What Bostrom is asserting is that there are three possibilities about the future, one of which must be true. The first possibility is that the human race becomes extinct before reaching the stage where such a high-level simulation could be built. The second possibility is that humans do reach that stage, but for whatever reason—legality, ethics, or simple disinterest—no one ever tries to simulate the complete experience of civilization. The third possibility is that we are living in a simulation right now. Why? Because if it’s possible to create this level of computer simulation (and if it’s
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