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``But what he does is he leaves he leaves the jar with the fleas, with the lid on for a period of time. And a couple days later, he comes back to the fleas in this jar. He must have put some type of food or something in there. But he puts he he comes back and then he observes these fleas in this jar, and what he notices is they have conditioned themselves to no longer hit their head on the lid of the jar. Still jumping, but they've conditioned themselves because who wants to bang their head over and over and over again. Right? So they've conditioned themselves just to jump, just to under the height of the lid on the jar. So then what the scientist does is he takes the lid off. And guess what happens? They don't jump out because they have conditioned themselves to know that there's a lid there. And so they still feel that even though the lid has been removed, that they've conditioned themselves this way to jump only the height of where that lid was.