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Well, what's interesting is that according to the General Theory of Relativity, the universe "consists" of 4-dimensional "spacetime" (3 dimensions of space, and 1 of time) and all four dimensions are essentially equivalent and interchangable. It's rather a mystery which, as far as I know, nobody has yet come up with a good explanation for) why it is that we can perceive and freely move through the three spacial dimensions, but can only perceive the "present" and move at a fixed rate through the temporal dimension.
Fun stuff to think about!
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