The big knuckle debate centers on one big question: What makes the cracking sound? Back in 1947, it was suggested that the sound occurred when a bubble formed in the fluid between joints. But in 1971, another group claimed it was actually the collapse of that bubble that made the noise, not the formation. The latest study (back in April) seemed to confirm the latter by tracking the action of knuckle cracking inside an MRI, but it only featured a sample size of one (or 10, I suppose, if you count all of his fingers).
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