This is probably the beginning of the end for petrol-powered cars. A Japanese company called Genepax, dedicated to finding ways to turn water into power, has unveiled what it calls the first practical car to run solely on water. The firm claims putting just one litre of water is enough to keep its automobile going for 60 minutes at a respectable speed of 80 kph. And the water can be from the tap, falling rain or even from rivers.