 We have two different levels. Well, yeah, there's too much water, too low. There's too much oxygen. I mean, you can have too much and too low of anything. But it's not practical. It's not going to happen. Okay. And arthritis. We spend each year, George, $626.8 billion a year just to treat the symptoms of arthritis, not to prevent it or cure it. $626.8 billion.