How do you know we all came from Africa? That's just a theory, not a proven fact. There are other studies that have been done that show races of humans evolved on different continents.   And if we all did come from Africa, what the hell happened to the negro race? Why did all the others move up the ladder, but blacks just stayed the same, living their simple tribal jungle life for 50,000 years? In China, the general consesus among scientists is the theory that different races of humans evolved separately on separate continents, not the out of Africa THEORY. Aren't them Chinks supposed to be pretty smart? That's what I've heard at least.... Plus, didn't they just find the oldest human fossil to date in Spain recently? And I believe they have also found a human skull in China that pre dates any humanoid fossil found in Africa...