Ready to do a good deed for the day and maybe get a cool new product for yourself? The Gravity Light gives you that opportunity with a light that is powered entirely by gravity using a bright LED bulb. Simply fill the sack with rocks and earth, use it to hang the light, and you’ve got an ultra-white source that never needs a battery.

The team behind this is developing it for lighting in third world countries. Their goal is to use the IndieGogo project to get costs for villagers in Africa down to less than $5. The project has raised $400,000 for that purpose, and it promises a long-term benefit in weaning developing countries off the risky and high-cost kerosene. Also, the Gravity Light doesn’t attract mosquitoes, so it’s great for your outdoor living area.

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