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Thomas Edison (43)... two thousand different materials in search of a proper filament for the light (44)… His assistant complained, "All our work is useless." Edison replied (45) ..., "Oh we have come a long way and we have learned a lot. We know that there are two thousand elements which we cannot use to make a good light bulb."
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S. Sumiati
Master Teacher
Mahasiswa/Alumni Universitas Pendidikan Indonesia
14
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