"In the post-9/11 era, it is worth recalling that at the dawn of the nuclear age, the father of the atomic bomb warned us that it was a weapon of indiscriminate terror that instantly had made America more vulnerable to wanton attack. When he was asked in a closed Senate hearing in 1946 'whether three of four men couldn't smuggle units of an [atomic] bomb into New York and blow up the whole city,' he responded pointedly, 'Of course it could be done, and people could destroy New York.' To the follow-up question of a startled senator, 'What instrument would you use to detect an atomic bomb hidden somewhere in a city?' Oppenheimer quipped, 'A screwdriver [to open each and every crate or suitcase].' "