He claimed to have scientific evidence of an inherited link between brain size, intelligence and race, where Blacks and Asians are on opposite ends and Whites are in between.

Blacks, according to Rushton, have larger genitals, making them more promiscuous, and smaller brains, making them less intelligent than whites and Asians. Using 60 different measures, Rushton ranks the races along an evolutionary scale with blacks at the bottom and Asians at the top.

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