Does anyone know the science behind it? It's not mentioned in any of the video reports, but they say it splits water to produce hydrogen gas, which the most simple way would be through electrolysis. Another method would be to produce hydrogen by reacting with a reactive metal, but then both of these techniques still require energy to produce the splitting element. Basically it's a glorified electric car if I got it right, and that'll just push up electricity bills, which I guess could be resolved by more renewable sources, but considering the amount needed :s.