Kiwano's KO1+ one-wheel e-scooter ($999 ... and its thick wheel can handle tough terrain. You ride the scooter by standing on foot pegs on the side of the wheel; just push on the battery and ...

To solve this problem, [Make It Extreme] built a custom single-wheel motorbike trailer barely wider than the motorcycle itself. The frame of the trailer is welded together from a couple of ...