Between 60 and 70 thousand years ago, the ancestors of modern humans were on the move, and their made it more likely for their modern descendants to be early risers, according to a new study.Migrating into Europe, our ancient human ancestors came out of Africa and encountered Neanderthals and Denisovans - with whom we share of our DNA.New research suggests that the three groups interbred and passed on genes that helped the following generations adapt to the northern climate and sunlight.
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