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 know
that there are two thousand elements which we cannot use to make a good light
bulb.”
Moral: We can also learn from our
mistakes
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