Demonstrators form a human peace sign in New York's Central Park, Sunday, May 1, 2005. Invoking memories of the bombs dropped on Hiroshima and Nagasaki decades ago, anti-nuclear weapon and anti-war activists on Sunday marched past the United Nations, where a conference to reassess the Nuclear Nonproliferation Treaty was scheduled to begin this week through mid town to a rally in Central Park. (AP Photo/Mary Altaffer)