Good ideas and conversation. No ads, no tracking. Login or Take a Tour!
Or you can believe that time travel only works by creating parallel worlds. Whenever anyone goes back in time a new branch forms so that the time line they are leaving is preserved. You then have to accept that we are in either the original timeline (un-likely), that the timeline we were in was changed in a way that we can percieve (for example someone went back in time, creating a new timeline, and then was immediately eaten by a dinosaur, causing no lasting effects that we could notice), or that time travel isn't possible. http://en.wikipedia.org/wiki/Many-worlds_interpretation#Time...