Instead, quantum mechanics says the particle is hovering in a fuzzy mixture of being both here and there. And if the probabilities give the electron a nonzero chance to be at a variety of different locations, then according to quantum mechanics it would be hovering in a fuzzy mixture of being simultaneously situated at all of them. This is so fantastically strange, and so counter to experience, that you might be tempted to dismiss the theory out of hand. And if it weren’t for quantum mechanics’ unmatched capacity to explain experimental data, that reaction would be both widespread and
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