I’m pretty sure that this is the most off-topic in this off-topic forum. Anyway, IMO there’re several probabilities about time order. The first one is the linear timestream, in this case, there’s only one timestream and the idea of “time traveling†in this scenario is turning back time. Every single disturbance that occurs as it shouldn’t be would cause a difference or the changing of history. Let’s make a scenario, a person made a time machine, he came back to the past (before he was born) and killed his own mother. The logical explanation is that person would vanish, wouldn’t he? But if he vanished, then there’s nobody who killed his mother, thus his mother was still alive cause the effects wouldn’t be able to exist without the cause. If the mother was never killed, the history would never change and he would give birth to an inventor of time machine and would be killed by him and we would be stuck in an infinite loop. Anybody has a thought? Is there any problem-solving for this paradox?