 If optimal, let's take blood pressure again. If blood pressure is 120 over 80, if that's normal, right, or some right around there is normal, if I told you, okay, well, your blood pressure is 160 over 90, you wouldn't think that. You would automatically go, oh, that must not be normal. Something's wrong. Same with your brain waves. It's like the alpha waves or whatever waves we're referring to. Now, each different brain wave is associated with a different function of the brain, and it's connected, and this is very well documented in the science.