8 years ago
Here's Why Your Knuckles Crack
A new study helps confirm an old theory. The human body has always been something of a two-legged calliope—a sound effects machine capable of an almost unlimited range of noises. Some are pretty easy to understand—the whistle, the sneeze, the, well, you can figure out the others. Some are more mysterious—which brings us to knuckle-cracking.
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