Cell phones powered by voice. Someday

According to the BBC, "self-powered" devices, such as phones that charge when you speak into them, are one step closer to reality.

Engineers have doubled the efficiency of piezoelectric devices that harvest energy from movement and vibration.

The trick lies purely in the size of the devices: a narrow range of thicknesses around 5,000 times thinner than a human hair.

emily | 8:03 AM | Technology |
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