Good morning. I'm Noel King with the answer to a mystery that has puzzled scientists and kids for years. When we crack our knuckles, why do they make that popping sound? A grad student in France, ...

If you've ever heard your knees pop when you stand up or noticed a cracking sound in your back as you stretch, you’re not alone. These sounds, medically known as crepitus, are common and usually ...

It might make you cringe, or it might bring you sweet, satisfying relief. Cracking your knuckles is one of those oddly divisive habits. Some people do it absentmindedly, while others can't stand the ...