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dentistry

(Encyclopedia)dentistry, treatment and care of the teeth and associated oral structures. Dentistry is mainly concerned with tooth decay, disease of the supporting structures, such as the gums, and faulty positionin...

dam

(Encyclopedia)dam, barrier, commonly across a watercourse, to hold back water, often forming a reservoir or lake; dams are also sometimes used to control or contain rockslides, mudflows, and the like in regions whe...

Cairo, city, Egypt

(Encyclopedia)Cairo kīˈrō [key], Arab. Al Qahirah, city (2021 est. metro. area pop. 21,323,000), capital...

earthquake

(Encyclopedia)CE5 Worldwide pattern of earthquake activity: The dots indicate the epicenters of all earthquakes recorded during a recent 10-year period. CE5 earthquake, trembling or shaking movement of the ea...

Henry IV, king of England

(Encyclopedia)Henry IV, 1367–1413, king of England (1399–1413), eldest son of John of Gaunt and grandson of Edward III; called Henry of Bolingbroke. He founded the Lancastrian dynasty. The new king was immed...

poll

(Encyclopedia)poll, technique for ascertaining the attitudes or opinions of the total, or some segment of the total, population on given questions, usually on political, economic, and social conditions. Sampling ...

Presidents of the United States (table)

(Encyclopedia)Presidents of the United States

aerodynamics

(Encyclopedia)aerodynamics, study of gases in motion. As the principal application of aerodynamics is the design of aircraft, air is the gas with which the science is most concerned. Although aerodynamics is primar...

Brooklyn

(Encyclopedia)Brooklyn bro͝okˈlĭn [key], borough of New York City (2020 pop. 2,736,074), 71 sq mi (184 sq ...

Gettysburg campaign

(Encyclopedia)Gettysburg campaign, June–July, 1863, series of decisive battles of the U.S. Civil War. The Gettysburg battles included more than 160,000 soldiers and many camp laborers. These included thousands ...