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Even now, at least thirty thousand years after the fact, the signal is discernible: all non-Africans, from the New Guineans to the French to the Han Chinese, carry somewhere between one and four per cent Neanderthal DNA.
Hammer says that the interbreeding didn't stop with Neanderthals, however, but because of environmental conditions, we haven't been able to do the same genetic research with our African ancestors.
Hammer says that despite earlier skepticism about interbreeding between human species and despite the belief that humans were an exception to certain laws of evolution, our DNA shows otherwise.
One big question remains: Why did modern man survive as the archaic species died off?
"We don't have fossil DNA from Africa to compare with ours," Hammer explains.
A plant manager and other officials at the plant were replaced two years ago as the investigation proceeded.
Using modern human DNA, Hammer says, they were able to "simulate history" and sort of reverse-engineer human DNA.
In doing so, they found evidence that , the "tool-using man," and possibly others.
By about forty-five thousand years ago, modern humans had already reached Australia, a journey that, even mid-ice age, meant crossing open water.
Archaic humans like "spread like many other mammals in the Old World," Pääbo told me.