Time travel stories can be quite complicated, but the original Back to the Future was pretty easy to follow—Marty McFly goes ...

From phone boxes and flux capacitors to black holes and hot tubs, sci-fi has created plenty of ways to explore the fourth ...

Daryl Janzen does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...

First, the good news. Time travel isn't necessarily forbidden by the laws of physics. In fact, the mathematics underpinning Albert Einstein's theories of relativity offer up possibilities via the ...