Radio waves offer energy-generating potential

07/18/2010 | New York Times (tiered subscription model), The

Radio waves captured from the air have the potential to replace batteries in some instances, such as a hard hat that issues a warning beep when near heavy equipment. It's a notion that has been around for a while, but has only recently become feasible. "Silicon technology has advanced to the point where even tiny amounts of energy can do useful work," Intel engineer Joshua Smith said.

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New York Times (tiered subscription model), The

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