The pop you hear when you crack your knuckles is actually a bubble of gas burning

The noise of cracking or popping in our joints is actually nitrogen bubbles bursting in our synovial fluid. Part of the appeal of knuckle cracking could be that 20-minute lull when gas bubbles are re-forming in the synovial fluid, but the satisfaction is mostly in your head.

view all Interesting and Fun facts

Quotes of the Day

Picture Quotes