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What did John Barrow and Frank Tipler propose in the final anthropic principle?

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In their work on the anthropic principle, physicists John Barrow and Frank Tipler proposed the "final anthropic principle." They suggested that the universe is structured in such a way that an infinite amount of information can be processed by computers into the indefinite future. Essentially, this principle posits that the level of complexity required to constitute life can persist forever.1