Ice Age Theory : Louis Agassiz, Swiss-American, 1840.
Insulin : (first isolated) Sir Frederick G. Banting and Charles H. Best, Canada, 1921; (discovery first published) Banting and Best, 1922; (Nobel Prize awarded for purification for use in humans) John Macleod and Banting,
1923; (first synthesized), China, 1966.
Internet : Advanced Research Projects Agency (ARPA) at the Dept. of Defense, U.S.A., 1969.
Iron, Electric : Henry W. Seely, U.S.A., 1882.
Isoes : Frederick Soddy, England, 1912.
Jet Propulsion : (engine) Sir Frank Whittle, England, Hans von Ohain, Germany, 1936; (aircraft) Heinkel He 178, 1939.
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