Board Thread:General Discussion/@comment-74.104.206.83-20130730235710/@comment-22580009-20130925225629

It is also used to say that the original timeline still exists. This becomes a problem though, if people start trying to travel back AND forward, as you will end up in a different timeline because you changed the past. This is the main reason it is not used in all time travel instances. The only single timeline, past affects the future, time-travel game that i can think of that manages to avoid paradoxes and still go in depth, is Chrono Trigger. Personally I prefer that theory, because the multiple timeline theory leaves too much unexplained. Plus, it means that you're actions have no consequences, you're not ruining lives, just branching the timeline.