>> schlosser: well... >> stahl: was that made public? there was a real effort throughout the cold war to deny that there was any possibility that a nuclear weapon could detonate by accident. >> stahl: today's minuteman iii missiles use rocket fuel that's more stable and less likely to explode. and they've upgraded some key components, too, like the guidance systems that direct the missiles toward their target. >> schlosser: the nuclear weapons themselves, the warhead, the bombs, are much safer than they were 30 years ago. there's no question about that. but the infrastructure, the equipment, what carries those weapons... >> stahl: the minuteman itself goes back... >> schlosser: ...to the nixon administration. >> stahl: the nixon administration? >> schlosser: look at it this way-- if you got a beautiful sports car from the 1960s, it would drive really fast and it would be fun to drive. but a modern car is going to have so many more safety mechanisms that are so much more sophisticated. and the architecture, the command and control archite