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I learned in a university course that kinky hair holds sweat better and allows for better cooling. Where straight, greasy hair drips it off faster.
Another interesting environmental trait is sickle cell because it can prevent or at least lessen malaria.
Really cool idea! I agree on the whole most people are incredibly nice and will go out of their way to explain their reasoning. But a small, loud group seems to crop up in political discussions. It’s interesting because it’s not always they they don’t know they’re being rude, but rather they know and are proud of it because of their beliefs.