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Actually, I believe I had been told that the cracking sound you hear when you bend your fingers/knuckles in such a way, is actually the sound of bubbles of gas between your joints popping. This always seemed logical to me, because in Biology you learn about the different types of gases and acids in the body that build up in certain areas due to movement or lack of movement.

The sound you hear when cracking knuckles is the sound of gas being released in the joints as the presume on them is relieved.

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15y ago

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