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No one intuitively understands quantum mechanics because all of our experience involves a world of classical phenomena where, for example, a baseball thrown from pitcher to catcher seems to take just one path, the one described by Newton's laws of motion. Yet at a microscopic level, the universe behaves quite differently.
When you do calculations using quantum mechanics, even when you are calculating something perfectly sensible like the energy of an atomic state, you get an answer that is infinite. This means you are wrong - but how do you deal with that? Is there something wrong with the theory, or something wrong with the way you are doing the calculation?