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Goosebumps are the result of flexing muscles at the base of each hair follicle. There are two reasons humans get goosebumps. The first happens when someone is cold. The second is when you’re scared and works much like a cat’s fur when it feels threatened – by raising the hair when we’re ready to fight it made us appear bigger. At least it would work in theory if we were covered in fur or thick hair.
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