From Tiffany Sharples via TIME:
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There is a certain four-letter word that evokes much emotion, is often uttered by mothers giving birth, and whose usage by humans is thought to be evolutionarily adaptive: f___!
According to a new study by British researchers, saying the F word or any other commonly used expletive can work to reduce physical pain — and it seems that people may use curse words by instinct. Indeed, as any owner of a banged shin, whacked funny bone or stubbed toe knows, dancing the agony jig — and shouting its profane theme tune — are about as automatic as the response to a doctor’s reflex hammer. (See 20 ways to get healthy and stay that way.)
To figure out why, psychologists at Britain’s Keele University recruited 64 college students and asked them to stick their hands in a bucket of ice water and endure the pain for several minutes.