What is cracking your knuckles?

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Tags

1. #until
2. #released
3. #order
4. #return
5. #bubbles
6. #escaping
7. #joint
8. #gases
9. #forms
10. #again
11. #fluid
12. #which
13. #synovial
14. #joints
15. #stretch
16. #lubricant
17. #knuckle
18. #rapidly
19. #present
20. #explain
21. #capsule
22. #scientists
23. #crack