In May 2010, biologists broke the news that our modern human ancestors had sex with their Neanderthal cousins in Europe and Western Asia as they trudged out of Africa to colonise the world.
Many of us who live outside Africa today are a living legacy of those ancient couplings. Though modern humans more or less replaced Neanderthals, the encounters left an imprint on our genetic makeup. We carry inside our cells a smidgen of Neanderthal DNA.
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