Why you shouldn't crack your knuckles?

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  2. #without
  3. #called
  4. #directions
  5. #popping
  6. #sound
  7. #those
  8. #causing
  9. #knuckles
  10. #fingers
  11. #joints
  12. #bubbles
  13. #fluid
  14. #cushioning
  15. #between
  16. #different
  17. #crack
  18. #caused
  19. #collapse
  20. #allows