Seven years ago I figured out this piece of "common sense," which I had drilled into me since I was old enough to walk by all media around the clock, was in fact absolute baloney.
The truth is, nothing of merit has ever come out of Africa in the history of the planet. Nothing.
Modern man, (Homo Sapiens) arose from the conditions surrounding the Toba volcano super eruption some 74,000 years ago and the resulting bottleneck on the human population. The forcible migration into the Caucasus was by cold adapted Asian people (the ancestors of Eskimos) who then underwent further environment specific evolutionary change. We have a great deal in common with Japanese and Chinese people genetically despite many apparent differences. Africans are modestly described in the anthropology literature as "least specialized" which is a courteous way of saying they have fewer genes in common with the rest of mankind than any other race and show no sign at all of having been placed under environmental stress of the sort required to hone their genetics in response to broad selection in adverse conditions.
The evidence just isn't there but what is most shocking is that there was never really any evidence to support this hypothesis. I mean, none at all. It was just trendy to say during the turbulent 1960's if you were a Marxist academic who wanted to score more points off the fish in the barrel called Western civilization. Of evidence, there was simply none at all. They found some human fossils in Africa, ergo, we must all have come from Africa.
It's noteworthy that well into the 1950's many anthropologists had conjectured that modern mankind had begun to develop in India or Asia. So it has taken a half a century to get back to scratch where we were in 1949. That's your "progress" for you.