Ancient European People Suddenly Vanished! I Suspect UFOs

This is one strange conundrum for archaeologist that study ancient European peoples.

"What is intriguing is that the genetic markers of this first pan-European culture, which was clearly very successful, were then suddenly replaced around 4,500 years ago, and we don't know why," said study co-author Alan Cooper, of the University of Adelaide Australian Center for Ancient DNA, in a statement. "Something major happened, and the hunt is now on to find out what that was."

I suspect that the early European peoples were taken en-mass by aliens for breeding and the re-population of their horribly scarred world. Eventually the humans died out because 4500 years of inbreeding made them horrible man-beasts. So that is why the aliens came back to study the current culture to see if they have to make another harvest of human breeding-stock.