1,093 Light Bulb Moments: The Many Inventions From The Wizard of Menlo Park

Not every Thomas Edison invention turned to gold. In 1893, after he sold his stake in General Electric, Edison invested the money in an enterprise designed to supply iron ore to U.S. steelmakers. As usual, paying attention to every detail, he “designed his own studded crushers that enabled the use of larger boulders lifted by the world’s largest steam shovel,” according to InSight, a magazine published by the Institute of Electrical and Electronics Engineers.