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Offgrid Pocket Calculator

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

 
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Location: Victoria British Columbia-Canada
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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.
 
Story like this gets better after being told a few times. Or maybe it's just a tiny ad:
A rocket mass heater heats your home with one tenth the wood of a conventional wood stove
http://woodheat.net
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