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Now harness the power of gravity and rain. 🙈
You hang a tub from a rope outside. The rope is connected to a set of gears with a super high ration. Connect the gears to a generator. When it rains, the tub will fill with water and will add to the energy going into the generator. Reset it by draining the water from the tub when it touches the ground, and then putting the tub back in the original position.