Ancient Americans inherited a Denisovan gene that strengthened their resilience to new environments, with traces still present in many today. Credit: Shutterstock Thousands of years ago, ancient humans undertook a treacherous journey, crossing hundreds of miles of ice over the Bering Strait to the unknown world of the Americas. Now, a new study led by the University of Colorado Boulder suggests that these nomads carried something surprising with them -- a chunk of DNA inherited from a now-

Tag-uri: DNA