So, there can't be a Master Race. Sports fans can cite countless examples. Men of West African descent monopolize the Olympic 100m dash, but their explosive musculature, which is so helpful in sprinting, weighs them down in distance running, where they are also-rans. Similarly, there are far more Samoans in the National Football League than Chinese, simply because Samoans tend to be much, much bigger. But precisely because Samoans are so huge, they'll never do as well as the Chinese in gymnastics.
Every person falls into a single clear-cut racial group .
This one is so silly that I doubt that anybody who has thought about race in the real world for more than ten minutes believes this. Nobody can agree on how many racial groups there are, exactly who is in each one, or what to call them. Since nobody can agree on how many racial groups there are, exactly who is in each one, or what to call them, then race does not exist . This one's equally daft. Outside of mathematics, and of human inventions like the law, categories almost always fall across continuous dimensions.