It was beyond a doubt to my mum and almost all women everywhere that cracking your knuckles led to arthritis, it was beyond a doubt. Except it doesn't, there's

It was beyond a doubt to my mum and almost all women everywhere that cracking your knuckles led to arthritis, it was beyond a doubt. Except it doesn't, there's not even a hint of a link between the two. Just because something seems obvious, doesn't mean its right or that the science behind it won't lead to something more interesting.