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student movements

(Encyclopedia)student movements, designation given to the ideas and activities of student groups involved in social protest. Historically, student movements have been in existence almost as long as universities the...

Ur

(Encyclopedia)Ur ûr [key], ancient city of Sumer, S Mesopotamia. The city is also known as Ur of the Chaldees. It was an important center of Sumerian culture (see Sumer) and is identified in the Bible as the home ...

Ordovician period

(Encyclopedia)Ordovician period ôrdəvĭshˈən [key] [from the Ordovices, ancient tribe of N Wales], second period of the Paleozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table) fr...

Polish literature

(Encyclopedia)Polish literature, the literary works of Poland. The regaining of Polish independence in 1919 after generations of partition inspired new literary activity. The Skamander group of urban poets, inclu...

organized crime

(Encyclopedia)organized crime, criminal activities organized and coordinated on a national scale, often with international connections. The American tradition of daring desperadoes like Jesse James and John Dilling...

baseball

(Encyclopedia)CE5 A regulation baseball field. Minimum distance to the outfield fence is 250 ft; professional baseball fields constructed since 1958 have been at least 325 ft deep along the foul lines and 400 ft...

drug resistance

(Encyclopedia)drug resistance, condition in which infecting bacteria can resist the destructive effects of drugs such as antibiotics and sulfa drugs. Drug resistance has become a serious public health problem, sinc...

continental drift

(Encyclopedia)CE5 Continental drift (arrows indicate the directions of motion of the landmasses) A. Proposed reconstruction of the supercontinent Pangaea indicating the major present landmasses B. Proposed recon...

Federal Bureau of Investigation

(Encyclopedia)Federal Bureau of Investigation (FBI), division of the U.S. Dept. of Justice charged with investigating all violations of federal laws except those assigned to some other federal agency. The FBI has j...

Humboldt, Alexander, Freiherr von

(Encyclopedia)Humboldt, Alexander, Freiherr von hŭmˈbōlt, Ger. älĕksänˈdər frīˈhĕr fən ho͝omˈbôlt [key], 1769–1859, German naturalist, inventor, explorer, and author, the most eminent scientist of ...