Inventer of bulb

It’s all about Thomas Addison. One day he came back from school holding a letter in his hand, he asked her mother that what is written in the letter she replied that yours teachers are saying that your son are genius we cant teach him.
After the invention of bulb, thomas was very happy he was searching for old thing to memorize his mother because at that time she was passed away. He found an old letter in which it is written that your sons in very weak we cant teach him.
That was the latter which was given by his taecher to thomas but one courage of his mother change his life.