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I have a hard time wrapping my head around "past" and "future" as existing. It seems to me that they can only exist in the "replayed video" of the memory and "projected video" of the future. Is it not a fact that the current moment is all we have? It's hard to reconcile though, given that we can't possibly ever be "in" the moment given that we exist (from at a perceptual level) 80 milliseconds in the past.
Can someone explain Einsteins "fourth" dimension in lay terms?