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The Mongol Empire
Genghis Khan, founder of history's largest empire The Mongol Empire was one of the most powerful, and misunderstood, empires in history. While many people view them as barbarians that roamed the…Order of Operations
When you have a math problem that involves more than one operation—for example, addition and subtraction, or subtraction and multiplication—which do you do first? Example #1: 6 – 3 x 2 = ? Do you…Collier, John
(Encyclopedia) Collier, John, 1884–1968, American social worker, anthropologist, and author, educated at Columbia and the Collège de France. After holding several positions in community organization…Hilbert, David
(Encyclopedia) Hilbert, David, 1862–1943, German mathematician, professor at Königsberg (1886–95) and Göttingen (1895–1930), b. Königsberg, Germany. His proof of the theorum of invariants (1890)…Dawes, William
(Encyclopedia) Dawes, William, 1745–99, figure in the American Revolution, b. Boston, Mass. On the night of Apr. 18, 1775, Dawes rode from Boston, via Brighton Bridge, to Lexington, warning the…Brosse, Salomon de
(Encyclopedia) Brosse, Salomon deBrosse, Salomon desälōmôNˈ də brôs [key], 1571–1626, French architect, trained by his grandfather, Jacques du Cerceau, the elder. He paved the way for the next…Wisconsin v. Yoder
(Encyclopedia) Wisconsin v. Yoder, case decided in 1972 by the U.S. Supreme Court, which held that Amish children could be exempted from compulsory school-attendance beyond the 8th grade; the Amish (…Queen Elizabeth Islands
(Encyclopedia) Queen Elizabeth Islands, northern part of the Arctic Archipelago, Northwest Territories and Nunavut, N Canada. Ellesmere Island (the largest), the Parry group (Melville, Bathurst,…Cotton, John
(Encyclopedia) Cotton, John, 1584–1652, Puritan clergyman in England and Massachusetts, b. Derbyshire, educated at Cambridge. Imbued with Puritan doctrines, he won many followers during his 20 years…Lyell, Sir Charles
(Encyclopedia) Lyell, Sir CharlesLyell, Sir Charleslīˈəl [key], 1797–1875, British geologist. After studying and briefly practicing law, he spent most of his life in travel and in popularizing…Trending
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