Katie Hall was shocked the second she saw it: a light-bulb glowing in middle of a room with no wires attached. Looking back, it was a crude experiment, she remembers: a tiny room filled with gigantic cooper refrigerator coils -- the kind you'd see if you cracked open the back of your freezer. She walked in and out between the coils and the bulb -- and still the bulb glowed. "I said: 'Let's work on this. This is the future.'" What's the trick? "We're going to transfer power without any kind of wires," says Dr Hall, now Chief Technology Officer at WiTricity -- a start-up developing wireless "resonance" technology...