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heart, in anatomy

(Encyclopedia)CE5 Cross section of heart, with arrows indicating direction of blood flow heart, muscular organ that pumps blood to all parts of the body. The rhythmic beating of the heart is a ceaseless activit...

Poe, Edgar Allan

(Encyclopedia)Poe, Edgar Allan, 1809–49, American poet, short-story writer, and critic, b. Boston. He is acknowledged today as one of the most brilliant and original writers in American literature. His skillfully...

airship

(Encyclopedia)airship, an aircraft that consists of a cigar-shaped gas bag, or envelope, filled with a lighter-than-air gas to provide lift, a propulsion system, a steering mechanism, and a gondola accommodating pa...

South African War

(Encyclopedia)South African War or Boer War, 1899–1902, war of the South African Republic (Transvaal) and the Orange Free State against Great Britain. The Boers accepted British sovereignty in exchange for a ...

Russian Far East

(Encyclopedia)Russian Far East, formerly Soviet Far East, federal district (1989 est. pop. 7,941,000), c.2,400,000 sq mi (6,216,000 sq km), encompassing the entire northeast coast of Asia and including the Sakha Re...

exploration

(Encyclopedia)exploration, travel to a part of the earth that is relatively unknown to the traveler's culture, historically often motivated by a desire for colonization, conquest, or trade. See also space explorati...

Plato

(Encyclopedia)Plato plāˈtō [key], 427?–347 b.c., Greek philosopher. Plato's teachings have been among the most influential in the history of Western civilization. Many of the late dialogues are devoted to te...

Reagan, Ronald Wilson

(Encyclopedia)Reagan, Ronald Wilson rāˈgən [key], 1911–2004, 40th president of the United States (1981–89), b. Tampico, Ill. In 1932, after graduation from Eureka College, he became a radio announcer and spo...

navigation

(Encyclopedia)navigation, science and technology of finding the position and directing the course of vessels and aircraft. The next great revolution in navigation occurred in the 20th cent., when radio signals ...

Titian

(Encyclopedia)Titian tĭshˈən [key], c.1490–1576, Venetian painter, whose name was Tiziano Vecellio, b. Pieve di Cadore in the Dolomites. Of the very first rank among the artists of the Renaissance, Titian was ...