GravityLight: Gravity Powered LED Light.

GravityLight - Gravity powered LED lightWhat’s not to like about the GravityLight? It harnesses gravity to power an LED light for 30 minutes with just one lift of the included weight bag. The creators of the GravityLight, Martin Riddiford and Jim Reeves, are currently on Indiegogo raising funds to expand production. Their goal is to manufacture and promote the GravityLight as an inexpensive alternative to kerosene lamps in developing countries. [Grist]