The perspective – Thomas Edision

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.”

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