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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...

rubber

(Encyclopedia)CE5 Basic molecules in rubber rubber, any solid substance that upon vulcanization becomes elastic; the term includes natural rubber (caoutchouc) and synthetic rubber. The term elastomer is sometim...

Bohemia

(Encyclopedia)Bohemia, Czech Čechy, historic region (20,368 sq mi/52,753 sq km) and former kingdom, in W and central Czech Republic. Bohemia is bounded by Austria in the southeast, by Germany in the west and north...

radio

(Encyclopedia)CE5 A. AM transmitter B. AM receiver radio, transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially...

American art

(Encyclopedia)American art, the art of the North American colonies and of the United States. There are separate articles on American architecture, North American Native art, pre-Columbian art and architecture, Mexi...

Slovakia

(Encyclopedia)CE5 Slovakia slôˈvĕnskô [key], republic (2015 est. pop. 5,439,000), 18,917 sq mi (48,995 sq km), central Europe. It is bordered by the Czech Republic in the west, by Austria in the southwest, b...

Reconstruction

(Encyclopedia)Reconstruction, 1865–77, in U.S. history, the period of readjustment following the Civil War. At the end of the Civil War, the defeated South was a ruined land. The physical destruction wrought by t...

ballet

(Encyclopedia)CE5 The five classical positions in ballet ballet bălˈā, bălāˈ [key] [Ital. ballare=to dance], classic, formalized solo or ensemble dancing of a highly controlled, dramatic nature performed ...

Orthodox Eastern Church

(Encyclopedia)Orthodox Eastern Church, community of Christian churches whose chief strength is in the Middle East and E Europe. Their members number some 300 million worldwide. The Orthodox agree doctrinally in acc...

Egypt

(Encyclopedia)CE5 CE5 Egypt ēˈjĭpt [key], Arab. Misr, biblical Mizraim, officially Arab Republic o...