 Okay, folks, we've got a couple more things we need to talk about here. Number one is a response. A response is a very specific instance of behavior. We could talk about all sorts of fancy things, but really all you need to know is one instance of behavior. Watch. I waved at you. That was one response, right? So if a lot of waving, though, that's the behavior in question. So I could wave at them, and I could wave at them, and them, and them, and the birds, and whatever else I need to wave to. I could wave at all sorts of things. And Brad looked up because there are no birds. But anyway, that was a whole different thing. It worked. It's funny how people respond to waving. Let's see what else. Oh, a response class, right? That is anything that has the same effect on environment. So I could wave like this, I could wave like this, I could wave like this, I could wave, oh, nope, that has a different effect on environment. So that wasn't the same response class. He was like, hey, what's up? I'd be like, hi, how are you? All sorts of different things that produce the same effect on environment. We call those the same response class. They may be different responses. They may be different actions, but they have the same effect on the world. So they fit into the same little box. We call that box a response class. All right, thanks. See ya, bye. More later.