You dont have to buy my notion. Have you ever heard of "Mitochondrial Eve"? 140k-200k BP is the age on the remains found in Africa. Nothing older so far. Look it up. Sumerian were also Black Africans descended from the Nubians or Kushite and indeed had a civilization in what is now Iraq but that has nothing to do with with what we are talking about. The knowledge long touted as the "Greek miracle" was provided by the Egyptians who were undoubtedly Black Africans. Found something really wack that links the Sumerian with Eve in Africa that is really crazy but gotta go.
I have no doubt that many of the greek technological/mathematical 'discoveries' were based on forgotten/re-discovered Egyptian ( or Babylonian) knowledge, history supports it, is there a question on that?
as far as Egyptians being 'black african'? Uhm, no. I am sure theres some evolutionary roots, but to classify them as African as we understand them, would be to deny their own vision of themselves, their location, growth in the nile valley and the real differences prevalent, example-
from the funerary palace of Seti I.....