This is by far the best explanation I have seen of the phenomenon, both for sense and clarity.
To be honest, I don't understand why there is such an aversion to admitting that people from one place are predisposed to be better at something than people from another. It's quite clear that the human species has adapted to different environments and diverged in some fairly marked ways.
Key example: Black people are much less likely to get skin cancer, and probably other cancers as well, as a knock on.
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