Race, Evolution and Behavior

New edition: The author, a professor at Western Ontario university, shows that substantial racial differences exist and their pattern can only be explained adequately from an evolutionary perspective. This work reviews international data and finds a distinct pattern: People of East Asian ancestry and people of African ancestry are at opposite ends of a continuum, with people of European ancestry intermediate, albeit with much variability within each broad grouping. Rushton's thesis is that when fully modern humans migrated out of Africa. perhaps only 100,000 years ago, the colder Eurasian climate selected for larger brains, more forward planning, greater family stability, and increased longevity with concomitant reductions in sex hormone, speed of maturation, reproductive potency, and aggressiveness. Rushton's theory explains differentiation in intelligence and predicts other, seemingly unrelated race effects, such as differences in frequency of twinning. A modern masterpiece of science and irrefutable fact.