Genetics has radically transformed our understanding of prehistory over the past two decades, revealing everything from the existence of brand-new, unknown species to interbreeding between Neanderthals and our human ancestors. I talked to geneticists Spencer Wells and Razib Khan, two of the world's most knowledgable communicators on genetics and prehistory, to get a sense for how things have changed. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.