(CNN) -- Katie Hall was shocked the second she saw it: a light-bulb glowing in the middle of a room with no wires attached.
Looking back, it was a crude experiment, she remembers: a tiny room filled with gigantic copper 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.'"
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