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The Limits of Gravity
The holographic principle is the idea that not all points in space are independent from each other. Once you know there's gravity, once you know there are black holes, okay? That's kind of a new limit on how much you can do in any one region of space time. As in quantum field theory, we talk about an ultraviolet cut off. We say at very, very short distances, we don't know what's going on.