Gravity Light
A non-kerosene light powered by gravity, from engineering.com.
With the introduction of LED technology over the last 15 years we have seen a revolution in lighting products. With their long lifespan and low energy usage they have become a boon to developing nations. This and expanded cellphone usage will be tech that help millions of the world’s poorest.
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- This $5 lamp powered by gravity (just destroyed its funding target) (venturebeat.com)
- Gravity Light (sciencedatacloud.wordpress.com)