This $5 Lamp Is Powered Solely by Gravity

There aren't any batteries or fuel in the $5 revolutionary lamp called the GravityLight.

The ultra-cheap lamp was created as a replacement for expensive and highly polluting kerosene-powered lanterns, which are widely used in developing countries. London-based designers Martin Riddiford and Jim Reeves have been working on the GravityLight as a side project for the four years.

For the 1.5 billion people in the world who live off the electric grid, homemade kerosene lamps are the norm. But, the kerosene can eat up 10% to 20% of a family's household income, according to the designers. Fueling these lamps with kerosene is also extremely dangerous. Men, women and children are regularly exp…
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