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

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 ...

Whether space-time exists should neither be controversial nor even conceptually challenging, given the definitions of “space-time,” “events” and “instants.” The idea that space-time exists is no more ...

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 ...