MIT researcher performs Gedankenforschung (thought experiment) into wireless recharging: Using resonance, or the tendency of things in nature to vibrate cyclically at certain frequencies--whether metal buzzing from low bass notes or high-frequency EF causing magnetic fields to rotate--the scientists believes its feasible to use a kind of high-powered induction field to allow a power source to charge a battery. Unlike induction, which requires close proximity, the prof thinks that EF loops, producing resonance harmless to other devices and to people, could hang from ceilings or on pipes above a highway. He expects practical results of testing his ideas within a year.