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My memories of ancient light meters involved a battery, but I might be conflating those memories with me plugging in a cadmium sulphide photocell to my shiny new analog multimeter. I was like 7 at the time, so who knows.

OTOH I -need- a salad powered calculator.




"I need a salad powered calculator" why?,you have one already..... :) though strictly speaking it's omniverous




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