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Duruy, Victor

(Encyclopedia)Duruy, Victor vēktôrˈ dürüēˈ [key], 1811–94, French historian. He was a professor at Reims and Paris, and as minister of public instruction (1863–69) under Napoleon III he encouraged the ad...

Head Start

(Encyclopedia)Head Start, U.S. educational program for disadvantaged preschool children, established under the Economic Opportunity Act of 1964. Aimed initially only at poor children, its purpose was to organize pr...

Forster, William Edward

(Encyclopedia)Forster, William Edward, 1818–86, British statesman. He entered Parliament as a Liberal in 1861. As vice president of the council in William Gladstone's first ministry (1868–74), he introduced the...

Titchener, Edward Bradford

(Encyclopedia)Titchener, Edward Bradford tĭchˈənər [key], 1867–1927, American psychologist, b. Chichester, England, grad. Oxford, 1890. He studied in Leipzig (Ph.D. 1892) under Wundt (whose Principles of Phys...

Roscoe, Sir Henry Enfield

(Encyclopedia)Roscoe, Sir Henry Enfield rŏsˈkō [key], 1833–1915, English chemist. He was professor (1857–87) at Owens College, Manchester. He is known for his work, with R. W. Bunsen, in photochemistry and f...

public school

(Encyclopedia)public school, in the United States, a tax-supported elementary or high school open to anyone. In England the term was originally applied to grammar schools endowed for the use of the lay public; howe...

matter

(Encyclopedia)matter, anything that has mass and occupies space. Matter is sometimes called koinomatter (Gr. koinos=common) to distinguish it from antimatter, or matter composed of antiparticles. The atomic th...

lightning

(Encyclopedia)lightning, electrical discharge accompanied by thunder, commonly occurring during a thunderstorm. The discharge may take place between one part of a cloud and another part (intracloud), between one cl...

atom

(Encyclopedia)CE5 Bohr-Rutherford atom CE5 Probability distribution of the electron in the hydrogen atom: A. Ground state B. Highly excited state atom [Gr.,=uncuttable (indivisible)], basic unit of matte...

light

(Encyclopedia)light, visible electromagnetic radiation. Of the entire electromagnetic spectrum, the human eye is sensitive to only a tiny part, the part that is called light. The wavelengths of visible light range ...