What sets Dr. Hart apart is his analysis of history in the light of racial differences in intelligence. Just as Richard Lynn and Tatu Vanhanen can solve problems that baffle development economists because they understand race and IQ, Dr. Hart finds patterns and offers explanations for what would otherwise seem random. Dr. Hart writes that “the overall evidence that there is a substantial genetic contribution to racial differences in average IQ is so great that no one would dispute the point if it were not an issue that aroused strong emotions on ideological grounds.”
There are also human populations distinguished by how little they have contributed. Reports of pre-contact sub-Saharan Africans are consistent: No tribe in that vast area had the wheel, writing, a calendar, or a mechanical device of any kind. Metal working had been introduced from the north, but in all of black Africa there were no two-story buildings and no monuments to compare even with the stone statues of Easter Island. Madagascar is 250 miles off the African coast, but Africans never settled it. It was populated from 3,000 miles away by Southeast Asians who arrived around 500 AD. Africans continue to be largely incapable of absorbing the science and technology of others, and have not added to it.
Australian aborigines were even more primitive than Africans when whites first found them. They were living in the old stone age, which is to say they did not work metal and had no domesticated crops. They had invented one thing: the boomerang, which they used as a weapon. The Tasmanians were more primitive still. When the ocean rose, the Tasmanians were unable to cross the Bass Strait. During their 10,000 years of separation, they became even more primitive than before: They forgot how to make sewing needles and fishhooks.