For years, scientists have known that Neanderthals and modern humans interbred, leaving behind genetic traces that still ...

Some critics of the theory of evolution argue that it doesn ... natural variation that they would become two separate non-interbreeding species. One of the most powerful counters to that argument ...

This interbreeding between species left an indelible mark that remains present in our current DNA. Between 50,500 and 43,000 years ago, Homo sapiens and Neanderthals shared a unique moment in history.