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Yes, I have heard of the experiment but must admit have never done it myself, I have to buy some more bullets for my electron gun some day!
It raises some interesting questions and concepts. The effect caused by observing the electron has created some very "unscientific" sounding logical conclusions, ie. because matter changes how it acts if it is observed could lead you to the theory that the universe only exists because we observe it, if it was not observed, the matter would behave differently and would not exist (sort of like saying that if a tree falls over in a forest and no-one is there to hear it, it makes no noise, but of course a tree falling over is not a "quantum" event and so is not subject to the same laws but the concept is similar). The latest issue of Astronomy magazine has a brief article on some of these thoughts.
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