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This Ingenious $20 Lamp Gets All Its Energy From Gravity

Three years ago, GravityLight raised a ton of money through crowdfunding. Then it was time to actually make it work.

The ingenious GravityLight—a light that gets all its energy from its own weight—first appeared about three years ago. We wrote about it as it was launching on Indiegogo and went on to raise $399,590.

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