The Gravitylight: Lighting for Developing Countries
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.
blog version similar posts here ... and elsewhere
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