New research reveals that ancient interbreeding between humans and Neanderthals shaped our modern human DNA - especially on the X chromosome.

Humans and Neanderthals cozied up from time to time when they lived in the same areas tens of thousands of years ago. A new ...

FILE: Reconstructions of a Neanderthal man, left, and woman at the Neanderthal museum in Mettmann, Germany, March 2009 ...

Learn how sex-biased interbreeding between Neanderthals and modern humans explains why Neanderthal DNA is largely missing ...

If more human females mated with Neanderthal males than the other way around, over thousands of years you would expect to see ...

The human genome is a rich, complex record of migration, encounters, and inheritance written over thousands of millennia. In ...