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And this wave doesn't care about physical barriers. In quantum mechanics, it's often referred to as potential barriers, which is called a barrier. And some of that wave actually shows up on the other side of the barrier wall. And therefore, there is now a probability that that particle on one side will just appear on that other side. So what would happen front, because this wave function can appear on the other side now, and this wave can appear on the other side, that particle can now have a problem that is showing up on that first slide. Because it's a wave function, it can appear in places where it's unexpected.