Caption:
Artist's impression of the Benjamin Franklin's (1706-1790) investigation of the electrical nature of lightning, made at Philadelphia, USA, in September 1752. Franklin and his assistant are flying a kite in a thunderstorm and Franklin is drawing a spark off the kite string. Engraving from "Le Journal de la Jeunesse" (Paris, 1881). (Photo by: Universal History Archive/UIG via Getty Images)