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d340e03 Physicists often quote from T. H. White's epic novel , where a society of ants declares, 'Everything not forbidden is compulsory.' In other words, if there isn't a basic principle of physics forbidding time travel, then time travel is necessarily a physical possibility. (The reason for this is the uncertainty principle. Unless something is forbidden, quantum effects and fluctuations will eventually make it possible if we wait long enough. Thus, unless there is a law forbidding it, it will eventually occur.) science heisenberg-uncertainty-principle terence-hanbury-white uncertainty-principle werner-heisenberg t-h-white the-once-and-future-king time-travel physics Michio Kaku