GravityLight: lighting for developing countries.
Designers from London have developed a realistic alternative to Kerosene lamps by harnessing the power of gravity."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."
Author Uta Mühleis, 12.22.12