“European culture is extremely diverse; distinct customs and peoples live there side-by-side in relatively small but clearly-defined regions. One would imagine that the development of Europe consisted of historically understandable transitions—but according to research at the Australian Center for Ancient DNA, genetic markers in skeletons sampled for DNA suggest a sudden, drastic change around 4,500 years ago.
According to paleo-anthropologist Dr. Alan Cooper, “Something major happened, and the hunt is now on to find out what that was.” The mysterious event or cataclysm may never be determined, but it’s possible that an unknown plague, or else a mysterious conflict or agreement between ancient tribes, may hold the key to Europe’s anomalous past.”
Interestingly this is about the same time as agriculture and writing were created/discovered. And also the point in time when God created man according to the creationists and fundamental jews/christians.