When modern humans - Homo sapiens - left Africa around sixty thousand years ago or so, they encountered another human species already living outside Africa, which was the Neanderthals; we now know that the two groups interbred. That’s why many people today from outside the African continent still carry small amounts of Neanderthal DNA on their chromosomes. But there’s an When modern humans - Homo sapiens - left Africa around sixty thousand years ago or so, they encountered another human species already living outside Africa, which was the Neanderthals; we now know that the two groups interbred. That’s why many people... [8025 chars]