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Columbia, U.S. space shuttle
(Encyclopedia) Columbia, U.S. space shuttle. On its 28th flight, on Feb. 1, 2003, after completing a 16-day scientific mission, the spacecraft disintegrated during reentry, killing its seven-person…data communications
(Encyclopedia) data communications, application of telecommunications technology to the problem of transmitting data, especially to, from, or between computers. In popular usage, it is said that data…analog-to-digital conversion
(Encyclopedia) analog-to-digital or A/D conversion, the process of changing continuously varying data, such as voltage, current, or shaft rotation, into discrete digital quantities that represent the…norepinephrine
(Encyclopedia) norepinephrinenorepinephrinenôrˌĕpīnĕfˈrən [key], a neurotransmitter in the catecholamine family that mediates chemical communication in the sympathetic nervous system, a branch of the…ionosphere
(Encyclopedia) ionosphereionosphereīŏnˈəsfēr [key], series of concentric ionized layers forming part of the upper atmosphere of the earth from around 30 to 50 mi (50 to 80 km) to 250 to 370 mi (400…Hull, city, England
(Encyclopedia) Hull, officially Kingston upon Hull, city and unitary authority, NE England, on the north shore of the Humber estuary at the influx…Johor
(Encyclopedia) Johor or JohoreJohorejōhôrˈ, jə– [key], state (1991 pop. 2,074,297), 7,360 sq mi (19,062 sq km), at the southern extremity of the Malay Peninsula, Malaysia, opposite Singapore. It is…Frederick William, elector of Brandenburg
(Encyclopedia) Frederick William, known as the Great Elector, 1620–88, elector of Brandenburg (1640–88), son and successor of George William. At his accession the scattered lands of the Hohenzollern…warfare
(Encyclopedia) warfare, violent conflict between armed enemies. In modern times warfare has usually been conducted by the armed forces (e.g., army, navy, and air force) of a nation or other…electric fish
(Encyclopedia) electric fish, name for various fish that produce electricity by means of organs usually developed from modified muscle tissue. The electric eels of South America are freshwater…Trending
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