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David Mermin's famous article ``Is the moon there when nobody looks ? Reality and the quantum theory.'' (Physics Today, pages 38-47, April 1985) describes a gedanken experiment which demonstrates the strange and surprising behaviour of quantum systems in entangled states.
Here is a brief description of an applet which illustrates his gedanken experiment. In order to understand the experiment it is best to read Mermin's article first.
| EPR Experiment |