Tungsten is used because it has a high melting point and maintains a high strength at high temperatures - like those required to make it hot enough to give off light as a filament in an electric bulb.
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Because it has a very very high melting temperature: 6191F, 3422C. However it is also very difficult to work with, so early light bulbs used carbon for making the filament instead. Around the year 1900, carbon filaments were replaced with tantalum filaments. It was not until about 1910 that it became practical to make tungsten filaments.
To make red light.
If science did not invent light bulbs and technology did not make it possible to make light bulbs then lots of people could not see very well at night
Cocain, to make crack crystals.
Thomas Edison got $3000000000 in his whole lifespan of selling light bulbs