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Regarding quantum mechanics and such things, I never understood exactly how simply observing the light bouncing off the quantum particle can change the particle itself, in other words how measuring the particle changes its state; I have a guess, but I'm not the scientist! How does this happen?

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Regarding quantum mechanics and such things, I never understood exactly how simply observing the light bouncing off the quantum particle can change the particle itself, in other words how measuring the particle changes its state; I have a guess, but I'm not the scientist! How does this happen?	1