What material did Thomas Edison use for the carbonized filament in his first commercially practical light bulb?
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Thomas Edison tested thousands of materials before finding success with carbonized cotton thread in October 1879. This fragile filament burned for over thirteen hours, proving that electric light could be long-lasting and affordable for the general public. Photo: Louis Bachrach, Bachrach Studios, restored by Michel Vuijlsteke, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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