Scientists have turned their attention to investigating that most annoying of human habits - the sound made when you crack your knuckles. The characteristic pop can be explained by three mathematical ...

It’s one of the most annoying habits, but it's also pretty mysterious. What actually causes the sound of cracking knuckles? Researchers long believed the sound was caused by the collapse of bubbles ...

The reason why knuckles pop or crack when stretched is largely a mystery, but a recent study claims it's because of popping fluid bubbles. When these bubbles collapse or even partially collapse in a ...