I found the arguement persuasive but he stops the idea of natural selection with the conclusion that primative peoples are generally more quick witted and industrialised peoples are more robust.

He never explores the idea that Europeans might be genetically more techically minded. You get some European or Asian Engineers who can look at something and see how it works and some Africans and Aborigines (sp?) that have trouble understanding 3-D space.

It doesn't make one smarter than the other but it makes one more gifted in acertain area, conversly I don't know of very many European sprinters, or many who can learn as fast as "primatives"

Different racial groups look different because they are adapted to different environments, why can't they have differently adapted minds as well? If Africans actually are less "intelligant" than Europeans its because the talents we value the most are the ones most useful in our environment.

In the middle of the jungle no one looks more stupid than a white PhD.

If this offends anyone I apologise and of course there is no evidence either way because no-one will do the tests.