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Quantum Mechanics
What is the central mystery of QM?
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from the website http://www.bottomlayer.com/bottom/argument/Argument4.pdf
… it appears that the change from wave to particle takes place not upon mechanical interaction with the detecting device, but upon a conscious being’s acquiring the knowledge of the results of the attempt at detection.
Although not entirely free from doubt, experiment seems to indicate that the same experimental set up will yield different results (clumping pattern or interference pattern at the projection screen) depending entirely on whether the experimenter chooses to learn the results of the detection at the slits or not.
This inexplicable change in behavior has been called the central mystery of quantum mechanics.
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