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A comment on Stacking concrete blocks is a surprisingly efficient way to store energy. Parent comment

Re:Stacking concrete blocks is a surprisingly efficient way ... by aruggirello on Saturday August 18, 2018 @04:38PM (#17790517)
It's definitely feasible IMHO:

http://www.lowtechmagazine.com/2018/05/ditch-the-batteries-o...

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