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I can guarantee you've experience adrenaline, every day of your life in fact.

Adrenaline is a chemical released in response to fear, and also regulates many bodily functions and processes. "Goosebumps" on your arms when you get cold are actually caused by Adrenaline as well, making the hair follicles swell so the hair will stand straight and trap air to create a warm shield for your skin.

Science is ridiculous :D

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