Some peoples have genuinely unique personalities, like the Jews and Irish, but most national characters were not selected for per se but emerge from unusual combinations of traits. To give one relevant example, the Germans:
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There are three clusters of people in Europe that produce large numbers of great distance runners: 1. Norway 2. Iberia and 3. Britain, especially Wales. The universal pattern, in Europe or in Africa, is that people who raise animals in hills, like the Kalenjin, can run for days.
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There is essentially a trade off: active human societies of hunters, herders, or isolated farmers maintain strong lungs, primarily I think to survive respiratory infections. When life becomes sedentary and stressful cortisol no longer pays for itself.
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That’s the end of my 4,000 tweet thread. Hope it brought all the peoples of the world together, even the ones I don’t like.
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End of conversation
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