By Katie Scott, Wired UK

It has been a long held belief that our human ancestors came into contact with Neanderthals, and recent findings not only confirm this, but also suggest exactly how “close” this contact was.

Damian Labuda of the University of Montreal’s Department of Pediatrics and the CHU Sainte-Justine Research Center and team have found part of the human X chromosome comes from the Neanderthals and is found only in people outside of Africa.

In a paper published in the July issue of the journal Molecular Biology and Evolution, the geneticists write: “We provide e...