A scientist has mathematically proven the physical feasibility of paradox-free time travel. But once you go back, you might ...

Have you ever made a mistake that you wish you could undo? Correcting past mistakes is one of the reasons we find the concept of time travel so fascinating. As often portrayed in science fiction, with ...

Have you ever wished you could turn back the clock to avoid a silly mistake? Or daydreamed about riding shotgun with Marty McFly — the character played by Michael J. Fox in the film Back to the Future ...

Before you hop in a DeLorean or fire up a wormhole, let’s get something straight: Time travel already exists — in small, surprising ways. Thanks to Albert Einstein, we know that time isn’t a rigid ...

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 ...

Time travel is one of the hallmarks of science fiction, but many time-travel-based movies have plots that leave one with a headache just thinking about them. What if you could travel into the past, ...