A simulation reveals just what is making the satisfying ‘pop’ noise when you crack your knuckles. I mean, I have to say, the use of ‘satisfying’ here is certainly subjective, as for some of us, that ...

I don’t remember how old I was when I first heard someone say, “Don’t crack your knuckles! It’ll give you arthritis!” But I do know that ever since then, I’ve felt a weird pang of guilt any time I do ...