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GravityLight: lighting for developing countries

 
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PostPosted: Fri Dec 21, 2012 6:54 pm    Post subject: GravityLight: lighting for developing countries Reply with quote
GravityLight harnesses the power of gravity to provide a realistic alternative to kerosene lamps. The $5 light requires no fuel or batteries, and it takes only 3 seconds to lift the weight which powers GravityLight, creating 30 minutes of light on its descent.

There are currently over 1.5 billion people in the world who have ...read more
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