Power the Stereo by Driving Through Potholes

By drawing energy from vibrations, tiny sheets of piezoelectric material can provide free power to anything that moves or shakes. The battery-less sensors can take the motion from a car on bumpy asphalt or a loaded clothes dryer, for example, to give supplemental energy to a device.
Piezoelectric technology has been�around since the late 19th century [...]

Source: http://www.wired.com/gadgetlab/2011/08/ambient-vibration-power/

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