When you crack your knuckles, you're creating bubbles
The next time you crack your knuckle, know that you're actually creating little gas-filled bubbles in the fluid that lubricates your knuckle's joints. The cavities appear because the bones at…
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The next time you crack your knuckle, know that you're actually creating little gas-filled bubbles in the fluid that lubricates your knuckle's joints. The cavities appear because the bones at…