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ZeroGravitas
on Jan 15, 2022
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GravityLight – Light from the Lift of a Weight
Low tech magazine did an in-depth look at this a while ago:
https://www.lowtechmagazine.com/2011/05/bike-powered-electri...
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https://www.lowtechmagazine.com/2011/05/bike-powered-electri...