Why does cracking knuckles feel good?

Related questions

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Tags

1. #cavitation
2. #popping
3. #either
4. #process
5. #releasing
6. #boiling
7. #pressure
8. #joints
9. #makes
10. #cracking
11. #noise
12. #usually
13. #becomes
14. #harmful
15. #fluid
16. #known