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World Heritage Site
(Encyclopedia)World Heritage Site, a place of cultural or natural importance listed on the United Nations Educational, Scientific, and Cultural Organization (UNESCO) World Heritage List. The sites, some natural, so...Manhattan Project
(Encyclopedia)Manhattan Project, the wartime effort to design and build the first nuclear weapons (atomic bombs). With the discovery of fission in 1939, it became clear to scientists that certain radioactive materi...radiation sickness
(Encyclopedia)radiation sickness, harmful effect produced on body tissues by exposure to radioactive substances. The biological action of radiation is not fully understood, but it is believed that a disturbance in ...atomic bomb
(Encyclopedia)atomic bomb or A-bomb, weapon deriving its explosive force from the release of nuclear energy through the fission (splitting) of heavy atomic nuclei. The first atomic bomb was produced at the Los Alam...Truman, Harry S.
(Encyclopedia)Truman, Harry S., 1884–1972, 33d President of the United States, b. Lamar, Mo. Truman remained active in politics for many years after his retirement, campaigning around the country for Democrat...air forces
(Encyclopedia)air forces, those portions of a nation's military organization employing heavier-than-air aircraft for reconnaissance, support of ground troops, aerial combat, and bombing of enemy lines of communicat...cold war
(Encyclopedia)cold war, term used to describe the shifting struggle for power and prestige between the Western powers and the Communist bloc from the end of World War II until 1989. Of worldwide proportions, the co...cancer, in medicine
(Encyclopedia)cancer, in medicine, common term for neoplasms, or tumors, that are malignant. Like benign tumors, malignant tumors do not respond to body mechanisms that limit cell growth. Unlike benign tumors, mali...World War II
(Encyclopedia)World War II, 1939–45, worldwide conflict involving every major power in the world. The two sides were generally known as the Allies and the Axis. Although hostilities came to an end in Sept...Japan
(Encyclopedia)CE5 Japan jəpănˈ [key], Jap. Nihon or Nippon, country (2015 est. pop. 127,975,000), 145,833 sq mi (377,835 sq km), occupying an archipelago off the coast of E Asia. The capital is Tokyo, which, ...Browse by Subject
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