The Miracle of Magnetism

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Legend has it that in 1780, while dissecting a frog, Italian Luigi Galvani simultaneously touched its muscles with a steel scalpel and a copper hook-holder. To Galvani’s amazement, the dead animal’s paw twitched. The reason was the electric current generated in the galvanic pair created by the instruments: it caused the muscles to contract. Galvani …

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