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Anonymous
Five years ago i read an article about it, so forgive me for not remembering it in detail.. The sound is caused by your bones sliding against eachother, and is not harmfull. There is however a chance that it might, over time grind away on your bones, much like water does on a stone. That was just a theory tough, and i still crack my knuckles. I try to not do it so often touch, just in case.
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