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Summers, Lawrence Henry
(Encyclopedia) Summers, Lawrence Henry, 1954–, U.S. economist, government official, and educator, b. New Haven, Conn. Educated at the Massachusetts Institute of Technology (MIT) and Harvard, he…treehopper
(Encyclopedia) treehopper, any member of three families of winged insects, remarkable for the curious shapes of most species. The shapes are due to the enlargement of the dorsal (upper) covering of…Tagus
(Encyclopedia) TagusTagustāˈgəs [key], Span. Tajo, Port. Tejo, river, c.585 mi (940 km) long, rising in the mountains E of Madrid, E Spain, and draining the central part of the Iberian Peninsula. The…box turtle
(Encyclopedia) box turtle, hard-shelled land turtle of the genus Terrapene, native to North America. Its lower shell, or plastron, has a hinge dividing it into front and rear sections; the animal can…Cretaceous period
(Encyclopedia) Cretaceous periodCretaceous periodkrĭtāˈshəs [key], third and last period of the Mesozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), lasting from…The Journals of Lewis & Clark: Lewis, December 19, 1805
Day 1080 Day 1082 Lewis, December 19, 1805 Discription of the blue Crested corvus bird common to the woody and western side of the Rockey mountains, and all the woody country from thence to…The Journals of Lewis & Clark: December 19, 1805
by Meriwether Lewis and William Clark December 18, 1805December 20, 1805December 19, 1805 Discription of the blue Crested corvus bird common to the woody and western side of the…Niger, river, Africa
(Encyclopedia) NigerNigernīˈjər [key], great river of W Africa, c.2,600 mi (4,180 km) long, rising on the Fouta Djallon plateau, SW Guinea, and flowing NE through Guinea and into Mali. In central…leaf
(Encyclopedia) CE5 Microscopic cross section of the leaf blade CE5 Types of leaves leaf, chief food-manufacturing organ of a plant, a lateral outgrowth of the growing point of stem. The…Louis IV, Holy Roman emperor
(Encyclopedia) Louis IV or Louis the Bavarian, 1287?–1347, Holy Roman emperor (1328–47) and German king (1314–47), duke of Upper Bavaria. After the death of Holy Roman Emperor Henry VII the Luxemburg…