National Book Critics Circle Award—2017 Nonfiction Finalist “Nothing less than a tour de force—a heady amalgam of science, history, a little bit of anthropology and plenty of nuanced, captivating storytelling.”—The New York Times Book Review, Editor's ChoiceA National Geographic Best Book of 2017 In our unique genomes, every one of us carries the story of our species—births, deaths, disease, war, famine, migration, and a lot of sex. But those stories have always been locked a