But wait, a "tall, rangy, blond, inveterate maker and builder whose eyes light up when he talks engineering" claims he's solved all efficiency and and storage problems with super-secret technology. Incidentally, he's also the CEO of the company and probably paying for the piece:

>To date, most hydride fluids have been less energy dense than compressed hydrogen, and far short of fossil fuels. They weigh too much for the energy they provide. Johnson thinks he’s cracked both problems. He won’t reveal the details of the hydrides involved, but he’s got the power-to-weight ratio high enough to beat lithium-ion batteries (which are very heavy) and the hydride bond weak enough that it can be broken using only the redirected waste heat from the engine (no added heat or pressure required).