Time travel is a sci fi plot staple...no one ever seems to get it compltely right though. I was watching the final episode of Star Trek Voyager last night and kept thinking to myself "How in the heck does this work" lol.

The problem with temperal mechanics is that its all theoretical...theres no way to know how exactly time travel works until we actually acomplish it. It isn't anything I'd like to mess with though!