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GLOBAL BRAINS

Global Brains: GravityLight

Often the simple ideas are the best. That's especially true for people who can't afford the most up-to-date technology. With that in mind, Martin Riddiford and Jim Reeves invented the GravityLight.

The London-based duo had the idea of creating light from gravity. Their lamp functions just by hanging a weight on it. All you need to do to get the lamp to work is lift the weight every 30 minutes.

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