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what if, instead of sidewalks, all walkways were replaced with reverse-treadmills? Conveyor belts, that when people walk on, they spin a turbine which makes the power build up in batterys we supply to the grid? just a thought -roadtose
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# ¿ Sep 17, 2014 06:44 |
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# ¿ May 21, 2024 03:15 |