Microwave signals turned into electrical power

Using all the microwaves around us to generate electrical power?

Gigaom

http://www.bbc.co.uk/news/technology-24897584

There is energy in the air all around us, traveling in the form of sound, Wi-Fi and other signals. Duke University researchers announced they successfully converted microwaves into electricity, which could be used to power electronic devices. Their system is about as efficient as a solar cell, and they hope it could someday be built into mobile phones.

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