On my usual thinking escapades about future science and progression, I like to think about when true virtual reality like you saw a glimpse of in Minority Report and other movies, where fantasy can be "plugged in" directly to the brain so we can see fiction as fact, and other such things...in this same mindset, I wonder if we will ever be able to simulate our universe; so even if we cannot travel back in time, we would be able to do so through VR and actually BE in the past...wherever --and whenever-- you wanted...find out all of the great mysteries of history (nice rhyme) and such. I realize this is way way future science, but I just wonder if it WILL EVER be possible? I think that it relies on if our universe can be broken down into "linear" math with no paradoxes or randomness. If it's true what they say how our brains are just effected by biological responses and cause and effect, and that we actually do have a "destiny" if we could figure out the math behind it. I was thinking though what would happen if this simulation were invented, and someone wanted to look at their future...how would this be possible? Let's say some looked to their future, saw something they didn't like, and changed it. Well that's not possible because then it wouldn't be the future, would it? The future would be changed and the simulation would be wrong, as it didn't predict the future.... It's a paradox.