Randall-Sundrum Model
A theory of the Universe which postulates that we live in a five-dimensional spacetime, though we are confined to a four-dimensional Slice of it. This model is still being explored as an accurate description of the Universe in which we live.
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Inspiration
Now, here, you see, it takes all the running you can do, to keep in the same place. If you want to get somewhere else, you must run twice as fast as that.