Learning | Mistake

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…