Hydrogen Fuel Balls

The Department of Energy has filed a patent for hydrogen fuel balls. The proposed glass microspheres would each be a few millionths of a metre (microns) wide with a hollow centre containing specks of palladium. The walls of each sphere would also have pores just a few ten-billionths of a metre in diameter. They are supposedly safe and small enough to be pumped into a fuel tank in the same manner as petrol