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Why do the bones in your body KRACK!!
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Why do the bones in your body KRACK!!

User Azulflame
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Joint cracking is often and escape of air Synovial fluid lubricates joints, and this fluid is made of oxygen, carbon dioxide, and nitrogen. Sometimes when the joint moves, gas is released, and you hear the "popping' or "cracking' noise.
User Eric Hartmann
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