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   Schrödinger's cat

   noun

   • 1. a cat imagined as being enclosed in a box with a radioactive source and a poison that will be released when the source (unpredictably) emits radiation, the cat being considered (according to quantum mechanics) to be simultaneously both dead and alive until the box is opened and the cat observed: "the talk promises to demystify all the secrets of quantum physics, including Schrödinger's cat, Heisenberg's Uncertainty Principle, and parallel universes"

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