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pollution

(Encyclopedia)pollution, contamination of the environment as a result of human activities. The term pollution refers primarily to the fouling of air, water, and land by wastes (see air pollution; water pollution; s...

Trenton , cities, United States

(Encyclopedia)Trenton. 1 City (1990 pop. 20,586), Wayne co., SE Mich., on the Detroit River opposite Grosse Ile, in a farm area; settled 1816, inc. as a city 1957. An early river port, it has plants that make metal...

wagon train

(Encyclopedia)wagon train, in U.S. history, a group of covered wagons used to convey people and supplies to the West before the coming of the railroad. The wagon replaced the pack, or horse, train in land commerce ...

Callahan, Harry Morey

(Encyclopedia)Callahan, Harry Morey, 1912–99, American photographer, b. Detroit. Self-taught, he began taking pictures (1938) as a hobby and, inspired by the work of Ansel Adams, began to produce professional-qua...

Brulé, Étienne

(Encyclopedia)Brulé, Étienne ātyĕnˈ brülāˈ [key], c.1592–1632, French explorer in North America. He arrived (1608) in the New World with Samuel de Champlain, who sent him (1610) into the wilderness to lea...

Fletcher, Alice Cunningham

(Encyclopedia)Fletcher, Alice Cunningham, 1838–1923, American anthropologist, b. Havana, Cuba. Originally interested in archaeology, she turned to the study of the Plains tribes. After studying informally with Fr...

Sims, William Sowden

(Encyclopedia)Sims, William Sowden, 1858–1936, American naval officer, b. Port Hope, Upper Canada (now Ontario), of American parents. After serving with the Atlantic and Pacific fleets, he was (1897–1900) naval...

retrovirus

(Encyclopedia)retrovirus, type of RNA virus that, unlike other RNA viruses, reproduces by transcribing itself into DNA. An enzyme called reverse transcriptase allows a retrovirus's RNA to act as the template for th...

injunction

(Encyclopedia)injunction, in law, order of a court directing a party to perform a certain act or to refrain from an act or acts. The injunction, which developed as the main remedy in equity, is used especially wher...

Niagara Falls, city, United States

(Encyclopedia)Niagara Falls, city (1990 pop. 61,840), Niagara co., W N.Y., at the great falls of the Niagara River opposite Niagara Falls, Ont.; inc. 1892. Tourism is one of its oldest industries, and many state pa...