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Holy Roman Empire

(Encyclopedia)CE5 Holy Roman Empire (c.1100) CE5 Holy Roman Empire, designation for the political entity that originated at the coronation as emperor (962) of the German king Otto I and endured until the renu...

secret police

(Encyclopedia)secret police, policing organization operating in secrecy for the political purposes of its government, often with terroristic procedures. Many states, including Chile, Iran, Iraq, Israel, Romania,...

physics

(Encyclopedia)physics, branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this na...

psychology

(Encyclopedia)psychology, science or study of the thought processes and behavior of humans and other animals in their interaction with the environment. Psychologists study processes of sense perception, thinking, l...

Protestantism

(Encyclopedia)Protestantism, form of Christian faith and practice that originated with the principles of the Reformation. The term is derived from the Protestatio delivered by a minority of delegates against the (1...

internal-combustion engine

(Encyclopedia)CE5 Internal-combustion engines: In the four-stroke reciprocating engine (above), a mixture of fuel and air is taken into the chamber on the down-stroke of the piston, is compressed on the up-strok...

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...

newspaper

(Encyclopedia)newspaper, publication issued periodically, usually daily or weekly, to convey information and opinion about current events. In England large newspaper-publishing empires were built up by Lords...

Prussia

(Encyclopedia)Prussia prŭshˈə [key], Ger. Preussen, former state, the largest and most important of the German states. Berlin was the capital. The chief member of the German Empire (1871–1918) and a state of t...

Hungary

(Encyclopedia)CE5 Hungary, Hung. Magyarország, republic (2015 est. pop. 9,784,000), 35,919 sq mi (93,030 sq km), central Europe. Hungary borders on Slovakia in the north, on Ukraine in the northeast, on Romania...