Intelligent design theory expects that we should find deeper and deeper layers of function in biology, which by the same token represents a big problem for Darwinian evolution. In the past we’ve noted papers finding function for synonymous codons (for example, see here and here) — but the functions reported in those papers generally pertained to controlling translation speed. Now a paper in the journal Cell has found a new potential function, namely that synonymous codons can control the rate at which mRNA transcripts degrade and are broken down within cells. Casey Luskin reports at Evolution News & Views.