Just More Fascinated By The Sentiment - Blog Posts

Physicists often quote from T. H. White’s epic novel The Once and Future King , 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.)

Michio Kaku

Just for your info, actually he’s talking (without quoting) about the Gell-Mann’s Totalitarian Principle:

“Everything not forbidden is compulsory.”

(via scienceisbeauty)