The Right Pinky*
According to theoretical computer science, everything that is computable can be computed by one of the simplest machines in existence—the Turing machine. This gadget can spend all of eternity chugging out desired results, but it will do so guaranteed. But can the universe be computed? Some physicists think so. Combining the Turing thesis with discoveries in quantum theorectical computing, it is postulated that all possible universes could be simulated. Everything could be just a mark on the quantum tape, but we would never know it.
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* Adapted from a chapter title in Neal Stephenson's In the beginning ... was the command line.
Simulating all universes on a Quantum Turing Machine.
