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    *    Overview
 _Is  Quantum Reality Analog after All?_

 Conventional wisdom says that quantum mechanics is a theory of
 discreteness,  describing a world of irreducible building blocks. It stands to 
 that  computersÿÿwhich process information in discrete chunksÿÿshould be able
 to  simulate nature fully, at least in principle. But it turns out that
 certain  asymmetries in particle physics cannot be discretized; they are
 irreducibly  continuous. In that case, says David Tong, author of "_Is  Quantum
 Reality Analog after All?_
 " in the December 2012 issue of
 Scientific American, the world can never be  fully simulated on a computer.

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