"In her new book, “Origin: A Genetic History of the Americas,” Raff beautifully integrates new data from different sciences (archaeology, genetics, linguistics) and different ways of knowing, including Indigenous oral traditions, in a masterly retelling of the story of how, and when, people reached the Americas. While admittedly not an archaeologist herself, Raff skillfully reveals how well-dated archaeological sites, including recently announced 22,000-year-old human footprints from , are . She builds a persuasive case with both archaeological and genetic evidence that the path to the Americas was coastal (the ) rather than inland, and that was not a bridge but a homeland — twice the size of Texas — inhabited for millenniums by the ancestors of the . Throughout, Raff effectively models how science is done, how hypotheses are tested, and how new data are used to refute old ideas and generate new ones."