It's bullshit, when you pop your knuckles carbon dioxide is being released from the knucles thats it. Your body naturally produces this and releasing the pressure isn't bad for you. I also saw it on MTV myth show. And that study doesn't express certain things, who the people were, was it a simple random sample, etc... For all you know those 300 people were construction workers.
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If something seems too good to be true, then it probably is....
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