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The Simulation Hypothesis
The Simulation Hypothesis, originally proposed by Niklas Boström, argues, as its name states, that we live in an artificial reality. Much like playing a video game like the Sims, in which the characters themselves evolve to create their own computer games with their own little worlds inside of them, and those new imaginary beings in turn create their new world and so on. In theory, the process could be repeated ad infinitum.