How to evaluate the life of the great inventor Edison?

Edison had such failures, but people's warm welcome to him was totally deserved. His contemporaries called him "the most useful American", and he changed their lives and ours with his inventions: in addition to incandescent lamps, he also discovered the phonograph, movies, electric tractors and batteries; In improving the telephone; They all played a role in discovering Edison's utility. And this "utility" is a rare treasure, which led to the emergence of electron tubes, and then led to the emergence of radios, radios and televisions. He also improved the capacity of American industry through inventions such as multiplex telegraph transmission, cement machine and mimeograph. When he died, he tried to extract rubber from the giant hybrid sunflower for fear that the supply in the Far East would be cut off and the United States would be isolated. On average, during his adult life, he made a patentable design every two weeks.