History 393 Atomic bomb 295 World War, 1939-1945 195 Bombing, Aerial 131 Terrorism 115 Bombings 111 Moral and ethical aspects 57 more ... Social aspects 56 Atomic bomb victims 51 Boston Marathon Bombing, Boston, Mass., 2013 51 Suicide bombings 50 Aerial operations, American 45 Nuclear warfare 39 Military policy 35 Physicists 33 Campaigns 32 Foreign relations 30 Aerial operations 29 Psychological aspects 28 Nuclear energy 26 Prevention 25 Oklahoma City Federal Building Bombing, Oklahoma City, Okla., 1995 23 Aerial operations, British 21 Political aspects 21 Air power 20 Government policy 19 History and criticism 19 Nuclear weapons 19 Physiological effect 19 Terrorists 19 less ...