Gravity Powered Light for the Future
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With the development of a LED gravity-powered light, developing countries can now enjoy access to reliable lighting. This LED lamp works by using the gravitational pull of a weight hanging from the lamp. The lamp does not require any batteries or fuel for generating energy, which makes it clean and is potentially affordable for those with low income.
Link: http://www.smartplanet.com/blog/bulletin/how-a-5-gravity-powered-led-could-revolutionize-cheap-lighting/7924
Date & source: December 12, 2012, Smartplanet
Author: Charlie Osborne
