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

Predestination doesn’t waste time trying to explain the time travel technology, and it doesn’t need to, because it’s so coherent and straightforward, you naturally see that it makes sense right away.

Time machines may seem better suited to science fiction than the physics lab, but experts say this futuristic technology ...

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 ...