The Rules Of Movie Time Travel Explained In 90 Seconds: Watch — mtv.com

Time travel is impossible everywhere except Hollywood, where it seems to come up at least a few times a year (just take the new Tom Cruise flick “Edge of Tomorrow”). In fact, it’s so common in movies that “time travel movie” might as well be its own genre. And there’s one thing these movies have in common other than defying the laws of physics: the characters love talking about the rules of time travel.

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