Una luz de 5$ que funciona con la gravedad que, lamentablemente para eléctricas y petroleras, es gratis http://t.co/qtkDTP4X
December 27, 2012
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This $5 lamp is powered by gravity (and just destroyed its funding target on Indiegogo)
A lamp for $5 that does not require any electrical power source? It may sound like an impossible dream, but two designers in London have built functioning prototypes of GravityLight, a cheap way for people in developing countries t0 light homes, recharge batteries, or power a radio.