When electricity was considered an imponderable substance, it was thought to be some sort of intangible fluid. Because of that, many electrical terms are based on hydraulic analogies like electric current and the flow of electricity.
Okay, it's not so much something I learned as it is something I just realized and thought it was cool.
Even cooler is the realization that even today we still have imponderables. Like electricity and heat in the 16th century they are mysterious substances that we barely understand and can't even detect except through indirect observation of their effects on the real world. Substances like Dark Matter and Dark Energy.
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