[quote name='Backlash']I don't think about Time Travel a whole lot, but if I don't want to worry about paradoxes and such, I usually just imagine an infinite number of parallel dimensions at any given instant. These are branched off of different ancestors based on whatever happened in the past, so that the whole structure is like a tree (in CS terms, or even just the basic real-life tree analogy): there's one common instant at the beginning of the universe, and then different actions cause different parallel dimensions from there, and so forth. In a book/game where someone goes back to the past and then changes something or takes some action, and then the reader/player goes "back" to the future, you just end up in a different dimension than the original one, though both still "exist." Simple.[/QUOTE]
That still doesn't fix all paradoxes, for instance consider you go back in time and say for instance change something that would prevent you from going back in time in the first place, what happens to the you who time traveled? Does that parallel dimension then exist where there are now two copies of you and there is no effect on the you who time traveled but now couldn't have, or does it simply wipe out the time traveling you in which case you couldn't have possibly have existed to cause whatever change that caused the time traveling you to not exist?
Another interesting thing, is what if you go back in time to only a couple minutes before you went back in time, and each copy of you then goes back in time to the same exact point, now there are 4 copies of you, and you could continue this until there were infinite copies of you (or anything really).