One of the largest difficulties with evolution is the word itself. Supporters of Darwinian theory love to switch the word around so the average person can never be sure what they are talking about. Sometimes evolution means change over time. Other times it can refer to small-scale changes in populations, or common ancestry, or the idea that an unguided mechanism of natural selection acting on random variations is the driver of the history of life. In this bonus interview released as part of the Science Uprising series, geologist Casey Luskin goes over the multiple definitions for evolution and explains how the fossil record relates to the Darwinian theory of evolution.