It may just be the best idea ever to come to a man in the bathtub since Archimedes. While taking a soak, inventor John Shepherd-Barron devised what is hailed as the world's first automatic teller machine, although his claim to the title is a matter of dispute. He pitched the device to the British bank Barclays. They accepted immediately, and the first model was built and installed in London in 1967. Though the machine used pin numbers, a concept Shepherd-Barron also claims to have invented, it was dependent on checks impregnated with the (slightly) radioactive isotope Carbon 14 to initiate a withdrawal, as the magnetic coding for ATM cards was not yet developed. One other difference with its ubiquitous modern counterpart? It didn't charge a fee.