Richard Feynman, an incorrigible practical joker, had his own way of dealing with security regulations. When the censors complained that his wife, Arline, now a patient at a tuberculosis sanatorium in Albuquerque, was sending him letters in code and asked for the code, Feynman explained that he didn’t have the key to it—it was a game he played with his wife to practice his code-breaking. Feynman also drove security personnel to distraction when he went on a nighttime safecracking spree, opening the combination locks for secret file cabinets all over the laboratory. On another occasion, he
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