Can height superiority of one race over another be proven? I am pretty sure that black people are the tallest of all people. What is different about intelligence that makes it so that it is the one variable trait of individual humans that is uniformly distributed across all races? It really isn't a far leap from 'not all races average the same height' to 'not all races perform equally well on IQ tests', and indeed science has shown that both of these claims are true and that the root cause of this is primarily although not exclusively genetics.