Experts Find Answer to the Knuckle-Popping Puzzle

It has puzzled scientists for over 100 years but now they appear to have cracked it: what, exactly, is it that causes that wince-inducing sound when you pop your knuckles?

Love it or loathe it, knuckle-cracking is very common. Earlier studies have established that not all joints can be cracked, and that – for that those that can – the act can’t be repeated for another 20 minutes.

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