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stratigraphy

(Encyclopedia)stratigraphy, branch of geology specifically concerned with the arrangement of layered rocks (see stratification). Stratigraphy is based on the law of superposition, which states that in a normal sequ...

Stanislavsky, Constantin

(Encyclopedia)Stanislavsky, Constantin kənstəntyēnˈ stənyĭsläfˈskē [key], 1863–1938, Russian theatrical director, teacher, and actor, whose original name was Constantin Sergeyevich Alekseyev. He was cofo...

Tombaugh, Clyde William

(Encyclopedia)Tombaugh, Clyde William tŏmˈbô [key], 1906–97, American astronomer, b. Streator, Ill. Although lacking formal training or a college degree, he was hired in 1929 as an assistant by the Lowell Obse...

Sanger, Margaret Higgins

(Encyclopedia)Sanger, Margaret Higgins, 1879–1966, American leader in the birth control movement, b. Corning, N.Y. Personal experience and work as a public-health nurse, much of it on New York City's Lower East S...

Kennedy, Ted

(Encyclopedia)Kennedy, Ted (Edward Moore Kennedy), 1932–2009, U.S. senator from Massachusetts (1962–2009), b. Boston, Mass., youngest son of Joseph P. Kennedy and the last survivor of brothers Joseph P. Kennedy...

Rove, Karl Christian

(Encyclopedia)Rove, Karl Christian, 1950–, U.S. political consultant and government official, b. Denver, Colo. Politically active in high school, he joined College Republicans while at the Univ. of Utah and becam...

le Carré, John

(Encyclopedia)le Carré, John lə kärāˈ [key], pseud. of David John Moore Cornwell, 1931–2020, English novelist. He was a tutor at Eton College (1956–58), and subsequently worked for the British foreign serv...

Black Lives Matter

(Encyclopedia)Black Lives Matter, a global political movement. Founded in 2013 by organizers Alicia Garza, Patrisse Cullors, and Opal Tometi, the #Black Lives Matter ...

Missouri Compromise

(Encyclopedia)Missouri Compromise, 1820–21, measures passed by the U.S. Congress to end the first of a series of crises concerning the extension of slavery. By 1818, Missouri Territory had gained sufficient popul...

Surratt, Mary Eugenia

(Encyclopedia)Surratt, Mary Eugenia sərătˈ [key], 1820–65, alleged conspirator in the assassination of Abraham Lincoln, hanged on July 7, 1865. A widow (her maiden name was Jenkins) who had moved from Surratts...