Were Humans and Neanderthals Swapping DNA Earlier Than We Thought?

We’ve known for years that a lot of us are a little Neanderthal: among non-Africans, Neanderthal genes account for about 1-4 percent of our DNA, the result of interbreeding roughly 47,000-65,000 years ago as modern humans left Africa and moved into Neanderthal territory in Europe and Asia.

But a genetic study of multiple individuals, published today in Nature, reveals that Neanderthals interbred with a much earlier wave of human migration, one that left Africa at least 100,000 years ago —

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