We Still Don’t Know What Causes That Knuckle Cracking Sound
Snap, crackle, pop: the sound of cracking knuckles is familiar to everyone, but scientists are having a hell of a time figuring out what causes it. A new ultrasound imaging study offers additional clues, but no definitive answers. The GIF above was created from ultrasound footage collected in a first-of-its-kind knuckle cracking study led by…
