500 thousand years ago, we all started pretty much the same. Fast forward to the Colonial Era and the blacks in Africa (as well as the American Indian) were still pretty much in the Stone Age. Today in Africa, whatever modicum of civilized society they have, they owe to the Europeans. The WHEEL for chrissake was unknown in Africa until the 1600s. And no I don't buy they excuse they didn't develop because the fruit on their trees hung lower and the weather was nicer.