It was, I believe, Thomas Edison, on the light, that they say the man had a knowledge that he could make electricity light. He's the inventor of the light bulb. And he wouldn't even go to bed at night. He would take a sandwich in his hand, and eat his meal, and set there, and figure, and work. Somewhere way back in the back of his mind, something told him he could do it. What is it? It's a key that can open up the way.