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seaborgium
(Encyclopedia)seaborgium sēbôrˈgēəm [key], artificially produced radioactive chemical element; symbol Sg; at. no. 106; mass number of most stable isotope 271; m.p., b.p., sp. gr., and valence unknown. Situated...curium
(Encyclopedia)curium kyo͝orˈēəm [key], artificially produced radioactive chemical element; symbol Cm; at. no. 96; mass no. of most stable isotope 247; m.p. about 1,340℃; b.p. 3,110℃; sp. gr. 13.5 (calculate...flycatcher
(Encyclopedia)flycatcher, common name for various members of the Old World family Muscicapidae, insectivorous songbirds including the kingbirds, phoebes, and pewees. Flycatchers vary in color from drab to brilliant...Loyalists
(Encyclopedia)Loyalists, in the American Revolution, colonials who adhered to the British cause. The patriots referred to them as Tories. Although Loyalists were found in all social classes and occupations, a dispr...National Aeronautics and Space Administration
(Encyclopedia)National Aeronautics and Space Administration (NASA), civilian agency of the U.S. federal government with the mission of conducting research and developing operational programs in the areas of space e...plutonium
(Encyclopedia)plutonium plo͞otōˈnēəm [key], radioactive chemical element; symbol Pu; at. no. 94; mass no. of most stable isotope 244; m.p. 641℃; b.p. 3,232℃; sp. gr. 19.84 at 20℃; valence +3, +4, +5, or ...Macedon
(Encyclopedia)Macedon măsˈədŏn [key], ancient country, roughly equivalent to the modern region of Macedonia. In the history of Greek culture Macedon had its single significance in producing the conquerors and a...Greenland
(Encyclopedia)Greenland, Green. Kalaallit Nunaat, Dan. Grønland, the largest island in the world (2015 est. pop. 56,000), 836,109 sq mi (2,166,086 sq km), self-governing overseas administrative division of Denmark...smoking
(Encyclopedia)smoking, inhalation and exhalation of the fumes of burning tobacco in cigars and cigarettes and pipes; in the 21st cent., vaping, the similar use of e-cigarettes, also has become common. Some persons ...Alexander the Great
(Encyclopedia)CE5 Empire of Alexander the Great (including dependencies) Alexander the Great or Alexander III, 356–323 b.c., king of Macedon, conqueror of much of Asia. Whether or not Alexander had plans fo...Browse by Subject
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