Human evolution is looking more tangled than ever. A new genetic study of nearly two thousand people from around the world suggests that some of our ancestors bred with other species of humans, such as Neanderthals, at least twice.
"The researchers suggest the interbreeding happened about 60,000 years ago in the eastern Mediterranean and, more recently, about 45,000 years ago in eastern Asia," Nature News reports from the annual meeting of the American Society of Physical Anthropologists in Albuquerque, New Mexico.
That conclusion is based on a study of over 600 genetic markers, called microsatellites, sequenced in nearly 100 different populations.
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