The human body has warning signals in place to protect you from danger. Whether it's a sudden release of adrenaline in life-threatening situations or a pain signal when you eat something that's too hot, reactions in your body are there to tell you not to do something. In the case of downing a shot of liquor, that burning sensation isn't real heat; it's your own body's warning signals gone awry.

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If you'd like to learn more about the chemistry of your favorite cocktails, check out "Proof: The Science of Booze" by Adam Rogers. We handpick reading recommendations we think you may like. If you choose to make a purchase through that link, Curiosity will get a share of the sale.