FILE - This March 30, 1979 file picture shows a cooling tower of the Three Mile Island nuclear power plant behind an abandoned playground in Harrisburg, Pa. Even before the March 11, 2011 earthquake and resulting tsunami that led to the current Japanese nuclear crisis, Americans were bombarded with contradictory images and messages that frighten even when they try to reassure. It started with the awesome and deadly mushroom cloud rising from the atomic bomb, which led to fallout shelters and school duck-and-cover drills. (AP Photo/Barry Thumma, File)