What did the black africans contributed to humanity (science, techonology...)?

Question: What did the black africans contributed to humanity (science, techonology!.!.!.)!?
Best Answer - Chosen by Asker:

Well, if you mean the former slaves in the U!.S!., There was a lot of agricultural sciences advanced by them!. also many technological items such as the traffic light, anthropological studies in the Arctic and Antarctic!. Of the African Blacks, I can't really think of any!.Www@QuestionHome@Com