Aristotle said a bunch of stuff that was wrong.
Galileo and Newton fixed things up. Then
Einstein broke everything again. Now, we've basically got it all worked out, except for small stuff, big stuff, hot stuff, cold stuff, fast stuff, heavy stuff, dark stuff, turbulence, and the concept of time.
Writer: The hero travels to the future, has sex with himself then travels to the past and gives birth to himself.
Director: Umm....How's that possible?
Writer: Quantum Physics.
course, that explains everything.