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

Neanderthal males had sex with human women, but human men were not so enamoured with Neanderthal females, new research suggests.

Now, geneticists at the University of Pennsylvania say they have a better understanding of the nature of those prehistoric hookups, suggesting the trysts were mostly between male Neanderthals and fema...