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tragedy

(Encyclopedia)tragedy, form of drama that depicts the suffering of a heroic individual who is often overcome by the very obstacles he is struggling to remove. The protagonist may be brought low by a character flaw ...

Persian art and architecture

(Encyclopedia)Persian art and architecture, works of art and structures produced in the region of Asia traditionally known as Persia and now called Iran. Bounded by fierce mountains and deserts, the high plateau of...

cosmology

(Encyclopedia)cosmology, area of science that aims at a comprehensive theory of the structure and evolution of the entire physical universe. The earliest pre-Ptolemaic theories assumed that the earth was the cent...

Europe

(Encyclopedia)CE5 Europe yo͝orˈəp [key], 6th largest continent, c.4,000,000 sq mi (10,360,000 sq km) including adjacent islands (2015 est. pop. 740,814,000). It is actually a vast peninsula of the great Euras...

Ontario, province, Canada

(Encyclopedia)CE5 Ontario ŏntârˈēō [key], province (2001 pop. 11,410,046), 412,582 sq mi (1,068,587 sq km), E central Canada. Before the arrival of Europeans the Ontario region was inhabited by several Al...

magnetism

(Encyclopedia)CE5 Lines of induction around a single bar magnet and between opposite poles of different magnets magnetism, force of attraction or repulsion between various substances, especially those made of i...

cat

(Encyclopedia)cat, name applied broadly to the carnivorous mammals constituting the family Felidae, and specifically to the domestic cat, Felis catus. The great roaring cats, the lion, tiger, and leopard are anatom...

comet

(Encyclopedia)CE5 Comet: Whatever the direction of a comet's flight, its “tail” always points away from the sun. The tail disappears when the comet is far from the sun. comet [Gr.,=longhaired], a small cele...

Arabia

(Encyclopedia)Arabia ərāˈbēə [key], peninsula (1991 est. pop. 35,000,000), c.1,000,000 sq mi (2,590,000 sq km), SW Asia. It is bordered on the W by the Gulf of Aqaba and the Red Sea, on the S by the Gulf of Ad...

nervous system

(Encyclopedia)CE5 Nerve cell CE5 Nervous system nervous system, network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually all members of ...