I think it’s racist what your friend said. I don’t even know which races were chosen. Intelligence begats intelligence; its all in who you mate and the economic conditions around the child thereafter (food quality, leisure time). It has nothing to do with bone structure. In genetics there are simply degrees of similarity, usually tied to geography, not actual races. There are three different classifications of bone structure, which are not perfect categories either.
CLEARLY ALL the races are all 100% equal in all respects, and most certainly that applies to intelligence. All the races are clearly the same everywhere, and they live the same, act the same, and are indistinguishable from each other in every respect. The writers of “The Bell Curve” are retarded racists pigs who got it all wrong, and the ONLY reason that certain groups in this country (I won’t say who) always outperform certain other groups (I wont’t say who) in all things academic, intellectual, and mental is because that “dominant” group is composed of racist pigs who hold the other group down. And that “held down” group spends a LOT more time in prison, because, as you say, they don’t have good leisure time.