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ithou

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  1. Learning...

     

     

     

     

     

    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

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