Word: tungsten
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Dates: during 1950-1959
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...worked for three years, introducing various gases into an incandescent lamp bulb just to see what would happen. In 1912 he made his first important discovery: an electric bulb filled with nitrogen was more efficient than the so-called "vacuum" bulb, since the gas retards evaporation of the tungsten filament. It displaced the old vacuum bulb, saved users of electricity a billion dollars a year...