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Earth Day

(Encyclopedia)Earth Day, Apr. 22, a day to celebrate the environment. The first Earth Day was organized in 1970 to promote the ideas of ecology, encourage respect for life on earth, and highlight growing concern ov...

Black, Joseph

(Encyclopedia)Black, Joseph, 1728–99, Scottish chemist and physician, b. France. He was professor of chemistry at Glasgow (1756–66) and from 1766 at Edinburgh. He is best known for his theories of latent heat a...

Riverside

(Encyclopedia)Riverside. 1 City (1990 pop. 226,505), seat of Riverside co., S Calif.; inc. 1883. One of the fastest growing U.S. cities in the late 20th cent., it is famous for its orange industry. The navel orange...

damp

(Encyclopedia)damp, in mining, any mixture of gases in an underground mine, especially oxygen-deficient or noxious gases. The term damp probably is derived from the German dampf, meaning fog or vapor. Several disti...

submarine

(Encyclopedia)submarine, naval craft capable of operating for an extended period of time underwater. Submarines are almost always warships, although a few are used for scientific, business, or other purposes (see a...

helium

(Encyclopedia)helium hēˈlēəm [key], gaseous chemical element; symbol He; at. no. 2; at. wt. 4.0026; m.p. below −272℃ at 26 atmospheres pressure; b.p. −268.934℃ at 1 atmosphere pressure; density 0.1785 g...

Needham

(Encyclopedia)Needham nēdˈəm [key], town (1990 pop. 27,557), Norfolk co., E Mass., a suburb of Boston; founded 1680, set off from Dedham and inc. 1711. Although largely residential, paper products, electronic eq...

Northeastern University

(Encyclopedia)Northeastern University, at Boston, Mass.; coeducational; founded 1898 as a program within the Boston YMCA, inc. 1916, university status 1922, fully independent of the YMCA 1948. It is noted for its c...

Attleboro

(Encyclopedia)Attleboro ătˈəlbərə [key], industrial city (2020 pop. 46,461), Bristol co., SE Mass., near the R.I. line; settled 1634, inc. as a city 1914. Its jewelry industry bega...

Tewksbury

(Encyclopedia)Tewksbury, town (1990 pop. 27,266), Middlesex co., NE Mass.; settled 1637, set off from Billerica and inc. 1734. It was once the site of a Native American settlement. Primarily residential, the town h...