Gravity Light: LED lamp powered by sand or rocks for the poor villages of Africa

Gravity Light: A generator powered by weight of gravity, which has been built for the developing and poor countries.  It does not use any battery nor any expensive stuff.  It would cost the people $5 to buy and there is no running cost.  It comes with a durable bag, which can be filled with stones or sand and the weight of that creates the power to light the lamp or even run a radio. It is an incredible idea indeed!

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