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knuckle cracking harmless_00000303
knuckle cracking harmless_00000303

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    Knuckle cracking is actually good for you

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Knuckle cracking is actually good for you

Knuckle cracking may sound horrible, but these scans show knuckle cracking is actually good for your hands. CNN's Elizabeth Cohen reports.

Knuckle cracking is actually good for you

Knuckle cracking may sound horrible, but these scans show knuckle cracking is actually good for your hands. CNN's Elizabeth Cohen reports.