At the dawn of the atomic age, scientists began work on what might have been the nastiest weapon ever conceived.Those who came of age during the era of Three Mile Island and Chernobyl are probably too young to remember the happy days when "our friend the atom" promised electricity too cheap to meter and cars that would run forever without a fill-up. With atom-powered subs like the Nautilus cruising under the polar icecap in the mid-1950s, could anyone doubt that atom-powered rocketships, airplanes, and even automobiles would be far behind? A funny thing happened to that dream on its way...