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Is cracking your knuckles bad for you?

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: TODAY

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.