Learn from Mistakes
Thomas Edison tried two thousand differ-
ent 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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