Ancient Europeans, represented by a roughly 30,000-year-old French Homo sapiens skull shown at left, interbred with Neandertals, represented by a 70,000- to 50,000-year-old French skull on the right, before spreading Neandertal genes into Africa, a new study finds.
From left: The Natural History Museum/Alamy Stock Photo; Sabena Jane Blackbird/Alamy Stock Photo