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 Many people crack knuckles. They crack it to look like that they are clever, or some people do it because it feels good. There are lot of reasons why people crack knuckles. Some people say that cracking knuckles are not good for our health, and some people hate the sound which is made when people crack knuckles. Recently, scientists have studied about knuckle cracking and the relationship to the human joint. And the result was that knuckle cracking causes tremendous damage to the human joint.