Snap, crackle, pop: study reveals secret behind knuckle-cracking

April 15, 2015 6:27 PM

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(Reuters) - Some people like the sound of knuckle-cracking and others loathe it, but for years there has been disagreement among scientists about what actually causes it.

Researchers said on Wednesday they have settled the issue of what occurs inside knuckles to trigger the familiar popping sound, thanks to magnetic resonance imaging (MRI) experiments that they jokingly dubbed the "pull my finger study."

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