| A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion. Both reactions release vast quantities of energy from relatively small amounts of matter; a modern thermonuclear weapon weighing little more than a thousand kilograms can produce an explosion comparable to the detonation of more than a billion kilograms of conventional high explosive. Even small nuclear devices can devastate a city. Nuclear weapons are considered weapons of mass destruction, and their use and control has been a major aspect of international policy since their debut.
| The First Atomic Bomb Blast, 1945The events that took place in a remote area of New Mexico during the predawn hours of July 16, 1945 forever changed the world.Even before the bomb was tested, a second bomb was secretly dispatched to the Pacific for an attack on the Japanese city of Hiroshima.
| Total number of nuclear missiles built, 1951-present: 67,500Total number of nuclear bombers built, 1945-present: 4,680Total number and types of nuclear warheads and bombs built, 1945-1990: more than 70,000/65 typesNumber of secret Presidential Emergency Facilities built for use during and after a nuclear war: more than 75
| The medical effects of a nuclear blast upon humans can be put into four categories: the initial stage, the first 1-2 weeks, the greatest amount of deaths are in this period with 90% due to thermal injury and or blast effects and 10% due to supralethal radiation exposure, the intermediate stage from 3-8 weeks the deaths in this period are from ionization radiation in the median lethal range, and the late period lasting from 8-20 weeks, this period has some improvement in...
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