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The Effects of Sunlight on Fear of Nature
When humans are in the sun, all sorts of good things happen. Nitric oxide helps dilate blood vessels. The sun also creates endorphins that feel good. This is a very clear pathway by which humans are reinforced to be in the sun. If you live in a place that's cloudy for most of the winter or far from the equator, when the sun comes out, you're in the Sun.