Why are you basing a whole race on the basis of pigments in the skin? The reason that they may be the least intelligent is because of them being labelled daily by the media. They will see that black people are stereotyped be aggressive, be in gangs and follow a self fulfilling prophecy
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Researches show that blacks in other countries have even lower IQ (85 in the US vs. 70 in Africa).
IQ coefficient is very general concept. Personally, I do not trust him. Everyone - this indiidualnost. And among all races there are geniuses, and there are idiots