What if you could predict all future events? A 19th century French mathematician, Laplace, thought you could. If you can predict the position of billiard balls bouncing on a table applying rules of physics, so you can also predict the position of atoms in the universe. Of course you have to know the exact position of every atom in the universe. I don't even know where my ski socks are, much less every other atom in the universe. So a good theory, but it doesn't work. Leplace's idea also conflicts with more modern Chaos theory and Heisenberg's Uncertainty Principal, neither of which I understand. More realistic than Laplace's theory is the possibility of time travel. Einstein's theory of Special Relativity says that objects traveling very very fast age slower than objects on earth and this has since been proved. Wormhole theory also supports possible time travel. There are also theories of parallel universes. We may find out that there really is a Bizzaro world and maybe even a Mr. Mxyzptlyk. (Does anyone remember who he is or can pronounce his name?)