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21Operation Brevity — Coordinates: 31°34′51″N 25°3′8″E / 31.58083°N 25.05222°E / 31.58083; 25.05222 …
22Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
23reaction mechanism — Introduction in chemical reactions (chemical reaction), the detailed processes by which chemical substances are transformed into other substances. The reactions themselves may involve the interactions of atoms (atom), molecules (molecule),… …
24MOGUL framework — The MOGUL framework is a research framework aiming to provide a theoretical perspective on the nature of language. MOGUL (Modular On line Growth and Use of Language) draws on the common ground underlying various related areas of cognitive science …
25Elburz Mountains — /el boorz / a mountain range in N Iran, along the S coast of the Caspian Sea. Highest peak, Mt. Demavend, 18,606 ft. (5671 m). * * * Mountain range, northern Iran. It is 560 mi (900 km) long and extends along the southern shore of the Caspian Sea …
26Little Saigon — This article deals exclusively with the Vietnamese communities within the United States of America; for other communities outside Vietnam, refer to the Overseas Vietnamese article.Little Saigon is a name given to any of several overseas… …
27combinatorics — /keuhm buy neuh tawr iks, tor , kom beuh /, n. (used with singular v.) See combinatorial analysis. * * * Branch of mathematics concerned with the selection, arrangement, and combination of objects chosen from a finite set. The number of possible… …
28coordination compound — Chem. complex (def. 10). Also called coordination complex. * * * ▪ chemistry Introduction any of a class of substances with chemical structures in which a central metal atom is surrounded by nonmetal atoms or groups of atoms, called ligands… …
29Clandestine cell system — Sleeper cell redirects here. For other uses, see Sleeper cell (disambiguation). Terrorism Definitions · Counter terrorism Internation …
30Fall of Constantinople — This article is about the 1453 siege. For earlier attacks on the city, see List of sieges of Constantinople. Conquest of Constantinople Part of the Byzantine–Ottoman Wars and Ottoman wars in Europe …
