afraid you with nuclear?

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weapons that get energy from nuclear reactions and has a tremendous destructive power - a nuclear bomb could destroy a city. Nuclear weapons have been used only twice in combat - during World War II by the United States against Japanese cities, Hiroshima and Nagasaki. that time the yield nuclear bomb which was dropped on Hiroshima and Nagasaki at 20 kilo (thousand) tons of tnt.While the nuclear bomb is now more than 70 explosive mega (million) tons of TNT.Countries with nuclear arms that confirmed the United States, Russia, United Kingdom (UK), France, People's Republic of China, India and Pakistan. In addition the state of Israel is believed to have nuclear weapons, although not tested and are reluctant to confirm whether Israel has nuclear weapons or not. See list of countries with nuclear weapons further.Form of nuclear bombs dropped on Hiroshima and Nagasaki.Nuclear weapons can now be carried out through various means, such as through the bombers, guided missiles, ballistic missiles, and ballistic missile,Afraid if all countries have nuclear weapons?