Though he would later be acclaimed as one of the greatest inventors of history, Thomas Edison’s school career lasted three months. The teacher believed he was incapable of learning anything and sent him home. Edison’s mother taught him, and he was on his way to a lifetime of overcoming what seemed to be insurmountable obstacles. Among his most famous inventions were the commercial incandescent light bulb, the phonograph, and the fluoroscope. Most of his inventions required months if not years of dedication to overcoming obstacles before seeing any results.