Is cracking your knuckles bad for you?

Question

Is cracking your knuckles bad for you?

Answer

A doctor cracked the knuckles on his left hand twice a day for 60 years, and he has no trace of arthritis or other health concerns. Others back up his research.

Source: http://www.today.com/video/today/56993080#56993080

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Was cracking knuckles

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