Fidgeting didn't start with the spinner craze. If you've ever clicked a ballpoint pen again and again, you've used a fidget item. As part of our work, we've asked people what items they like to fidget ...

The fidget spinner has a bafflingly simple design. Think of a tiny propeller that spins on your fingertip. There is a ball bearing in the middle surrounded by a metal -- or plastic or ceramic -- frame ...