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The Gravitylight: Lighting for Developing Countries

by bill - 2012-12-30 - ( education / tech / help / charity )

GravityLight: lighting for the developing countries on Vimeo.

This is so cool!

GravityLight is a revolutionary new approach to storing energy and creating illumination. It takes only 3 seconds to lift the weight which powers GravityLight, creating 30 minutes of light on its descent. For free.
And here is a "less old" link.Their second fundraising campaign has also expired, but you can still how well they did.

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