A physicist believes he may have solved the notorious "grandfather paradox", suggesting that time travel to the past may not be ruled out by this particular branch of physics. First off ...

Vanderbilt University physicist Lorenzo Gavassino isn't so sure this is as big an obstacle as time-traveler pessimists have ...

This is a paradox, an inconsistency that often leads people to think that time travel cannot occur in our universe. [L]ogically it's hard to accept because that would affect our freedom to make ...

Einstein’s general relativity predicts the existence of closed timelike curves—space-time loops allowing theoretical travel back to past events. In a rotating universe, space-time could warp ...

Paradox! is a brand new puzzle platformer inspired by the '90s era of cartoons, with a free demo coming out later this month ...

Whether it's preventing your own conception or handing the blueprints to a time machine to a younger version of yourself, generating a paradoxical sequence of events is a big no-no that cancels out ...