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Time is not a material thing. Our units of time actually measure movement, i.e. if there was no movement the concept of time would be meaningless. Talk about going back in time is not merely science fiction, it is, in fact, more a matter of fantasy, of imagination disengaged from reality. Understanding science is increasingly important but to move forward intellectually we have to accept that simply saying "it pleases me to believe in delusions" is not helpful.