TIL The Turtle, a submarine used in the revolutionary war period, used luminescent fungus to illuminate things such as its depth gauge in a time before the widespread use of electricity

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  1. > Foxfire was used to illuminate the needles on the barometer and the compass of Turtle, an early submarine.[6] This is commonly thought to have been suggested by Benjamin Franklin; a reading of the correspondence from Benjamin Gale, however, shows that Benjamin Franklin was only consulted for alternative forms of lighting when the cold temperatures rendered the foxfire inactive.

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