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Galvani experiment

Luigi Galvani discovered that frog legs twitch when electricity is passed through the muscles, a phenomenon called galvanism that led to the subject of electrophysiology and treatment by electrotherapy. (Source: Wells DA. The Science of Common Things: a Familiar Explanation of the First Principles of Physical Science. New York: Ivison, Phinney, Blakeman, 1859. Public domain.)

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