Why cracking your knuckles can be so noisy
The sound comes from the partial collapse of bubbles in joint fluid, study suggests
![cracking knuckles](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/03/032818_EC_knuckles_main.jpg?fit=860%2C460&ssl=1)
TOUGH TO CRACK The peculiar noises of cracked knuckles can be explained by bubbles in the joint fluid that collapse partway, a new study reports.
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