If the idea of combining a Segway, a skateboard and a unicycle sounds like your idea of fun, you might want to check out the Onewheel. It uses gyros, accelerometers, proprietary algorithms and a single rubber tire to give its passengers a smooth, self-balancing ride that supposedly mimics surfing or snowboarding on dry land. Its direct-drive motor pairs with the aforementioned components to determine the boards speed based on a how you lean your body.