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| LIGHT VIA...GRAVITY? - YouTube This is #CoolAsShit .. this #LED lighting system is powered by a 30 pound bag of rocks. All you need to do is hoist the bag to the top with a tug, and the slow decent over 20 minutes is enough to power a 3 light system. The inventors developed this for 3rd world countries where over a billion people use toxin emitting #kerosene lamps . It's called the #GravityLight available on #Amazon . &neo 2017-08-04 12:45:47 |