Nuclear Weapon
NUCLEAR WEAPON: A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions , either fission or a combination of fission and fusion reactions .Both bomb types release large quantities of energy from relatively small amounts of matter. Nuclear weapons are the most dangerous weapons on earth. One can destroy a whole city, potentially killing millions, and jeopardizing the natural environment and lives of future generations through its long-term catastrophic effects. The dangers from such weapons arise from their very existence. Although nuclear weapons have only been used twice in warfare—in the bombings of Hiroshima and Nagasaki in 1945—about 13,400 reportedly remain in our world today and there have been over 2,000 nuclear tests conducted to date. Disarmament is the best protection against such dangers, but achieving this goal has been a tremendously difficult challenge. There are two basic types of nuclear weapons: those that d