Brian Hare tells us the story of Dmitri Belyaev, a geneticist and clandestine Darwinian who lived in Stalinist Russia and studied the domestication of the silver fox. Through generations of selectively breeding a captive population, Belyaev noticed not only increased docility, but also unexpected physical changes. Why did these gentler foxes necessarily look different than their wild ancestors? Tecumseh Fitch has a hypothesis, something about trailblazing cells and embryonic development. And Richard Wrangham takes it a step further, suggesting us humans may have domesticated ourselves.