Probably Thomas Edison’s best-known invention is the electric light. But the familiar light bulb is only the most obvious element of Edison’s accomplishment. He also created from scratch a delivery system for his light. His invention literally changed the world, putting the power of electricity at our fingertips. In 1878, Edison said: “The electric light is the light of the future. And it will be my light.” This is the story of how he and his team raced against competitors to make good his word.