In this episode, evolutionary biologist Sean Carroll talks about his new book, "The Making of the Fittest: DNA and the Ultimate Forensic Record of Evolution." Even without fossils or comparative anatomy, vast amounts of evidence for evolution and its mechanisms exist in the genomes of the organisms alive today. Carroll discusses immortal genes, fossil genes and repetition in evolution, as well as environmental issues in light of evolutionary understanding. Plus we'll test your knowledge of some recent science in the news. Websites mentioned on this episode include;;;;