Stated differently, questioning the science behind the claimed differences in IQ results will only bog you down in a wild goose chase. The way to argue this crap is to say, "ok if there are observable differences in IQ scores, as you claim, so what? What does that mean? How is that different from any other observable differences in human abilities?" That will force them to make a statement that they currently only implicitly assume, namely that IQ is a more important factor in human 'aptitude' and life success than other abilities. And that is where they are most vulnerable and can be easily refuted. Otherwise, they take the high ground by claiming that "we" deny the obvious fact that there are observable differences among human groups.
Wojtek
^^^^^^^ CB: And that the observable differences are entirely explainable by the adverse effect of racism on darker people and privileging effect on lighter people; not genetic differences, i.e. the observable differences are socially constructed not genetically caused. Just like racism explains the difference in average incomes between Blacks and whites.
In other words, all through life, from early childhood , in general, whites are given advantages by the institution of racism which causes them to learn better than Blacks the topics that are tested in IQ. As is said in the affirmative action debates, US society has comprehensive, cradle to grave, affirmative action in favor of whites , and has had for centuries. This explains the observable differences.