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Offgrid Pocket Calculator

 
Adrien Lapointe
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No electrical power required, no batteries... a mechanical calculator. Really cool, but not cheap ($1k on ebay).

 
Dale Hodgins
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At a fruit market in Chinatown, there is a lady whose hand speed is faster than Bruce Lee. Her abacus skills put most modern inventions to shame. Might not work so well as a mortgage calculator.
 
Because there is no spoon. Just a tiny ad:
better than composting toilets
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