I don't buy that africans have larger muscles and superior physique you say due to race. I can only assume one means African Americans who came from West Africas slave coast, cause I guess when one say that, one doesn't think Xhosa or Somali. I am quite sure a black man from any part of Africa can make it through a Masters degree if they have the opportunity.
I think that the docu series "Guns, Germs and steel" gives a hint about why the civilizations developed as they did.
I would be surprised if poor uneducated people of any race didn't score less on an IQ test than wealthy well educated people of that same ethnic group. This could be used as a eugenic darwinistic proof of that poor people are poor because they are less able meaning that they are their own cause of their unfortune, which generally is false. Most people are not all they can be, cause they either don't get the means and opportunity, are in a difficult position or are just not interested and don't need to. Making abilities a race issue, is the same as claiming it to be a gender issue. Left handed people living shorter lives et al. Be wary of eugenic claims. There are differences between races, such as height, skin colors and bone structure. Generalizations and averages carries no weight when judging individuals. I don't see a good reason for that Nobel prize winners from Africa would be unusual in the future. If one want's to understand the mess of sub-saharan Africa, one needs to look at history and culture and not for race qualities.