WELCOME to the cryogenic filling station. You drive in, insert your credit card in a slot, touch the screen and enter your personal identification number. Then you wait. A robot arm emerges out of the ground, finds the cap of the fuel tank and removes it. A nozzle starts disgorging liquid hydrogen at -253 °C. After three minutes, the robot refits the cap, withdraws and you drive off with Born to Run blaring out from the CD player.