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projective geometry

(Encyclopedia)projective geometry, branch of geometry concerned with those properties of geometric figures that remain invariant under projection. The basic elements are points, lines, and planes, and the following...

Qur'an

(Encyclopedia)Qur'an or Koran kōrănˈ, –ränˈ [key] [Arab.,=reading, recitation], the sacred book of Islam. Revealed by God to the Prophet Muhammad in separate revelations over the major portion of the Prophet...

Jefferson, Thomas

(Encyclopedia)Jefferson, Thomas, 1743–1826, 3d President of the United States (1801–9), author of the Declaration of Independence, and apostle of agrarian democracy. After 1809, Jefferson lived in retirem...

Thunberg, Greta

(Encyclopedia)Thunberg, Greta, 2003–, Swedish climate activist. She came to public notice in 2018 when she encouraged students to skip school on Fridays to protest societal inaction on climate change. Through soc...

Sumner, William Graham

(Encyclopedia)Sumner, William Graham, 1840–1910, American sociologist and political economist, b. Paterson, N.J., grad. Yale, 1863, and studied in Germany, in Switzerland, and at Oxford. He was ordained an Episco...

Anglo-Saxon literature

(Encyclopedia)Anglo-Saxon literature, the literary writings in Old English (see English language), composed between c.650 and c.1100. See also English literature. Old English literary prose dates from the latter ...

Dam, Henrik

(Encyclopedia)Dam, Henrik hănˈrēk däm [key], 1895–1976, Danish biochemist. He identified vitamin K in 1934 and later investigated the role of vitamin E in nutrition. The 1943 Nobel Prize in Physiology or Medi...

dark horse

(Encyclopedia)dark horse, in U.S. politics, a person unexpectedly chosen by a major party as a candidate for public office, especially for the presidency. A presidential dark horse is usually chosen at a party nati...

Fallows, Samuel

(Encyclopedia)Fallows, Samuel, 1835–1922, American clergyman, bishop of the Reformed Episcopal Church, b. England, grad. Univ. of Wisconsin, 1859. He served with the Union army in the Civil War and afterward held...

Murray, Sir James Augustus Henry

(Encyclopedia)Murray, Sir James Augustus Henry, 1837–1915, English lexicographer. In 1879 he assumed the editorship of the New English Dictionary (the Oxford English Dictionary), which was his life's work (see di...