(The “Bootstrap Paradox.”) Could a time traveler truly influence time if their presence in the past means they’ve already time traveled? (The “Predestination Paradox.”) Could a time ...

Trick or treat, smell Harry's feet / Give him some good pizza to eat / If you don't, he doesn't care / He'll rip you in half with his unearthly strength. That's how the old human rhyme goes, right?

The “predestination paradox” — which occurs when a time traveler becomes directly involved in the events he or she is trying to change — has provided the basis for such classic science fiction films ...

Based on Robert A. Heinlein's science fiction short story All You Zombies (1959), Predestination is an ambitious attempt to explore the paradoxes and complicated casual loops caused by time travel.