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Knuckle Cracking Still Unexplained

The sound of cracking knuckles is familiar to everyone, but scientists are having a hell of a time figuring out what causes it. A new ultrasound imaging study offers additional clues, but still no definitive answers. http://gizmodo.com/we-still-don-t-know-what-causes-that-knuckle-cracking-s-1746393614 #tech

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