Thomas Edison was a serial entrepreneur. He invented a lot of products that became widely used, turned into household names, and changed our lives. He is best known for inventing the light bulb and the phonograph, the former changing drastically how we work and live, and the latter having a tremendous impact on the entertainment industry. Or better yet, creating the entertainment industry. Of course all great inventors usually have a few failures under their belt, in addition to their great successes. One of those failures was ore-milling. But Edison was an entrepreneur. Where others saw failure, he saw an opportunity. Instead of scrapping the factory and cutting his losses, in 1899 Edison went on to form the The Edison Portland Cement Company which used the waste from the ore-milling, fine sand, which he had been selling to cement manufacturers, to create concrete.