Larry Niven the SF writer had a short article on this. If time travel existed someone would go back in time and change something which would change history. And in the new timeline some one would change something else. This would keep happening till the current time line wouldn't have time travel.
[–] crazy_eyes 1 point 0 points 1 point (+1|-1) ago
Bunch of nonsense. I am a time traveler. I can prove it is possible