Motorized Scooter : THIS SCOOTER'S NO POLLUTER: Enter the Aqwon, the first hydrogen-powered scooter to meet Germany's stringent regulatory standards. The Aqwon scooter can hit 30 m.p.h. with its two-stroke engine, but the biggest challenge was building a fuel tank that could safely store the hydrogen. In case of accident or fire, the Aqwon's tank simply freezes. If only the Hindenburg had had one of those.