This shockingly simple battery could store energy forever

The inside of Empire Mine Shaft allows access for visitors to see the underground work. There are an estimated millions of mineshafts that descend deep into the Earth all across the globe, making it an attractive and untapped solution for energy storage via gravity batteries. (Credit: Matthew W Cummins/cc-sa-3.0)

Back in the 1950s, 1960s and 1970s, humanity had a golden window to revolutionize how we handled energy all across the globe. The dangers of…

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