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The fabric of reality
The double slit experiment is introduced early in the book and is central to his arguments for the multiverse - he shows how this leads to the conclusion that light is being influenced by photons from other universes. He then links this in an intruiging way to the other three strands of his philosophy, which are evolution, epistemology and the theory of computation. He goes via virtual reality, time travel and his own solution to the problem of induction, and concludes that we aren't just here by chance, rather intelligent beings are an integral part of the universe.