The history of mating between Homo sapiens, Neanderthals, Denisovans and one or more unknown hominids is presented. It is stated that the Sub-Saharan populations are the only ones deserving to be called Homo sapiens sapiens. The remaining population of the world is composed by Homo sapiens with different percentage of DNA coming from Neanderthals, Denisovans and/or possibly other hominids. It is suggested that this mixture produced individuals able to build great civilizations. Finally some comments about an incorrect comparison between Athenians and current people are presented.