Since its introduction in the nineties, USB has changed the world. It has become the universally accepted standard and replaced hundreds of earlier interfaces, such as serial and parallel ports and power chargers. It has revolutionized storage as much as it has revolutionized connectivity, with the arrival of USB sticks and external hard drives. USB cables are the nerve network, linking together the brain of your PC and the peripheral "organs". But how much do you know about the specifics of this technology?