Thomas Edison was a real example of a man who teaches us.
Edison tried two thousand different materials in search of a filament for the light bulb. When no one did not work satisfactorily, his assistant complained, all work was useless. We have not learned anything.
Edison very confidently said, we have gone a long way and we have learned a lot. We know that there are two thousand elements which we can not use to make good bulbs.
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