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[–] cohSh8Ca 0 points 3 points (+3|-0) ago  (edited ago)

There's probably an argument for a certain amount of social convention carrying over from the days when it was not practical to smile. I suspect another aspect of it is that at that time people had not de-evolved Russian Arctic Fox* style. What you are seeing is the human equivalent of a lack of rounded ears, coloration, etc. When people of European descent were not so fucking domesticated.