The Scientific Reason Why Knuckles Crack is Not What You'd Expect

The sweet release of cracking knuckles has always baffled scientists. Over the years, scientists trying to explain the cracking sound have pointed to “bubbles” created by rapid pressure changes in the knuckle joints, but they have been unable to determine whether the sound has to do with bubbles popping or bubbles forming. A study published in Scientific Reports on Thursday, however, offers a new mathematical explanation that seems to settle the debate.

The new paper suggests that the...

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