Random Thought

According to most textbooks and published material on the subject, humanity became 'civilized' no more than circa 6,000 years ago, or ~4,000BCE. The first centers of civilization were the Fertile Crescent of the Middle East where Sumer and Egypt sprang forth about 3,500BCE, then the Indus Valley and China and 1,500 years later civilization appeared spontaneously and independently in the Americas. All the 'independent' areas just mentioned have and are credited with building pyramids, have stories of  Gods giving the gifts of civilization, studied the stars with incredible accuracy, and seemed to have a real and in-depth knowledge of the vastness of, not only, our world, but, the universe, as well. They did not doubt the existence of peoples from lands across the seas, they did not seem to deny the diversity of humanity, and they seemed to have more open minds about where we came from and how we progressed than do we humans of today. Some of these cultures seemed to ha