Scientists offer new explanation for knuckle-cracking
The noise may emanate when bubbles in a joint’s fluid partially collapse
![860_main_knucklecracking.gif](https://www.snexplores.org/wp-content/uploads/2019/11/860_main_knucklecracking.gif)
Stretching out your knuckles can sometimes release a sharp pop or two. Scientists have a new explanation for what’s behind the cracking.
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