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PARIS: 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?"It could be multiple bubbles, but we showed that the collapse of a single bubble is sufficient to give you the signature sound you get," he told AFP by phone.Although experts had initially linked the popping sound to the collapse of knuckle bubbles back in 1971, their findings were thrown into question after further studies showed that there were still bubbles left in the fluid after the knuckles had been cracked.But the mathematical model appears to resolve this apparent contradiction by showing the sound can be produced by partial collapse, the researchers said.
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