GravityLight addresses the fact that more than 1.5 billion people on the planet have no access to reliable electricity. The clean, green LED lamp only requires users to lift a 20-pound weight every 30 minutes. As the weight descends the attached tracks, it powers an internal dynamo which in turn lights the light. It’s the same concept we’ve seen used with hand-cranked gadgets for years, just with less overall effort required of the user thanks to gravity’s help. (via Ingenious Lamp Lights Third World With the Power of Gravity | Gadgets, Science & Technology)
Source: gajitz.com




