The greatest brain size difference is between sexes, not races. Blacks have just 5 cubic centimeters less brain space on average than whites, which isn't that great there are over 1,300 cubic centimeters in the average human brain. What is even more surprising is that black males have, on average, brains that are 6 cubic centimeters larger than a white female's. Of course, one can always argue that brain size doesn't matter, but then again...    This puts us black males in the middle range for brain size:    1) Mongoloid male    2) White male    3) Black male*     4) Mongolid female    5) White female    6) Black female    P.S.    According to the U.S. Census, the average black American IQ is 90. I don't know where this 70 jibberish is coming from...