Release Message:  What happens when a time traveler does things in the past that prevent him from doing them in the first place?

Description:  What happens when a time traveler does things in the past that prevent him from doing them in the first place? A temporal paradox, time paradox, or time travel paradox is a paradox, an apparent contradiction, or a logical contradiction that is associated with the idea of time and time travel. Temporal paradoxes fall into two broad groups: consistency paradoxes exemplified by the grandfather paradox; and causal loops.