Evan Bush is a science reporter for NBC News.
Hidden in many people’s genetic codes is a mystery that has long intrigued scientists — a tiny slice of Neanderthal DNA that persists tens of thousands of years after the species vanished. Most non-African people can attribute around 1% to 2% of their DNA to Neanderthal ancestors. But the details of that evolutionary history have remained unclear.
Many scientists suspect the two species crossed paths in the Middle East, but that’s not confirmed. After the interbreeding, natural selection kept a few traits from Neanderthals while ditching many more.
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