I have to admit, for as nasty as some of you may find it, I crack many of my joints. And this morning, as I was cracking my knuckles, I thought that I could do a post on it. I looked through a bunch of sites and only found 2 that were semi informative (most of the sites just sound like folklore). So here are your reads.
http://www.abc.net.au/science/k2/homework/s95607.htm
http://www.washingtonpost.com/wp-dyn/content/article/2009/02/22/AR2009022201783.html
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