It turns out to be an ancient phenomenon acquired from animals. Goose bumps come from the constriction of hair follicles. In the world of animals, this helps them warm up faster. In case of a threat, such a hair state helps an animal look bigger and more massive in front of an enemy. We also get goose bumps in cold weather or in emotional situations. It is the result of a subconscious adrenaline hormone emission.
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