Everyone has an invisible bubble around them which strangers aren’t supposed to enter without permission. The size of the bubble, dictated by stress, informs a person's intuitions about “rights” and “privacy”, in Norwegians the bubble is huge, in Alpines it’s tiny.
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Life would be easy if we were all immune to stress, which raises the question of what cortisol exactly does for us. The most obvious answer is that it makes breathing easier, infants with weak lungs can be saved by administering glucocorticoids:https://onlinelibrary.wiley.com/doi/abs/10.1002/ppul.1092 …
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Dogs are not uniformly brachycephalic, they vary in proportion to their physical demands: the more a dog wanders and runs the more its facial proportions resemble that of dolichocephalic horses. Brachycephalic bulldogs have real difficulty breathing:https://en.wikipedia.org/wiki/Brachycephalic_airway_obstructive_syndrome …
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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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