In 1780, Luigi Galvani discovered that when you put electrical current through a severed frog leg, it’d twitch. This would eventually lead to the development of the Galvanometer.
Hence imagine you are doing some home improvement, and want to verify whether a wire is live. But alas, you don’t have a galvanometer handy – and while you could turn off the power mains, well, that’s too much trouble.
How about using a test light? Alas! You don’t have one and the stores are closed…
Instead! Head to the nearest pond, and catch yourself a frog. Or even better, catch yourself a few, because you’ll need to replace your frog’s leg galvanoscope every two days…
