Thomas Edison was born on February 11th, 1847 in Milan, Ohio. When he was at school, his teacher considered him to be a slow student. Because of hearing problems, Edison had difficulty following the lessons. But with only three months of formal education he became one of the greatest inventors and industrial leaders in history. Edison's most famous invention was the electric light bulb. He also invented the phonograph, and made improvements to the telegraph, telephone and motion picture technology. Edison had a special life. He married twice with five children. He loved books, had excellent memory, and always showed curiosity about science. Although he had hearing problems, he refused to have an operation for his deafness. He said that silence helped him concentrate. He always worked very hard and often had only four hours of sleep every day. He used to say, "Genius is 1 percent inspiration and 99 percent perspiration”. When he died on October 18th, 1931, he was still working on new ideas. 2,Why did Edison have difficulty understanding the lesson class? 3.Was he one of the greatest inventors and industrial leaders in history?