Anyone who's spent any time with a kid between the ages of five and fifteen recently has probably encountered a fidget spinner. These flat, three-pronged, spinning toys are marketed as ways to help autistic students or those with ADHD focus by giving the hands something to do. However, some schools have banned fidget spinners because, well, they're too interesting. They actually grab kids' attention. And it's no wonder. It turns out there’s a lot of physics in each small fidget spinner – rolling