Here's a great idea that's being crowdfunded on Indiegogo right now. A gravity powered light that's cheaper than solar.
As the site says: "GravityLight is a revolutionary new approach to storing energy and creating illumination. It takes only 3 seconds to lift the weight which powers GravityLight, creating 30 minutes of light on its descent. For free."
I love those last two words; for free. Below is a video about GravityLight.
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