"' 1791 "': Luigi Galvani discovers galvanic electricity and bioelectricity through experiments following an observation that touching exposed muscles in frogs'legs with a scalpel which had been close to a static electrical machine caused them to jump.
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"' 1799 "': Alessandro Volta, following Galvani's discovery of galvanic electricity, creates a voltaic cell producing an electric current by the chemical action of several pairs of alternating copper ( or silver ) and zinc discs " piled " and separated by cloth or cardboard which had been soaked brine ( salt water ) or acid to increase conductivity.
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