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The mind-bending truth behind time travel loops explained

Thomas Mulligan explains the complex nature of time travel by analyzing the inconsistent causal loop (the grandfather paradox ...
NPR

What does it take to get time travel right in movies?

This month marks 40 years since Michael J. Fox, as Marty McFly, jumped into a souped-up DeLorean and went back in time, putting his very future existence at risk. (SOUNDBITE OF FILM, "BACK TO THE ...