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quote:Originally posted by vanvinhhoangIf we consider space-time as an unique object, do you think that time is a strange piece. In normal thought, we can not accept an ideal that we could inverse the dimentional of time, everything happen from past- present-future, while all the another componient of space can be inversed with no problem. Nowaday, physics has reached many progresses. But as you know, we get some big problems, i.e the Unification Theory, dark matter, no evidence about SUSY, ... So that a question here is that the reason maybe the absence of constraints in which time must be forced to pass only one direction. But if these constraint will be discoveried, so how about the CPT invariance.