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oxygen

(Encyclopedia)oxygen, gaseous chemical element; symbol O; at. no. 8; interval in which at. wt. ranges 15.99903–15.99977; m.p. −218.4℃; b.p. −182.962℃; density 1.429 grams per liter at STP; valence −2. T...

World Trade Center

(Encyclopedia)World Trade Center, former building complex in lower Manhattan, New York City, consisting of seven buildings and a shopping concourse on a 16-acre (6.5-hectare) site; it was destroyed by a terrorist a...

Periodic Table of the Elements (table)

(Encyclopedia)Periodic Table of the Elements (showing atomic number and atomic symbol; click on atomic symbol for more detailed information) Lanthanide Series(Rare Earth Elements) Actinide Series(Radioactive Rar...

Einstein, Albert

(Encyclopedia)Einstein, Albert īnˈstīn [key], 1879–1955, American theoretical physicist, known for the formulation of the relativity theory, b. Ulm, Germany. He is recognized as one of the greatest physicists ...

strategy and tactics

(Encyclopedia)strategy and tactics, in warfare, related terms referring, respectively, to large-scale and small-scale planning to achieve military success. Strategy may be defined as the general scheme of the condu...

war, laws of

(Encyclopedia)war, laws of, in international law, rules and principles regulating an armed conflict between nations. These laws are designed to minimize the destruction of life and property, to proscribe cruel trea...

Churchill, Sir Winston Leonard Spencer, British statesman, soldier, and author

(Encyclopedia)Churchill, Sir Winston Leonard Spencer, 1874–1965, British statesman, soldier, and author; son of Lord Randolph Churchill. Churchill was undoubtedly one of the greatest public figures of the 20t...

star

(Encyclopedia)star, hot incandescent sphere of gas, held together by its own gravitation, and emitting light and other forms of electromagnetic radiation whose ultimate source is nuclear energy. The universe co...

museums of science

(Encyclopedia)museums of science, institutions or buildings where collections relevant to science and technology are preserved and displayed to promote education and research. While the preponderance of these museu...

Lebanon, country, Asia

(Encyclopedia)CE5 Lebanon lĕbˈənən, –nŏnˌ [key], officially Lebanese Republic, republic (2015 est. pop. 5,851,000), 4,015 sq mi (10,400 sq km), SW Asia. The country is bordered on the west by the Mediter...