One of his biggest struggles was finding a filament for the light bulb. He tried thousands of different materials in search of a filament. His assistant got frustrated when none of them worked. “We have failed.”, he lamented “We have worked so hard and we have learnt nothing.”

Edison laughed and replied, “How can you say we haven’t learned anything? We now know that there are two thousand materials that we cannot use to make a lightbulb.” Soon after, he invented the light bulb.

one day the farmer called his son and said ”look I shall give everything in charity. I shall not give you anything unless you earn one hundred rupees. for that, i give you three days time.

his son went to one of his friends and borrowed a hundred rupees note from him. then he spent the of the day in eating and sleeping. in the evening he comes back home and gave hundred rupee note to his father.he told his father ” father, I have worked hard today and earned this hundred rupee note. the farmer took the note and threw it aside. ”this is not yours. you have not earned it, he said. the son was not angry at all. he just smiled and walked away.