An AirPower wireless charger is displayed during an Apple launch event in Cupertino, California, U.S. September 12, 2017. REUTERS/Stephen Lam
Smartphones have been adopted by the billions worldwide in no small part because they are wireless. But they're not entirely so.
They still use wires to draw electricity – whether from a coal-fired power plant hundreds of miles away or a rooftop solar panel.
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