Fox News posted this article explaining the sound from cracking your knuckles has finally been put to rest. The video shows the creation of a sort of vacuum when pulling the bones apart. The article even quotes the doctor of the "Pull My Finger" study as saying, "As the joint surfaces suddenly separate, there is no more fluid available to fill the area, so a cavity or vacuum is created." Thus the sound comes from the creation of a little bubble or vacuum between the joints. I found this fascinating because I crack my fingers, toes, back, and neck constantly every single day. I think you're weird if you don't crack anything.
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