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If the characters in computer games attain consciousness one day, they probably won't believe that they are living in a world that's entirely described by the 0s and 1s of computer code. But something similar might go for us, too. Max Tegmark, a physicist at MIT, argues that the Universe we live in is not just very well described by mathematics, but that it is a mathematical structure. It's an idea he explores in his book, Our mathematical Universe, and about which he talked to us in our recent interview in London.