To know reality, one must confront the quantum. It is how our world works at the deepest level. What's the quantum? It is bizarre, defying all common sense. Particles in two positions at the same time. Spooky action at a distance. It would sound absurd if it weren't true.

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Wojciech Hubert Zurek is a Polishborn naturalized American theoretical physicist and a leading authority on quantum theory.

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