It's a nightmare we've been living with all our lives. "I grew up in an era when we had to hide under our desks in the case of an atomic bomb," said director Kathryn Bigelow, "so I suppose I was sort of imprinted early on with the prospect of nuclear war." In Bigelow's new film, "A House of Dynamite," the prospect of nuclear war suddenly becomes an insane reality. It tells of a single missile launched from an unknown location in the Pacific. At first it looks like a test, but it keeps on coming