Sunlight produces endorphins. The lighter skin you have, the more UV penetrates, so it produces a stronger endorphin response. Endorphins make you feel calm, relieved and relaxed. However, dark skin blocks UV, so those people produce less of that UV-triggered endorphin response. Which is why when you go to very sunny locations, people with lighter skin just feel more calm and relaxed, Like in California or Australia. Which creates its own type of culture. While the native inhabitants are just normal.
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