April 16th, 2015
Episode 282 of 1333 episodes
Some people like the sound of knuckle-cracking while others loathe it, but for years there has been disagreement among scientists about what actually causes it. Now, researchers say the familiar cracking sound is caused by the popping of a small bubble of gas in the fingers, and it could even be beneficial to health. Greg Kawchuk is professor of rehabilitation medicine at the University of Alberta and lead author of the research.