By Michelle Starr For the first time, an MRI video has been taken of cracking knuckles, answering once and for all what makes the audible pop.

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Source:: http://cnet.com.feedsportal.com/c/34938/f/645093/s/4570c432/sc/32/l/0L0Scnet0N0Cnews0Cmystery0Esolved0Ewhy0Edo0Eknuckles0Ecrack0C0Tftag0FCAD590Aa51e/story01.htm