Jared Diamond expressed the view that uncivilised people are more intelligent than civilised ones, but didn't actually provide any evidence. Now, I am a zoologist, not a psychometrician, but two things are pretty obvious to me. The first is that intelligence is not a social construct; some people really are born smarter than others. The second is that race is real. We may be all brothers under the skin, but my blood line separated from that of the Aborigines about 2,000 generations ago, and from Africans nearly 3,000 generations ago. A lot can happen in that time. Therefore, I find it extremely unlikely that the various races can differ in (say) average height, but be exactly the same in average intelligence. On the other hand, some of the extremely low racial IQ I have seen quoted make my baloney meter light up.