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Polynesians are cold adapted in a number of ways, which you can read about here: https://twitter.com/crimkadid/status/1264783217237909514 … The muscular bulk of Pacific Islanders allows them to shiver more effectively than other people, but anthropologists have also noticed that they just seem to shiver less. Why?
A group measuring Polynesian skulls uncovered a neurological cold adaptation I had never heard of: the infraorbital foramen through which sensory nerves travel are abnormally narrow and the proposed result is that Polynesians skin sensitivity is reduced: https://sci-hub.se/https://www.tandfonline.com/doi/abs/10.1080/030144699282831 …
Shivering is an good way to build up heat, but it's also calorically expensive and leaves people vulnerable to infection. Cold adapted people therefore evolve to shiver effectively but rarely. You have to wonder if this kind of neurological adapation might also affect character.
That is to say, could the fact that northern people around the world tend to be a bit stone faced and stoic be related to the fact that their skins have been pre-adapted to ignore sudden changes in temperature?
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