I can read about something scary, or watch a video where someone does something great for someone else, and immediately get chills up and down my arm. Why?
In: 2
When we’re scared, the tiny muscles attached to our body hairs contract so that the hairs stand up. That’s what gives you those chill bumps on your skin. For animals, this has the purpose of making them appear bigger, thus more capable of driving away whatever threat made them scared in the first place. But in humans, body hair has become shorter and shorter during evolution, so we don’t actually appear bigger, we just get the chills.
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