Obviously there is no way the universe could be rewound to 100 years ago and restarted with exactly the same initial conditions, so I would like to discuss the question ignoring this impossibility. It is also obvious that Chaos Theory tells us that any finite deviation in initial conditions (no matter how small) would result in a very different universe in 100 years. Since probability seems to rule at the quantum level (which has effects at the classical level), I would expect the restarted universe to be different even if the initial conditions of 100 years ago were duplicated exactly. Id est: At a very fundamental level, I do not believe in determinism. I think my view is supported (not proved) by data relating to radioactive decay and other quantum level processes controlled by probabilistic laws. At least the data resulting from such processes indicate that probabilistic laws rule at the quantum level. What are the views of others here? If you disagree, do you know of any evidence supporting your view?