An artist’s rendering of a human skull, at left, and a Neanderthal skull. Most people alive today carry a bit of Neanderthal DNA in their genome, the result of interbreeding tens of thousands of years ago.
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However it played out, the preference was intense. “You need a strikingly strong phenomenon to get us there,” said Alexander Platt, a geneticist at the University of Pennsylvania and an author of the new study.
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