"I once asked Bell whether during the years he was studying the quantum theory it ever occurred to him that the theory might simply be wrong. He thought a moment and answered, “I hesitated to think it might be wrong, but I knew that it was rotten.” Bell pronounced the word “rotten” with a good deal of relish and then added, “That is to say, one has to find some decent way of expressing whatever truth there is in it.” The attitude that even if there is not something actually wrong with the theory, there is something deeply unsettling—“rotten”—about it, was common to most of the creators of the quantum theory. Niels Bohr was reported to have remarked, “Well, I think that if a man says it is completely clear to him these days, then he has not really understood the subject.” He later added, “If you do not getschwindlig [dizzy] sometimes when you think about these things then you have not really understood it.” My teacher Philipp Frank used to tell about the time he visited Einstein in Prague in 1911. Einstein had an office at the university that over looked a park. People were milling around in the park, some engaged in vehement gesture-filled discussions. When Professor Frank asked Einstein what was going on, Einstein replied that it was the grounds of a lunatic asylum, adding, “Those are the madmen who do not occupy themselves with the quantum theory.”"