimes even in principle. Instead, scientists often infer the existence of unobservable entities in order to explain observable events, evidence, or phenomena. Physical forces, electromagnetic or gravitational fields, atoms, quarks, past events, subsurface geological features, biomolecular structures — all are unobservable entities inferred from observable evidence. In 2008, under the border between France and Switzerland, European scientists unveiled the Large Hadron Collider. This supercollider will enable physicists to “look” for various elementary particles, including the elusive Higgs boson. None of the particles they hope to find are observable in any direct sense. Instead, physicists try to detect them by the energetic signatures, traces, or decay products they leave behind. 

Scientists in many fields detect unobservable entities and events by their effects. They often infer the unseen from the seen. Nevertheless, such entities and events are routinely considered to be part of scientific theories. Those who argue otherwise confuse the event or evidence in need of explanation (which in scientific investigations is nearly always observable in some way) with the event or entity doing the explaining (which often is not). 

The presence of unobservable entities in scientific theories creates a problem for those who want to use observability as a demarcation criterion by which to disqualify intelligent design from consideration as scientific. Many theories that are widely acknowledged to be scientific invoke unobservable entities. But if these theories, which include materialistic theories of biological origins, can invoke unobservable entities or events to explain observable evidence and still qualify as scientific, then why can’t the theory of intelligent design do so as well? 

3.2 Testability Revisited 

I earlier mentioned that the theory of intelligent design is testable by empirical means. But for years, I have talked to people — scientists, theologians, philosophers, lawyers, journalists, callers on talk shows — who purport to know that the theory of intelligent design cannot be tested.68 Sometimes these critics say that intelligent design is untestable because the designing intelligence is unobservable, thus combining two demarcation criteria, observability and testability. Other times these critics assert that intelligent design cannot be tested because they assume that ID advocates must posit an omnipotent deity. And yet other critics say that intelligent design is untestable because the actions of intelligent agents (of any kind) are inherently unpredictable, and testability depends upon the ability to make predictions. 

These common objections to the testability and thus the scientific status of intelligent design have dissuaded many people from even considering evidence for intelligent design. So what should we make of these demarcation arguments against intelligent design? Do they provide a good reason for denying that intelligent design is a scientific theory? Do they show, despite the considerations we have offered to the contrary, that intelligent design cannot be tested? Let’s take a closer look. 

3.3 Unobservables and Testability 

Robert Pennock, one of the witnesses in the Dover trial, argued that the unobservable character of a designing intelligence precludes the possibility of testing intelligent design scientifically because, as he explained, “science operates by empirical principles of observational testing; hypotheses must be confirmed or disconfirmed by reference to . . . accessible empirical data.”69 Eugenie Scott also seemed to argue that intelligent design cannot be tested because it invokes an unobservable entity. In the article I cited above, in which she defended the actions of Kenyon’s detractors at San Francisco State, Scott also linked the criterion of observability to testability. After saying, “You can’t put an omnipotent deity in a test tube,” she went on to say: “As soon as creationists invent a ‘theo-meter,’ maybe then we can test for miraculous intervention. You can’t (scientifically) study variables you can’t test, directly or indirectly.”70 

In this version of the argument, critics insist that the unobservable character of a designing intelligence renders the theory inaccessible to empirical investigation, making it both untestable and unscientific. So both “observability” and “testability” are asserted as necessary to scientific status and the converse of one (unobservability) is asserted to preclude the possibility of the other (testability). Superficially this version of the argument seems a bit more persuasive than demarcation arguments that simply invoke observability by itself to disqualify design. Yet it does not stand up to close inspection either. 

In the first place, there are many testable scientific theories that refer to unobservable entities. For example, during the race to elucidate the structure of the genetic molecule, both double helix and triple helix models were considered, since both could explain the X-ray images of DNA crystals.71 Although neither structure could be observed directly, the double helix of Watson and Crick eventually won out because it could explain other observations that the triple helix model could not. The inference to one unobservable structure (the double helix) was accepted because it was judged to possess greater explanatory power than its competitor. 

Claims about unobservables are routinely indirectly tested against observable evidence in scientific experiments. In many fields of science the existence of an unobservable entity or event is inferred from the positive outcome of testing for the consequences that would result if that hypothesized entity or event (i.e., an unobservable) were accepted as actual, or by the explanatory power the postulation of such an entity or event provides when contrasted with competing hypotheses. Thus, many sciences infer to the best explanation — where the explanation presupposes the reality of an unobservable entity or event — including theoretical physics, geology, molecular biology, genetics, cosmology, psychology, physical and organic chemistry, and evolutionary biology. 

Secondly, the historical sciences, in particular, commonly use indirect methods of testing, methods that involve assessing the causal powers of competing unobservable events to determine which would, if true, possess the greatest explanatory power. Notably, Darwin defended the scientific status of his theory by arguing that an assessment of the relative explanatory power of his theory of common descent — a theory about the unobservable past — was a perfectly legitimate and acceptable method of scientific testing.72 

Finally, intelligent design is testable in precisely this fashion — by examining its explanatory power and comparing it to that of competing hypotheses. The unobservable intelligence postulated by the theory of intelligent design does not preclude tests of its existence as long as indirect methods of testing hypotheses — such as evaluating comparative explanatory power — are recognized as scientific. If, however, science is defined more narrowly so that only the direct observation of a causal factor counts as a confirmatory test of a causal hypothesis, then neither intelligent design nor a host of other theories qualify as scientific. 

Either way, the theory of intelligent design and various evolutionary theories of origins are equivalent in their ability to meet the joint criteria of observability and testability. If critics of intelligent design construe these criteria as forbidding both the indirect testing of hypotheses postulating unobservables and inferences to the existence of such unobservables if such tests are favorable, then both intelligent design and its competitors fail to be scientific. On the other hand, if critics construe these criteria to allow inferences to, and indirect testing of, unobservable entities and events, then both intelligent design and many competing evolutionary theories qualify as scientific theories. Either way, these criteria fail to discriminate between intelligent design and many other theories that are already accepted as scientific, and so they fail to provide a good reason for disqualifying intelligent design from consideration as a scientific theory. What is sauce for the goose is sauce for the gander. 

3.4 Testability, Omnipotence, and the Supernatural 

Robert Pennock argues that there is something else about the unobservable designing intelligence posited by intelligent design that makes it untestable. Specifically, Pennock claims that intelligent design is untestable because it invokes an unobservable supernatural being with unlimited powers. He argues that since such a being has powers that could be invoked to “explain any result in any situation,” all events are consistent with the actions of such a being. Therefore, no conceivable event could disprove the hypothesis of intelligent design. As Ken Miller asserts, “The hypothesis of design is compatible with any conceivable data, [and] makes no testable predictions.”73 

This argument fails for two reasons. First, it misrepresents the theory of intelligent design. The theory of intelligent design does not claim to detect a supernatural intelligence possessing unlimited powers. Though the designing agent responsible for life may well have been an omnipotent deity, the theory of intelligent design does not claim to be able to determine that. Because the inference to design depends upon our uniform experience of cause and effect in this world, the theory cannot determine whether or not the designing intelligence putatively responsible for life has powers beyond those on display in our experience. Nor can the theory of intelligent design determine whether the intelligent agent responsible for information in life acted from the natural or the “supernatural” realm. Instead, the theory of intelligent design merely claims to detect the action of some intelligent cause (with power, at least, equivalent to those we know from experience) and affirms this because we know from experience that only conscious, intelligent agents produce large amounts of specified information. The theory of intelligent design does not claim to be able to determine the identity or any other attributes of that intelligence, even if philosophical deliberation or additional evidence from other disciplines may provide reasons to consider, for example, a specifically theistic design hypothesis.74 

Pennock’s argument also fails because the theory of intelligent design is subject to empirical testing and refutation. Indeed, intelligent design actually makes a much stronger claim than the caricature of it he critiqued during the trial. Pennock critiques the hypothesis that “an omnipotent deity could explain the origin of life.” But the theory of intelligent design actually advocated differs from that hypothesis since it does not merely affirm that intelligence constitutes a possible explanation of certain features of life. Instead, it asserts that intelligent design constitutes the best explanation of a particular feature of life because of what we know about the cause-and-effect structure of the world — specifically, because of what we know about what it takes to produce large amounts of specified information. For this reason, the design hypothesis is not “compatible with any conceivable data” or observations whatsoever. 

If it were shown, for example, that the cause-and-effect structure of the world were different than what advocates of intelligent design claim — if, for example, someone successfully demonstrated that “large amounts of functionally specified information do arise from purely chemical and physical antecedents,” then my design hypothesis, with its strong claim to be the best (clearly superior) explanation of such phenomena, would fail. Intelligent design would remain as a merely possible explanation (much as chance does now). But the claim that intelligent design provides the best (most causally adequate) explanation for the origin of biological information would be refuted. Similarly, if it could be shown that key indicators of intelligence — such as specified information — were not present in living systems, the basis of the design hypothesis in its present strong form would evaporate. Thus, Pennock and Miller incorrectly portray the theory of intelligent design as being consistent with any empirical situation. The theory of intelligent design is, in fact, testable — just as we have argued. 

3.5 Testability and Predictability 

When critics of intelligent design are confronted with refutations of a particular demarcation argument, they typically shift their ground and formulate other arguments either by invoking a different demarcation criterion or by applying the original criterion in a more demanding way. For example, after explaining how intelligent design can be tested and how it does make certain kinds of predictions, I commonly hear the objection that the theory of intelligent design is not scientific because it cannot make other kinds of predictions. Critics correctly point out, for example, that we cannot predict with complete accuracy what intelligent agents will do since, presumably, intelligent agents possess the capacity to act of their own free volition. Since ID invokes the action of an unpredictable intelligent agent, and since scientific theories must make predictions, theories invoking the activity of intelligent agents are not scientific — or so the argument goes. 

Yet standard materialistic theories of evolution (whether chemical or biological) do not make predictions of this kind either. Specifically, evolutionary theory does not make predictions about the future course of evolution. It makes no prediction about the kind of traits or species that random mutations and natural selection will produce in the future. As Ken Miller notes, “The outcome of evolution is not predictable.”75 Even so, most evolutionary biologists think that these theories are scientific—and for good (if convention-dependent) reasons. Evolutionary theories provide explanations of past events and present evidence, and they make predictions about the patterns of evidence that scientists should find in their future investigations, for example, of the genome or the fossil record. 

In the same way, the theory of intelligent design does not make predictions about when (or whether) the designing intelligence responsible for life will act in the future. Yet it does explain past events and present evidence, and it also makes discriminating predictions about the kind of evidence scientists should find in their future investigations.76 Thus, neither type of origins theory qualifies as scientific if the “ability to generate predictions” is treated as a condition of scientific status and interpreted in a strict way, though both types of theories qualify as scientific if this criterion is equated with scientific status and interpreted in a more flexible way. As I studied the various demarcation arguments against intelligent design, I repeatedly found this same pattern. Invariably, the criteria that supposedly showed that intelligent design is inherently unscientific either disqualified both intelligent design and its materialistic rivals, or if the criteria were applied more flexibly, legitimated both types of theories — provided, that is, that the criteria were not applied in a question-begging way. Again, what was sauce for the goose was sauce for the gander.

As this pattern became more pronounced with each of the definitional criteria examined, I became more convinced that there was no good reason to exclude intelligent design from consideration as a scientific explanation for the origin of biological information. Since — by convention — materialistic theories of biological origin were considered scientific, and since the theory of intelligent design met various criteria of scientific status just as well as these rival theories, it seemed clear that the theory of intelligent design, by the same conventions, must be considered scientific as well. 

Consider the case of so-called junk DNA — the DNA that does not code for proteins found in the genomes of both one-celled organisms and multicellular plants and animals. The theory of intelligent design and materialistic evolutionary theories (both chemical and biological) differ in their interpretation of so-called junk DNA. Since neo-Darwinism holds that new biological information arises as the result of a process of mutational trial and error, it predicts that nonfunctional DNA would tend to accumulate in the genomes of eukaryotic organisms (organisms whose cells contain nuclei). Since most chemical evolutionary theories also envision some role for chance interactions in the origin of biological information, they imply that non-functional DNA similarly would have accumulated in the first simple (prokaryotic) organisms — as a kind of remnant of whatever undirected process first produced functional information in the cell. For this reason, most evolutionary biologists concluded upon the discovery of non-protein-coding DNA that such DNA was “junk.” In their view, discovery of the non-protein-coding regions confirmed the prediction or expectation of naturalistic evolutionary theories and disconfirmed an implicit prediction of intelligent design. 

As Michael Shermer argues, “Rather than being intelligently designed, the human genome looks more and more like a mosaic of mutations, fragmented copies, borrowed sequences, and discarded strings of DNA that were jerry-built over millions of years of evolution.”77 Or as Ken Miller argues: “The critics of evolution like to say that the complexity of the genome makes it clear that it was designed. … But there’s a problem with that analysis, and it’s a serious one. The problem is the genome itself: it’s not perfect. In fact, it’s riddled with useless information, mistakes, and broken genes. … Molecular biologists actually call some of these regions ‘gene deserts,’ reflecting their barren nature.”78 Or as philosopher of science Philip Kitcher puts it, “If you were designing the genomes of organisms, you would not fill them up with junk.”79 

ID advocates advance a different view of non-protein-coding DNA.80 The theory of intelligent design predicts that most of the non-protein-coding sequences in the genome should perform some biological function, even if they do not direct protein synthesis. ID theorists do not deny that mutational processes might have degraded or “broken” some previously functional DNA, but we predict that the functional DNA (the signal) should dwarf the nonfunctional DNA (the noise), and not the reverse. As William Dembski explained and predicted in 1998: “On an evolutionary view we expect a lot of useless DNA. If, on the other hand, organisms are designed, we expect DNA, as much as possible, to exhibit function.”81 The discovery in recent years that non-protein-coding DNA performs a diversity of important biological functions has confirmed this prediction. It also decisively refutes prominent critics of intelligent design—including Shermer, Miller, and Kitcher — who have continued to argue (each as recently as 2008) that the genome is composed of mostly useless DNA.82 

Contrary to their claims, recent scientific discoveries have shown that the non-protein-coding regions of the genome direct the production of RNA molecules that regulate the use of the protein-coding regions of DNA. Cell and genome biologists have also discovered that these supposedly “useless” non-protein-coding regions of the genome: (1) regulate DNA replication,83 (2) regulate transcription,84 (3) mark sites for programmed rearrangements of genetic material,85 (4) influence the proper folding and maintenance of chromosomes,86 (5) control the interactions of chromosomes with the nuclear membrane (and matrix),87 (6) control RNA processing, editing, and splicing,88 (7) modulate translation,89 (8) regulate embryological development,90 (9) repair DNA,91 and (10) aid in immunodefense or fighting disease92 among other functions. In some cases, “junk” DNA has even been found to code functional genes.93 Overall, the non-proteincoding regions of the genome function much like an operating system in a computer that can direct multiple operations simultaneously.94 Indeed, far from being “junk,” as materialistic theories of evolution assumed, the non-protein-coding DNA directs the use of other information in the genome, just as an operating system directs the use of the information contained in various application programs stored in a computer. In any case, contrary to the often-heard criticism that the theory makes no predictions, intelligent design not only makes a discriminating prediction about the nature of “junk DNA,” recent discoveries about non-protein-coding DNA also confirm the prediction that it makes.95 In the appendix to my book, Signature in the Cell, I describe several other discriminating predictions that the theory of intelligent design makes.96 Despite this, many continue to assert the falsehood that ID is not testable. 

4. Methodological Naturalism, or How Dover Was Decided 

In light of the preceding discussion about the specific failure of demarcation arguments, how is it that a federal court in 2005 was able to determine that ID is not science? By what definition did the judge in the now famous Kitzmiller vs. Dover case use to make this determination? 

As it turned out, Judge Jones did a clever thing. He didn’t reject intelligent design as science because it failed to meet a neutral definition of science or some methodological norm. At the urging of the ACLU, he circumvented the whole demarcation problem by defining science as the exclusion of intelligent design — only he didn’t call it that. Instead, following the ACLU’s expert witnesses and brief, he called the exclusionary principle “methodological naturalism.”97 He then equated science with adherence to that principle and rejected intelligent design because it violated it. 

But what is the principle of methodological naturalism? Methodological naturalism asserts that to qualify as scientific, a theory must explain all phenomena by reference to purely material — that is, nonintelligent — causes. As philosopher Nancey Murphy explains, methodological naturalism forbids reference “to creative intelligence” in scientific theories.98 

So, did the judge find a demarcation criterion or methodological norm that could discriminate between intelligent design and materialistic theories of evolution? Clearly, he did. If science is defined as Judge Jones defined it, intelligent design does not qualify as a scientific theory. But should science be defined that way? Did the judge offer a good reason for excluding intelligent design from consideration as science? 

He did not. Instead, he provided an entirely arbitrary, circular, and question-begging justification for the exclusion of design. I knew, as did many other philosophers of science, that demarcation arguments based upon neutral methodological norms such as testability could not justify a prohibition against intelligent causes in science. The judge in the Dover case supposedly offered a reason for this prohibition, but his reason turned out to be just a restatement of the prohibition by another name. According to Judge Jones, the theory of intelligent design cannot be part of science because it violates the principle of methodological naturalism. But that principle turns out to be nothing more than the claim that intelligent causes — and thus the theory of intelligent design — must be excluded from science.99 According to this reasoning, intelligent design isn’t science because it violates the principle of methodological naturalism. And what is methodological naturalism? It is a rule prohibiting consideration of intelligent design within science. 

Thus, despite appearances to the contrary, Judge Jones did not offer a good reason — a theoretically neutral norm or definition of science — by which to justify the exclusion of intelligent design from science. Instead, he simply asserted a prohibition against the consideration of intelligent design, invoked the same prohibition by another name, and then treated it as if it were a reason — a methodological principle — justifying the prohibition itself. 

Fortunately we don’t look to federal judges to settle great questions of scientific and philosophical import. Did life arise as the result of purely undirected material causes or did intelligence play a role?100 Surely a court-promulgated definition of science, especially one so logically problematic as methodological naturalism, does not answer that question.101

No doubt Judge Jones felt justified in offering such a thin and circular justification for his definition of science because he knew many scientists agreed with him. And, indeed, the majority of scientists may well accept the principle of methodological naturalism. So, if science is what scientists do, and if many or most scientists do not think that hypotheses invoking intelligent causes have a place in their theories, then perhaps intelligent design doesn’t qualify as a scientific theory after all. According to this line of thinking, Judge Jones did not impose an arbitrary definition of science. Instead, his ruling merely expressed a preexisting consensus about proper scientific practice from within the scientific community. As the judge himself wrote in the ruling, methodological naturalism is simply a “centuries-old ground rule” of science.102 

So why shouldn’t scientists continue to accept methodological naturalism as a strict rule governing scientific practice? Maybe we should just accept this convention and move on. Of course, some scientists may decide to do exactly that. But if they do, it’s important to recognize what that decision would and would not signify about the design hypothesis. Scientists who decide to define explanations involving creative intelligence as unscientific cannot then treat the failure of such hypotheses to meet their definition of science as a tacit refutation of, or reason to reject, such hypotheses. Why? It remains logically possible that an “unscientific” hypothesis (by the criterion of methodological naturalism) might constitute a better explanation of the evidence than the currently best “scientific” hypothesis. In light of the evidence discussed in this essay and presented in my book Signature in the Cell, I would contend that, whatever its classification, the design hypothesis provides a better explanation than any of its materialistic rivals for the origin of the specified information necessary to produce the first life. Reclassifying an argument does not refute it. 

In any case, there is no compelling reason for the currently dominant convention among scientists to continue. Conventions are just that. Without a good reason for holding them, they may do nothing more than express an unexamined prejudice and block the path of inquiry. When good reasons for rejecting conventions come along, reasonable people will set them aside — and there are now good reasons to set this convention aside. 

First, scientists have not always restricted themselves to naturalistic hypotheses, contrary to the claims of one of the expert witnesses in the Dover trial. Newton, for example, made design arguments within his scientific works, most notably in the Principia and in the Opticks. Louis Agassiz, a distinguished paleontologist and contemporary of Darwin, also made design arguments within his scientific works, insisting that the pattern of appearance in the fossil record strongly suggested “an act of mind.” Defenders of methodological naturalism can claim, at best, that it has had normative force during some periods of scientific history. But this concedes that canons of scientific method change over time — as, indeed, they do. From Newton until Darwin, design arguments were a common feature of scientific research. After Darwin, more materialistic canons of method came to predominate. Recently, however, this has begun to change as more scientists are becoming interested in the evidence for intelligent design. 

Second, many scientific fields currently posit intelligent causes as scientific explanations. Design detection is already part of science. Archaeologists, anthropologists, forensic scientists, cryptographers, and others now routinely infer intelligent causes from the presence of information-rich patterns or structures or artifacts. Furthermore, astrobiologists looking for extraterrestrial intelligence (SETI) do not have a rule against inferring an intelligent cause. Instead, they are open to detecting intelligence, but have not had evidence to justify making such an inference. Thus, the claim that all scientific fields categorically exclude reference to creative intelligence is actually false. 

Even some biologists now contest methodological naturalism. Granted, many evolutionary biologists accept methodological naturalism as normative within their discipline. Nevertheless, biologists intrigued by the design hypothesis reject methodological naturalism because it prevents them from considering a possibly true hypothesis. Indeed, a central aspect of the current debate over design is precisely about whether methodological naturalism should be regarded as normative for biology today. Most evolutionary biologists say it should remain normative; scientists advocating intelligent design disagree. But critics of intelligent design cannot invoke methodological naturalism to settle this debate about the scientific status of intelligent design, because methodological naturalism is itself part of what the debate is about. 

Third, defining science as a strictly materialistic enterprise commits scientists to an unjustified — and possibly false — view of biological origins. It is at least logically possible that a personal agent — a conscious goal-directed intelligence—existed before the appearance of the first life on Earth. Moreover, as evidenced by the work of William Dembski and Robert Marks, or by our explanation of how intelligent design functions as a historical science using the method of multiple competing hypotheses, there are now rigorous scientific methods by which the activity of intelligent agents can be inferred or detected from certain kinds of effects. Thus, if a personal agent existed before the advent of life on Earth, then it is also at least possible that the activity of such an agent could be detected using one of these methods. In light of this, prohibitions against the design hypothesis in investigations of the origin of life amount to an assumption that no intelligence of any kind existed or could have acted prior to that event. But this assumption is entirely unjustified, especially given the absence of evidence for a completely materialistic account of abiogenesis. 

Finally, allowing methodological naturalism to function as an absolute “ground rule” of method for all of science would have a deleterious effect on the practice of certain scientific disciplines, especially the historical sciences.103 In origin of life research, for example, methodological naturalism artificially restricts inquiry and prevents scientists from exploring and examining some hypotheses that might provide the most likely, best, or causally adequate explanations. To be a truth-seeking endeavor, the question that origin of life research must address is not, “Which materialistic scenario seems most adequate?” but rather, “What actually caused life to arise on Earth?” Clearly, one possible answer to that latter question is this: “Life was designed by an intelligent agent that existed before the advent of humans.” If one accepts methodological naturalism as normative, however, scientists may never consider this possibly true hypothesis. Such an exclusionary logic diminishes the significance of claiming theoretical superiority for any remaining hypothesis and raises the possibility that the best “scientific” explanation (by the lights of methodological naturalism) may not, all things considered, be the best explanation at all. 

Scientific theory evaluation is an inherently comparative enterprise. Theories that gain acceptance in artificially constrained competitions can claim to be neither “best” nor “most probably true.” At most such theories can be considered “the best, or most probably true, among an artificially limited set of options.” Openness to the design hypothesis would seem necessary, therefore, to any fully rational historical biology — that is, to one that seeks the truth, “no holds barred.”104 A historical biology committed to following the evidence wherever it leads will not exclude hypotheses a priori because of their possible metaphysical implications. Instead, it will employ only metaphysically neutral criteria — such as causal adequacy — to evaluate competing hypotheses. Yet this more open (and arguably rational) approach would now seem to affirm the theory of intelligent design as the best, most causally adequate, scientific explanation for the origin of the information necessary to build the first living organism.105 


  1. Jones, Kitzmiller et al. v. Dover Area School District, 400 F.Supp.2d 707, 720–21, 735 (M. D. Pa. 2005).
  2. Jones, Kitzmiller et al. v. Dover Area School District, 400 F.Supp.2d 707, 764 (M. D. Pa. 2005).
  3. Prominent news reports include Claudia Wallis, “The Evolution Wars,” Time, August 7, 2005; Evan Ratliff, “The Crusade Against Evolution,” Wired, October 2004; and Jodi Wilgoren, “Politicized Scholars Put Evolution on the Defensive,” New York Times, August 21, 2005. 
  4. Judge Jones falsely claimed that: (1) the theory of intelligent design affirms a “supernatural creation”— a position that ID proponents who testified in court denied during the trial; (2) proponents of intelligent design make their case solely by arguing against Darwinian evolution; (3) no peer-reviewed scientific publications in support of the theory of intelligent design have been published in the scientific literature; and (4) the theory of intelligent design has been refuted. See DeWolf, et al., Traipsing into Evolution; DeWolf, West, and Luskin, “Intelligent Design Will Survive Kitzmiller v. Dover”; Luskin, “Will Americans United Retract Their Demonstrably False Claims?” 
  5. See Worden, “Bad Frog Beer to ‘Intelligent Design.’”
  6. See West and DeWolf, “A Comparison of Judge Jones’s Opinion in Kitzmiller v. Dover with Plaintiffs’ Proposed ‘Findings of Fact and Conclusions of Law.’”
  7. There are numerous examples of this claim. Some include: “The claim that life is the result of a design created by an intelligent cause cannot be tested and is not within the realm of science” (Skoog, “A View from the Past,” 1–2); “ID has never produced an empirically testable hypothesis” (Forrest and Gross, Creationism’s Trojan Horse, 235); “The hypothesis of design is compatible with any conceivable data, makes no testable predictions, and suggests no new avenues for research” (Miller, Only a Theory, 87). For examples of some testable predictions made by intelligent design theory, see the appendix to my book Signature in the Cell (2009).
  8. “There is no demarcation line between science and non-science, or between science and pseudoscience, which would win assent from a majority of philosophers” (Laudan, Beyond Positivism and Relativism, 210).
  9. Laudan, “The Demise of the Demarcation Problem.”
  10. Gould, “Evolution and the Triumph of Homology, or Why History Matters,” 60–69.
  11. For example, Pennock testified, “Intelligent design needs to have for it to be a science a way of offering a specific hypothesis that one could test in an ordinary way. They failed to do that, and so they really don’t get off the ground with regard to science” (Kitzmiller v. Dover testimony, September 28, 2005, 39).
  12. See my book, Signature in the Cell: DNA and the Evidence for Intelligent Design (San Francisco: HarperOne, 2009).
  13. Behe, Darwin’s Black Box.
  14. Meyer, et al., “The Cambrian Explosion.”
  15. See the essays by William Craig and Bruce Gordon in this volume; also Robin Collins’ essay “Evidence for Fine-Tuning,” in Neil Manson, ed. God and Design: The Teleological Argument and Modern Science. New York: Routledge, 2003, 178–99.
  16. See the essay by Guillermo Gonzalez in this volume; also Gonzalez and Richards, The Privileged Planet.
  17. See Nelson and Wells, “Homology in Biology.”
  18. Dembski, The Design Inference, 36.
  19. Dembski, The Design Inference, 36–66. See also Dembski’s article “Specification: The Pattern that Signifies Intelligence” ( for a more recent and nuanced treatment.
  20. See Dembski’s and Marks’ essay “Life’s Conservation Law: Why Darwinian Evolution Cannot Create Biological Information” in Part III of this volume.
  21. Considerations of causal existence also play a role in the evaluation — and testing — of historical scientific theories. Indeed, historical scientific theories can fail by being unable to meet this critical test as well.
  22. We discuss a number of such predictions below; see also the appendix to my book Signature in the Cell (2009). 
  23. Though historical scientists focus primarily on questions about the past, they clearly also have a secondary interest in questions about the present operation and cause-and-effect structure of the world. Indeed, the uniformitarian method requires that historical scientists use knowledge of the present cause-and-effect structure of the world to reconstruct what happened in the past. Nevertheless, that the historical sciences address questions about the past at all distinguishes them from many sciences that focus wholly on questions about how nature generally operates. 
  24. Gould, “Evolution and the Triumph of Homology,” 61.
  25. Meyer, “DNA and the Origin of Life”; Meyer, et al., “The Cambrian Explosion”; Behe, Darwin’s Black Box; Gonzalez and Richards, The Privileged Planet; Craig, “Barrow and Tipler on the Anthropic Principle vs. Divine Design,” 389.
  26. This is not to deny that laws or process theories may play roles in support of causal explanation, as even opponents of the covering-law model, such as Scriven, admit. Scriven notes that laws and other types of general-process theories may play an important role in justifying the causal status of an explanatory antecedent and may provide the means of inferring plausible causal antecedents from observed consequents. Nevertheless, as both Scriven and I have argued elsewhere, laws are not necessary to the explanation of particular events or facts; and even when laws are present, antecedent events function as the primary causal or explanatory entity in historical explanations. See Scriven, “Truisms as the Grounds,” 448–50; “Explanation and Prediction,” 480; “Causes, Connections and Conditions,” 249–50; Meyer, “Of Clues and Causes,” 18–24, 36–72, 84–92.
  27. Dawkins, The Blind Watchmaker, 1.
  28. Ayala, “Darwin’s Revolution.”
  29. Nagel, “Public Education and Intelligent Design.”
  30. For example, Judge Jones asserted in his decision: “We find that ID is not science and cannot be adjudged a valid, accepted scientific theory as it has failed to publish in peer-reviewed journals” (Kitzmiller et al. v. Dover Area School District, 400 F.Supp.2d).
  31. Forrest, quoted in Vergano and Toppo, “‘Call to Arms’ on Evolution.”
  32. Forrest, Expert Witness Report.
  33. For example, Judge Jones asserted: (1) “We find that ID is not science and cannot be adjudged a valid, accepted scientific theory as it has failed to publish in peer-reviewed journals, engage in research and testing, and gain acceptance in the scientific community”; (2) “A final indicator of how ID has failed to demonstrate scientific warrant is the complete absence of peer-reviewed publications supporting the theory”; and (3) “The evidence presented in this case demonstrates that ID is not supported by any peer-reviewed research, data or publications” (Kitzmiller et al. v. Dover Area School District, 400 F.Supp.2d).
  34. Holden, “Random Samples”; Giles, “Peer-Reviewed Paper Defends Theory of Intelligent Design”; Klinghoffer, “The Branding of a Heretic”; Powell, “Editor Explains Reasons for ‘Intelligent Design’ Article.”
  35. See Discovery Institute, Brief of Amicus Curiae (Revised).
  36. E.g., Behe, Darwin’s Black Box; Gonzalez and Richards, The Privileged Planet; Thaxton, Bradley, and Olsen, The Mystery of Life’s Origin.
  37. E.g., Dembski, The Design Inference; Campbell and Meyer, eds., Darwinism, Design and Public Education; Dembski and Ruse, eds., Debating Design.
  38. See the five articles advancing the case for the theory of intelligent design published in Campbell and Meyer, eds., Darwinism, Design and Public Education, and the four articles published in Dembski and Ruse, eds., Debating Design.
  39. Minnich and Meyer, “Genetic Analysis of Coordinate Flagellar and Type III Regulatory Circuits”; Dembski, ed., Mere Creation.
  40. Craig, “God, Creation and Mr. Davies,” 163; “Barrow and Tipler on the Anthropic Principle vs. Divine Design”; Behe, “Self-Organization and Irreducibly Complex Systems.” 
  41. Wells, “Do Centrioles Generate a Polar Ejection Force?”; Behe and Snoke, “Simulating Evolution by Gene Duplication”; Dembski and Marks, “The Conservation of Information: Measuring the Information Cost of a Successful Search”; Voie, “Biological Function and the Genetic Code Are Interdependent”; Davison, “A Prescribed Evolutionary Hypothesis.” See also Lönnig and Saedler, “Chromosomal Rearrangements and Transposable Elements.”
  42. In 2005 my colleagues and I at the Discovery Institute actually opposed the policy of the Dover school board and urged the school board to withdraw it. Though we think there is nothing unconstitutional about teaching students about the theory of intelligent design, we feared that politicizing the issue would result in reprisals against ID proponents in university science departments. We also objected to the way some members of the Dover board attempted to justify their policy by invoking religious authority as a reason to vote for the policy. This justification guaranteed the policy would run afoul the establishment clause in the courts. From our point of view, this justification was entirely gratuitous—and incongruous—since the theory of intelligent design is not based upon a religious authority, but upon empirical evidence and standard scientific methods of reasoning. Unfortunately, the school board did not heed our advice. It lost the case, just as we predicted, ultimately causing trouble for ID proponents at universities around the country, just as we, alas, also predicted.
  43. “The Council [of the Biological Society of Washington, which oversees the publication of the Proceedings of the Biological Society of Washington] endorses a resolution on ID published by the American Association for the Advancement of Science (, which observes that there is no credible scientific evidence supporting ID as a testable hypothesis to explain the origin of organic diversity. Accordingly, the Meyer paper does not meet the scientific standards of the Proceedings.” See http://www. 
  44. These charges were clearly misplaced. The president of the council that oversaw the publication of the Proceedings admitted to the editor in an e-mail: “I have seen the review file and comments from 3 reviewers on the Meyer paper. All three with some differences among the comments recommended or suggested publication. I was surprised but concluded that there was not inappropriate behavior vs a vis [sic] the review process” (Roy McDiarmid, “Re: Request for information,” January 28, 2005, 2:25 p.m., to Hans Sues, Congressional Staff Report, “Intolerance and the Politicization of Science at the Smithsonian” [December 2006]: 26, at filesDB-download.php?command=download&id=1489). See also Rick Sternberg, “Statement of Facts/Response to Misinformation,” at smithsonian.php?page=statement.
  45. As Stephen Jay Gould wrote with other scientists and historians of science in a brief to the U.S. Supreme Court in 1993: “Judgments based on scientific evidence, whether made in a laboratory or a courtroom, are undermined by a categorical refusal even to consider research or views that contradict someone’s notion of the prevailing ‘consensus’ of scientific opinion. . . . Automatically rejecting dissenting views that challenge the conventional wisdom is a dangerous fallacy, for almost every generally accepted view was once deemed eccentric or heretical. Perpetuating the reign of a supposed scientific orthodoxy in this way, whether in a research laboratory or in a courtroom, is profoundly inimical to the search for truth. . . . The quality of a scientific approach or opinion depends on the strength of its factual premises and on the depth and consistency of its reasoning, not on its appearance in a particular journal or on its popularity among other scientists.” Brief Amici Curiae of Physicians, Scientists, and Historians of Science in Support of Petitioners, Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993).
  46. For a comprehensive annotated bibliography of ID publications, see Some critics of design have attempted to discredit the theory because its advocates have published their case primarily in books rather than in scientific articles. But this argument ignores the important role that books have played in the history of science in establishing new scientific ideas. Anyone who understands the role that technical journals play in science will understand why this is so. Science journals are a highly specialized and conservative genre. They publish research designed to fill out an established scientific research program. They are part of what philosopher of science Thomas Kuhn calls “normal science” (The Structure of Scientific Revolutions). New and revolutionary ideas in science are unlikely to appear first in their pages. If the history of science is any indication, then we should expect most of the initial work in any fundamentally new scientific perspective to appear first in books. And this is precisely the pattern of publication we see in the case of intelligent design. In the last decade or so, new evidence-based arguments for the theory have made their initial appearance in books. More recently, scientific articles have begun to appear, elucidating the theory in more detail.
  47. Ruse, “Darwinism,” 21.
  48. Ruse, “Darwinism,” 23.
  49. Ruse, “A Philosopher’s Day in Court”; “Witness Testimony Sheet,” 301; “Darwinism,” 21–26.
  50. Meyer, “Laws, Causes and Facts.”
  51. A law of nature typically describes a general relationship between two or more different types of events, entities, or properties. Many have the form, “If A occurs, then B will always follow under conditions C,” such as the laws, “Pure water at sea level heated to 100 degrees C will boil” and “All unsuspended bodies will fall.” Other laws describe mathematical relationships between different entities or properties that apply universally, such as the law, “Force equals mass times acceleration,” or the law, “The pressure of a gas is proportional to its volume times its temperature.” In any case, laws are not events; they describe relationships (causal, logical, or mathematical) between different types of events, entities, or properties.
  52. Scriven, “Causation as Explanation,” 14; Lipton, Inference to the Best Explanation, 47–81.
  53. In the On the Origin of Species, Darwin proposed both a mechanism (natural selection) and a historical theory—the theory of universal common descent. Evolutionary biologists debate whether natural selection can be formulated as a law. But within Darwin’s argument, the theory of common descent had its own explanatory power. Yet it did not explain by reference to a law of nature. Instead, the theory of common descent explains by postulating a hypothetical pattern of events (as depicted in Darwin’s famous tree of life). The theory of common descent makes a claim about what happened in the past—namely, that a series of unobserved transitional organisms existed, forming a genealogical bridge between presently existing life-forms—to account for a variety of presently observed evidence (such as the similarity of anatomical structures in different organisms or the pattern of fossil progression). Darwin himself referred to common descent as the vera causa (i.e., the actual cause) of a diverse set of biological observations (On the Origin of Species, 195, 481–82). And in the theory of common descent, a pattern of events, not a law, does what I call the “primary explanatory work.”
  54. See Dembski’s and Marks’ essay in this volume.
  55. Ruse, Darwinism Defended, 59.
  56. Grinnell, “Radical Intersubjectivity”; Scott, “Keep Science Free from Creationism.”
  57. Miller, Only a Theory, 87; Skoog, “View from the Past”; Sober, “What Is Wrong with Intelligent Design?”
  58. Ruse, “Darwinism.”
  59. Miller, Only a Theory, 87.
  60. Kitzmiller v. Dover School District 04 cv 2688 (December 20, 2005), 22, 77; Riordan, “Stringing Physics Along,” 38.
  61. Kitzmiller v. Dover School District 04 cv 2688 (December 20, 2005), 81; Jack Krebs, “A Summary of Objections to ‘Intelligent Design,’” Kansas Citizens for Science, June 30, 2001 (http://www.sunflower. com/~jkrebs/ JCCC/04%20Summary_Objections.html).
  62. Michigan Science Teachers Association, “Evolution Education and the Nature of Science,” February 3, 2007 (–02–03.doc).
  63. See and, specifically, “The Scientific Status of Intelligent Design: The Methodological Equivalence of Naturalistic and Non-Naturalistic Origins Theories” and “The Demarcation of Science and Religion.” See also Philip Kitcher’s book, Living with Darwin, 9–14. Kitcher is a leading philosopher of science who rejects intelligent design, but thinks that the attempts to refute it using demarcation arguments fail. Kitcher argues that the problem with intelligent design is not that it isn’t scientific, but that it is “discarded” or “dead science.” He argues this largely because he thinks that intelligent design cannot explain the accumulation of “junk DNA.” He does not, however, address the empirical argument for intelligent design based upon the information-bearing properties of DNA or the evidence showing that nonprotein-coding DNA plays a crucial functional role in the cell.
  64. Meyer, “A Scopes Trial for the ’90s”; “Open Debate on Life’s Origin.”
  65. Scott, “Keep Science Free from Creationism.”
  66. Grinnell, “Radical Intersubjectivity.”
  67. Meyer, “Of Clues and Causes,” 120; Darwin, On the Origin of Species, 398; Hull, Darwin and His Critics, 45. 
  68. Oddly, some of these same people also claim that the theory has been tested and found wanting. For example, in 1999 the U.S. National Academy of Sciences (NAS) issued a statement against intelligent design that claimed that ID is “not science because [it is] not testable by the methods of science.” Yet the NAS simultaneously stated, “Molecular data counter a recent proposition called ‘intelligent design theory’” and asserted that “scientists have considered the hypotheses” of intelligent design and “rejected them because of a lack of evidence.” National Academy of Sciences, Science and Creationism, 21, ix. Similarly, Gerald Skoog argues that “the claim that life is the result of a design created by an intelligent cause cannot be tested and is not within the realm of science.” Then in the next paragraph he states, “Observations of the natural world also make these dicta [concerning the theory of intelligent design] suspect” (“View from the Past”). Clearly something cannot be both untestable in principle and rendered suspect by empirical observations. 
  69. Pennock, Expert Witness Report. Emphasis added.
  70. Scott, “Keep Science Free from Creationism.”
  71. Judson, The Eighth Day of Creation, 157–90.
  72. Francis Darwin, ed., Life and Letters, 1: 437, emphasis added.
  73. Miller, Only a Theory, 87. 
  74. Meyer, “The Return of the God Hypothesis.”
  75. Miller, Finding Darwin’s God, 238.
  76. For an extensive list of such predictions, see Appendix A in my book Signature in the Cell (2009). Note too that neither type of theory describes events that will necessarily occur repeatedly, but both use uniform and repeated experience of cause and effect to make inferences about the most likely cause of various singular happenings.
  77. Shermer, Why Darwin Matters, 75.
  78. Shermer, Why Darwin Matters, 75.
  79. See also Kitcher, Living with Darwin, 57.
  80. Some advocates of intelligent design think that an intelligent cause is directly responsible for only the information present in the first living organisms; other ID advocates think intelligent design is responsible for the information necessary to produce subsequent forms of life as well. Those who hold the latter view predict that the non-protein-coding DNA in both eukaryotes and prokaryotes should perform functional roles. Those who hold the former view predict that only the noncoding DNA in prokaryotes should perform functional roles. The discovery that noncoding DNA plays an important functional role in both prokaryotic and eukaryotic organisms confirms the prediction of the more expansive ID hypothesis. I hold this latter view. See Meyer, “The Origin of Biological Information.” In this essay and in my book Signature in the Cell, however, I have argued only for intelligent design as the best explanation of the origin of the information necessary to build the first living cell. 
  81. 81. Dembski, “Intelligent Science and Design.” Here’s what Dembski writes about junk DNA: “[Intelligent] design is not a science stopper. Indeed, design can foster inquiry where traditional evolutionary approaches obstruct it. Consider the term ‘junk DNA.’ Implicit in this term is the view that because the genome of an organism has been cobbled together through a long, undirected evolutionary process, the genome is a patchwork of which only limited portions are essential to the organism. Thus on an evolutionary view we expect a lot of useless DNA. If, on the other hand, organisms are designed, we expect DNA, as much as possible, to exhibit function.” 
  82. ENCODE Project Consortium, “Identification and Analysis of Functional Elements.”
  83. Von Sternberg and Shapiro, “How Repeated Retroelements Format Genome Function.”
  84. Han, Szak, and Boeke, “Transcriptional Disruption by the L1 Retrotransposon”; Bethany Janowski, et al., “Inhibiting Gene Expression at Transcription Start Sites”; Goodrich and Kugel, “Non-codingRNA Regulators of RNA Polymerase II Transcription”; Li, et al., “Small dsRNAs Induce Transcriptional Activation in Human Cells”; Pagano, et al., “New Small Nuclear RNA Gene-like Transcriptional Units”; Van de Lagemaat, et al., “Transposable Elements in Mammals”; Donnelly, Hawkins, and Moss, “A Conserved Nuclear Element”; Dunn, Medstrand, and Mager, “An Endogenous Retroviral Long Terminal Repeat”; Burgess-Beusse, et al., “The Insulation of Genes”; Medstrand, Landry, and Mager, “Long Terminal Repeats Are Used as Alternative Promoters”; Mariño-Ramírez, et al., “Transposable Elements Donate LineageSpecific Regulatory Sequences to Host Genomes.”
  85. Green, “The Role of Translocation and Selection”; Figueiredo, et al., “A Central Role for Plasmodium Falciparum Subtelomeric Regions.”
  86. Henikoff, Ahmad, and Malik, “The Centromere Paradox”; Bell, West, and Felsenfeld, “Insulators and Boundaries”; Pardue and DeBaryshe, “Drosophila Telomeres”; Henikoff, “Heterochromatin Function in Complex Genomes”; Figueiredo, et al., “A Central Role for Plasmodium Falciparum”; Schueler, et al., “Genomic and Genetic Definition of a Functional Human Centromere.”
  87. Jordan, et al., “Origin of a Substantial Fraction”; Henikoff, Ahmad, and Malik, “The Centromere Paradox”; Schueler, et al., “Genomic and Genetic Definition of a Functional Human Centromere.”
  88. Chen, DeCerbo, and Carmichael, “Alu Element-Mediated Gene Silencing”; Jurka, “Evolutionary Impact of Human Alu Repetitive Elements.”; Lev-Maor, et al., “The Birth of an Alternatively Spliced Exon”; KondoIida, et al., “Novel Mutations and Genotype–Phenotype Relationships”; Mattick and Makunin, “Non-coding RNA.”
  89. McKenzie and Brennan, “The Two Small Introns of the Drosophila Affinidisjuncta Adh Gene”; Arnaud, et al., “SINE Retroposons Can Be Used In Vivo”; Rubin, Kimura, and Schmid, “Selective Stimulation of Translational Expression”; Bartel, “MicroRNAs”; Mattick and Makunin, “Small Regulatory RNAs in Mammals.”
  90. Dunlap, et al., “Endogenous Retroviruses”; Hyslop, et al., “Downregulation of NANOG Induces Differentiation”; Peaston, et al., “Retrotransposons Regulate Host Genes.”
  91. Morrish, et al., “DNA Repair Mediated”; Tremblay, Jasin, and Chartrand, “A Double-Strand Break in a Chromosomal LINE Element”; Grawunder, et al. “Activity of DNA Ligase IV”; Wilson, Grawunder, and Liebe, “Yeast DNA Ligase IV.”
  92. Mura, et al., “Late Viral Interference Induced”; Kandouz, et al., “Connexin43 Pseudogene Is Expressed.”
  93. Goh, et al., “A Newly Discovered Human Alpha Globin Gene”; Kandouz, et al., “Connexin43 Pseudogene Is Expressed”; Tam, et al., “Pseudogene-Derived Small Interfering RNAs”; Watanabe, et al., “Endogenous siRNAs from Naturally Formed dsRNAs”; Piehler, et al., “The Human ABC Transporter Pseudogene Family.”
  94. Mattick and Gagen, “The Evolution of Controlled Multitasked Gene Networks”; Von Sternberg and Shapiro, “How Repeated Retroelements Format Genome Function.” 
  95. In 1994, pro-ID scientist and writer Forrest M. Mims III submitted a letter to the journal Science (which was rejected) predicting function for junk DNA: “DNA that molecular biologists refer to as ‘junk’ don’t necessarily appear so useless to those of us who have designed and written code for digital controllers. They have always reminded me of strings of NOP (No OPeration) instructions. A do-nothing string of NOPs might appear as ‘junk code’ to the uninitiated, but, when inserted in a program loop, a string of NOPs can be used to achieve a precise time delay. Perhaps the ‘junk DNA’ puzzle would be solved more rapidly if a few more computer scientists would make the switch to molecular biology” (“Rejected Publications”). See also Dembski’s prediction already cited. In 2004, Jonathan Wells argued that the theory of intelligent design provides a fruitful heuristic (guide to discovery) for genomic research precisely because it predicts that noncoding DNA should have latent function. As he explained: “The fact that ‘junk DNA’ is not junk has emerged not because of evolutionary theory but in spite of it. On the other hand, people asking research questions in an ID framework would presumably have been looking for the functions of non-coding regions of DNA all along, and we might now know considerably more about them” (“Using Intelligent Design Theory to Guide Scientific Research”). Other scientists have noted how materialistic evolutionary theories have impeded scientific progress in the study of the genome. In 2002, Richard von Sternberg reported extensive evidence for functional junk-DNA, noting that “neo-Darwinian ‘narratives’ have been the primary obstacle to elucidating the effects of these enigmatic components of chromosomes” and concluding that “the selfish DNA narrative and allied frameworks must join the other ‘icons’ of neo-Darwinian evolutionary theory that, despite their variance with empirical evidence, nevertheless persist in the literature” (“On the Roles of Repetitive DNA Elements”). 
  96. Meyer, Signature in the Cell: DNA and the Evidence for Intelligent Design, 481–95.
  97. Jones, Kitzmiller et al. v. Dover Area School Board. As Judge Jones explained, “This self-imposed convention of science, which limits inquiry to testable, natural explanations about the natural world, is referred to by philosophers as ‘methodological naturalism.’”
  98. Murphy, “Phillip Johnson on Trial,” 33. Nancey Murphy is a philosopher and seminary professor who strongly affirms methodological naturalism. Here’s what she says in full: “Science qua science seeks naturalistic explanations for all natural processes. Christians and atheists alike must pursue scientific questions in our era without invoking a Creator. . . . Anyone who attributes the characteristics of living things to creative intelligence has by definition stepped into the arena of either metaphysics or theology.”
  99. Some might object to my description of methodological naturalism as a principle that excludes all intelligent causes from science. They could point out, correctly, that some scholars construe the principle of methodological naturalism (MN) as forbidding, invoking only supernatural intelligent causes, not intelligent causes in general, within science. Nevertheless, nothing follows from this objection. Interpreting the principle of MN in this more limited way doesn’t justify disqualifying intelligent design from consideration as a scientific theory. If methodological naturalism merely forbids reference to supernatural causes in science, then the theory of intelligent design should qualify as a scientific theory. Why? Because the theory itself claims to do no more than establish an intelligent cause, not a supernatural intelligent cause, as the best explanation for the origin of biological information. 

    Now, clearly, some advocates of the theory of intelligent design think (as I do) that the designing intelligence responsible for life is most likely to be a supernatural deity. But again, not much follows from this about the scientific status of the theory itself. Some advocates of the theory of intelligent design do indeed think that the theory has theistic implications. So what? Even if one concedes a definition of science that forbids reference to supernatural entities, all that follows is that the putative implications of intelligent design, not the claims of the theory itself, are unscientific. Some scientists may even offer arguments in support of their contention that the designing intelligence responsible for life is most likely to be a supernatural deity. A definition of science that forbids reference to supernatural entities would then require classifying those arguments as unscientific extrapolations from the evidence. But this would not exclude the evidence itself, since intelligent design theory only allows an inference to the activity of an intelligent cause (not a supernatural intelligent cause) as the best explanation of it. Even so, mere classification of such argumentative extensions as unscientific or metaphysical or religious would not show them to be invalid; science has never had the only corner on truth, and judging the merit of such arguments requires intellectual engagement, not a disdainful anti-intellectualism. 
  100. Some scientists attempt to justify methodological naturalism by using another demarcation argument against intelligent design: ID does not cite a mechanism as the cause of the origin of biological form or information. But this demarcation argument assumes without justification that all scientifically acceptable causes are mechanistic causes. To insist that all causal explanations in science must be mechanistic is to insist that all causal theories must refer only to material entities. A “mechanism” is, after all, just another word for a material cause. Yet this requirement is merely another expression of the principle of methodological naturalism, for which there is no noncircular justification. Furthermore, as Bruce Gordon discusses in his essay on quantum theory in this volume, on pain of empirical contradiction, nonlocal quantum statistical phenomena have no material explanation; in short, the mathematical descriptions of the quintessential expression of modern science preclude the universality of material mechanism as an explanatory principle for natural phenomena. Strangely enough, however, no one seems to be objecting to quantum mechanics on the grounds that it violates methodological naturalism! 

    As I have argued throughout this essay, scientists have tried to justify a categorical exclusion of intelligent causes from science (i.e., methodological naturalism) by reference to specific demarcation criteria such as “testability,” “observability,” or “must explain by natural law.” But, as I have shown, these arguments have failed to justify the exclusion of intelligent causes from science and, thus, the principle of methodological naturalism as a rule for science. The failure of demarcation arguments against intelligent design (or in favor of methodological naturalism) has left scientists without any justification for treating methodological naturalism as a normative rule of scientific practice. Attempts to justify this convention simply restate it in another form: “Scientific theories must cite mechanisms.” Thus, it provides no grounds for excluding consideration of intelligent causes in scientific theories, even if the intelligence in question is ultimately immaterial. 

    This demarcation argument against intelligent design clearly assumes the point at issue, which is whether there are independent and metaphysically neutral reasons for preferring exclusively materialistic causal explanations of origins over explanations that invoke entities such as creative intelligence, conscious agency, mental action, intelligent design or mind—entities that may not ultimately be reducible to matter alone. Since demarcation arguments have failed to provide such reasons, and since we know from first-person experience that our choices and actions as conscious intelligent agents do cause certain kinds of events, structures, and systems to arise—that minds have real causal powers—there does not seem to be any reason for prohibiting scientists from considering this type of cause as a possible explanation for certain kinds of effects. Instead, there is every reason to consider intelligent causes as explanations for effects that are known to arise only from intelligent activity.
  101. Some have argued that the theory of intelligent design is unscientific because it doesn’t cite a mechanism to explain how the designing intelligence responsible for life arranged the constituent parts of life. But this is also true in our own experience. We do not know how our minds influence the material substrate of our brains, the actions of our bodies, or through them the material world around us. Nevertheless, we have good reason to think that our conscious thoughts and decisions do influence the material world. Moreover, we can often know or infer that intelligent thought played a role in the arrangement of matter or outcome of events without knowing exactly how mind influences matter. It’s hard to see how this limitation in our understanding makes the theory of intelligent design unscientific. Many scientific theories do not explain events, evidence, or phenomena by reference to any cause whatsoever, let alone a mechanistic one. Newton’s universal law of gravitation was no less a scientific theory because Newton failed—indeed, refused—to postulate a mechanism or cause for the regular pattern of attraction his law describes. As we noted in the last footnote, quantum mechanics provides another sterling example of an acausal non-mechanistic theory in modern science. In addition, many historical theories about what happened in the past stand on their own without any mechanistic or causal theory about how the events to which such theories attest could have occurred. The theory of universal common descent is generally regarded as a scientific theory even though some scientists do not think there is currently an adequate mechanism to explain how transmutation between lines of descent was achieved. In the same way, there seems little justification for asserting that the geological theory of continental drift became scientific only after the advent of plate tectonics. Although the mechanism provided by plate tectonics certainly helped render continental drift a more persuasive theory, it was nevertheless not strictly necessary to know the mechanism by which continental drift occurs (1) to know or theorize that drift had occurred or (2) to regard a theory of continental drift as scientific. In a similar way, advocates of design can affirm and detect that intelligence played a causal role in the design of life without knowing exactly how mind exerts its influence over matter. All that follows from this admission is that intelligent design does not provide an answer to every question, not that it is an unscientific (or unjustified) explanation in relation to the question it does answer. 
  102. Jones, Kitzmiller et al. v. Dover Area School Board.
  103. There are many types of scientific inquiry in which the convention of methodological naturalism does no damage to the intellectual freedom of scientists. Consider a scientist investigating the question, “How does atmospheric pressure affect crystal growth?” The answer “Crystals were designed by a creative intelligence” (or, for that matter, “Crystals evolved via undirected natural processes”) entirely misses the point of the question. The question demands an answer expressed as a general relationship describing the interaction of two physical entities: gases and crystals. A scientific law expressing such a relationship necessarily describes entirely materialistic entities. 

    Methodological naturalism does not limit the freedom of scientists to theorize in this case. Instead, the question motivating their inquiry ensures that scientists will only consider certain kinds of answers and that these answers will necessarily describe materialistic entities. In this case, methodological naturalism does no harm, though neither is it necessary to guide scientists to appropriate theories. Instead, the implicit question motivating the inquiry will do this on its own. Methodological naturalism and its prohibition against inferring creative intelligence does inhibit inquiry in historical sciences such as archaeology, forensics, paleobiology, cosmology, anthropology, and origin-of-life studies, however, because in the historical sciences researchers are addressing different kinds of questions. They are asking about the causal histories of particular events, events in which the purposeful design of intelligent agents might have played a role. Scientists investigating the origin of life, for example, are motivated by the question, “What happened to cause life to arise on Earth?” Since, conceivably, an intelligent designer could have played a causal role in the origin of life, any rule that prevents scientists from considering that possibility prevents scientists from considering a possibly true hypothesis.
  104. Bridgman, Reflections of a Physicist, 535.
  105. I argue this point at length in my other essay in this volume, “DNA: The Signature in the Cell.” 


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Stephen C. Meyer

Director, Center for Science and Culture
Dr. Stephen C. Meyer received his Ph.D. from the University of Cambridge in the philosophy of science. A former geophysicist and college professor, he now directs the Center for Science and Culture at the Discovery Institute in Seattle. He is author of the New York Times-bestseller Darwin’s Doubt (2013) as well as the book Signature in the Cell (2009) and Return of the God Hypothesis (2021). In 2004, Meyer ignited a firestorm of media and scientific controversy when a biology journal at the Smithsonian Institution published his peer-reviewed scientific article advancing intelligent design. Meyer has been featured on national television and radio programs, including The NewsHour with Jim Lehrer, CBS's Sunday Morning, NBC's Nightly News, ABC's World News, Good Morning America, Nightline, FOX News Live, and the Tavis Smiley show on PBS. He has also been featured in two New York Times front-page stories and has garnered attention in other top-national media.