Thomas Edison tried two thousand different materials in search of a filament for the light bulb. When none worked satisfactorily, his assistant complained,
“All our work is in vain. We have learned nothing.”
Edison replied very confidently,
“Oh, we have come a long way and we have learned a lot. We now know that there are two thousand elements which we cannot use to make a good light bulb.”
Source : www.islamicoccasions.com
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so..byk2 la wat keslahan.. :D
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