A major DNA study suggests that our ancestors interbred with the Neanderthals at least twice tens of thousands of years ago - and that their genes have been carried down the millennia ever since.
The discovery adds to the mystery surrounding the Neanderthals, an offshoot of the human family tree who vanished in Europe around 25,000 years ago.
A new study suggests that most of us have some Neanderthal genes in our DNA. Scientists believe our ancestors may have bred twice with the extinct species
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