Most people think that ancient people , +5000 thousand years before Christ, were all barbaric troglodytes, almost devoid of intelligence. Well, I used to think that, as I learned that way in "school". Hope more and more discoveries like this help to put an end to that misconception; I mean , it wasn't linear at all. At the same time as one group of humans were totally undeveloped, other groups were hundreds or even thousands of years ahead in advancement; Some people even go as far as saying there were the atlanteans, lemurians etc, which were far more advanced than we today. It could be true. Nothing preventing it, but if they existed, they left almost no traces after disappearing;