Welcome to our section on Predestination Paradoxes, where the fabric of time gets all wobbly and stuff.
It's a paradox, see? You can't change the future because it's already been predetermined, but then you go back in time and change the future. Or do you? Or maybe you don't.
Confused? Don't be. It's just timey-wimey stuff.
Learn more about The Grandfather Paradox
Or, if you'd rather not, you could check out our section on Free Will Paradoxes, where it's all about whether you're a pawn or a king.
Or maybe, just maybe, you're a Novikov's Theorem kind of person. (Don't ask.)