 My question is, is it going to go on forever? Or at some point, we're going to run out of ways to make things better? We might double from where we are now, but we're not going to be tripling and quadrupling it because there are physical limits. I mean, will a car go a million miles an hour? No. It just won't. It's not going to happen. For the light bulb, at least, John says, we may actually be near the end.