Some Spanish engineers have come up with a radio controlled car that is powered by soda can tabs. The dAlH2Orean H2 R/C Car is powered by aluminium. The tabs off soda cans are placed in the reaction chamber along with some sodium hydroxide. The reaction produces hydrogen which runs the car for up to 40 minutes on one tank. The idea might not replace gas anytime soon, but a cool concept that takes every day scrap aluminium and coverts into energy.