The closer you are to nuclear weapons, the more you are aware of their dangers. People today seem to have forgotten-if they ever knew-what a single nuclear weapon can do. Which, if nothing else, is something that atmospheric testing can accomplish: Remind everyone of what's at stake. The inhabitants of the Marshall Islands, whose home was turned into a nuclear proving ground, have certainly never forgotten. Nor has the crew of a Japanese fishing vessel that strayed too close to the nuclear weapon test known as Bravo.