The research has been so informative that the route invaders took is clear. An earlier movement of eastern people has also been identified. It took place 11,000 years ago. invaders moved through south-eastern Europe via the Carpathian Basin near present day Hungary into central Europe.
The history of Man is fascinating and we do not have all the answers yet. Perhaps in the past a civilization equal to our own existed and all the knowledge they had has been lost. There are many mysterious things we do not know about ancient Egyptians. Their culture faded only in recent times.