HiThere
The Living Force
"ACAD Director Professor Alan Cooper says: "What is intriguing is that the genetic markers of this first pan-European culture, which was clearly very successful, were then suddenly replaced around 4500 years ago, and we don't know why. Something major happened, and the hunt is now on to find out what that was."
_http://phys.org/news/2013-04-ancient-dna-reveals-europe-dynamic.html
_http://phys.org/news/2013-04-ancient-dna-reveals-europe-dynamic.html