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diving, deep-sea

(Encyclopedia)diving, deep-sea, act of descending into deep water, generally with some form of breathing apparatus, and remaining there for an extended period. It is used in fishing for sponges, coral, and pearls; ...

logic

(Encyclopedia)logic, the systematic study of valid inference. A distinction is drawn between logical validity and truth. Validity merely refers to formal properties of the process of inference. Thus, a conclusion w...

Catherine II

(Encyclopedia)Catherine II or Catherine the Great, 1729–96, czarina of Russia (1762–96). Catherine increased the power and prestige of Russia by skillful diplomacy and by extending Russia's western boundary i...

Carthage, ancient city, N Africa

(Encyclopedia)Carthage kärˈthĭj [key], ancient city, on the northern shore of Africa, on a peninsula in the Bay of Tunis and near modern Tunis. The Latin name, Carthago or Cartago, was derived from the Phoenicia...

Rulers of France since 987 (table)

(Encyclopedia)Rulers of France since 987(including dates of reign) The Capetians House of Valois House of Bourbon The First Republic The First Empire Bourbon Restoration House of Bourbon-Orléans T...

Schleswig-Holstein

(Encyclopedia)Schleswig-Holstein shlĕsˈvĭkh-hôlˈshtīn [key], state (1994 pop. 2,595,000), c.6,050 sq mi (15,670 sq km), NW Germany. Kiel (the capital and chief port), Lübeck, Flensburg, and Neumünster are t...

Roman architecture

(Encyclopedia)Roman architecture, structures produced by the ancient Romans. Most important among the structures developed by the Romans themselves were basilicas, baths, amphitheaters, and triumphal arches. U...

calendar

(Encyclopedia)calendar [Lat., from Kalends], system of reckoning time for the practical purpose of recording past events and calculating dates for future plans. The calendar is based on noting ordinary and easily o...

topology

(Encyclopedia)CE5 Möbius strip: On the ordinary flat loop (A), an ant walking along the middle of the strip will pass only around the outside of the strip. If the strip is cut along the dotted line, twisted onc...

Roman law

(Encyclopedia)Roman law, the legal system of Rome from the supposed founding of the city in 753 b.c. to the fall of the Byzantine Empire in a.d. 1453; it was later adopted as the basis of modern civil law. Most aut...