Humans today could be part Neanderthal, according to a new study that found our ancestors interbred with an extinct hominid species some millennia ago.
Neanderthals walked the Earth between about 130,000 and 30,000 years ago. While they co-existed with modern humans for a while, eventually they went extinct and we didn't. There has been intense scientific debate over how similar the two species were, and whether they might have mated with each other.
"The issue has been highly contentious for some time," said University of New Mexico genetic anthropologist Keith Hunley.
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