To determine what causes the crackle ‘n’ pop, a tiny ultrasound device was hovered over their joints, capturing the sound effects of knuckles being cracked. More than 400 ultrasound images ...

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 ...

There’s even a medical name for that crackling, clicking or popping sound your joints make: crepitus. Here's what causes it.

The wince-inducing sound of knuckles cracking is caused by a small bubble building up in the fluid of the fingers then ‘popping ‘, scientists believe, and it could even be beneficial to health.

The pair wanted to resolve two persistent questions about knuckle cracking: What causes that popping sound, and is it bad for your joints?