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In its attempts to harness the power of the atom, mankind has itself in the possession of weapons with unbelievable, destructive power. Nations now have the ability to destroy entire cities from hundreds of miles away, in only minutes. These weapons are . cost ....

Middle of Essay
.... nuclear weapons possible. In a fusion nuclear device such as a hydrogen bomb, lightweight nuclei are forced to fuse at very high temperatures into heavier nuclei, releasing energy and a neutron. In order to squeeze the two nuclei together, an atomic fission bomb is usually used. A fusion reaction releases about four times more energy per unit mass than a fission reaction. The United States supervised the development of the atomic bomb under the code name Manhattan Project, during World War II. The first nuclear chain reaction occurred in December 1942, at the University of Chicago. Soon after the first bomb test, atomic bombs were dropped ....