ROBERT OPPENHEIMER’S life—his career, his reputation, even his sense of self-worth—suddenly spun out of control four days before Christmas in 1953. “I can’t believe what is happening to me,” he exclaimed, staring through the window of the car speeding him to his lawyer’s Georgetown home in Washington, D.C. There, within a few hours, he had to confront a fateful decision. Should he resign from his government advisory positions? Or should he fight the charges contained in the letter that Lewis Strauss, chairman of the Atomic Energy Commission (AEC), had handed to him out of the blue earlier that afternoon?