Genetic Engineering : Stanley N. Cohen, Herbert W. Boyer, U.S.A., 1973.
Gravitation, Law of : Sir Issac Newton, England, c.1665 (published 1687).
Gunpowder : China, c.700.
Gyrocompass : Elmer A. Sperry, U.S.A., 1905.
Gyroscope : Jean Leon Foucault, France, 1852.
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