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Cleveland, cities, United States

(Encyclopedia)Cleveland. 1 City (2020 pop. 372,674), seat of Cuyahoga co., NE Ohio, on Lake Erie at the mouth of the Cuyahoga River; laid out (1796) by Moses ...

non-Euclidean geometry

(Encyclopedia)non-Euclidean geometry, branch of geometry in which the fifth postulate of Euclidean geometry, which allows one and only one line parallel to a given line through a given external point, is replaced b...

progressive education

(Encyclopedia)progressive education, movement in American education. Confined to a period between the late 19th and mid-20th cent., the term “progressive education” is generally used to refer only to those educ...

reflection

(Encyclopedia)CE5 Image formation by curved mirrors and lenses reflection, return of a wave from a surface that it strikes into the medium through which it has traveled. The general principles governing the ref...

typewriter

(Encyclopedia)typewriter, instrument for producing by manual operation characters similar to those of printing. Corresponding to each key on the instrument's keyboard is a steel type. Activated through a series of ...

Whitehead, Alfred North

(Encyclopedia)Whitehead, Alfred North, 1861–1947, English mathematician and philosopher, grad. Trinity College, Cambridge, 1884. There he was a lecturer in mathematics until 1911. At the Univ. of London he was a ...

Vonnegut, Kurt, Jr.

(Encyclopedia)Vonnegut, Kurt, Jr. vŏnˈəgət [key] 1922–2007, American novelist, b. Indianapolis. After serving in World War II, he worked as a police reporter and wrote short stories for mainstream and science...

Bowie, David

(Encyclopedia)Bowie, David, 1947–2016, British rock-and-roll singer and songwriter who successfully, merged rock, art, and fashion, b. London as David Robert Jones. After singing with five different bands in the ...

Vargas Llosa, Mario

(Encyclopedia)Vargas Llosa, Mario märˈyō värˈgäs yōˈsä [key], 1936–, Peruvian novelist and politician, b. Arequipa. Although his works contain much external realism, emphasizing the ugly and grotesque, h...

3D printer

(Encyclopedia)3D printer, computerized device that produces a three-dimensional object by creating it as a series of thin layers. The object is created from a model stored in computer-aided design file; the model i...