Listen now (8 mins) | Thomas Alva Edison is one of the most famous and prolific inventors of all time. Edison, who invented the electric light bulb, has many other inventions to his credit. In addition to the electric light bulb, Edison used to own over a thousand patents for his inventions, which included the phonograph, alkaline storage battery, electrographic vote recorder, and sound recorder. According to Britannica Encyclopaedia, he was the first in the world to start a research laboratory on an industrial scale. It may be difficult to believe that a boy who was labelled as “stupid” and “hard of hearing” and was expelled from school turned out to be a world-renowned inventor.