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International Geophysical Year

(Encyclopedia) International Geophysical Year (IGY), 18-month period from July, 1957, through Dec., 1958, during a period of maximum sunspot activity, designated for cooperative study of the solar-…

aurora borealis

(Encyclopedia) aurora borealis2bôrˌēălˈĭs [key] and aurora australisaurora borealisôstrāˈlĭs [key], luminous display of various forms and colors seen in the night sky. The aurora borealis of the…

coin

(Encyclopedia) coin, piece of metal, usually a disk of gold, silver, nickel, bronze, copper, aluminum, or a combination of such metals, stamped by authority of a government as a guarantee of its real…

Herzog, Werner

(Encyclopedia) Herzog, Werner, 1942–, German director, screenwriter, and producer; originally named Werner Stipetic. A leading contemporary German filmmaker, Herzog is known for his vivid and poetic…

gender

(Encyclopedia) gender [Lat. genus=kind], in grammar, subclassification of nouns or nounlike words in which the members of the subclass have characteristic features of agreement with other words. The…

John Chrysostom, Saint

(Encyclopedia) John Chrysostom, SaintJohn Chrysostom, Saintkrĭsˈəstəm, krĭsŏsˈ– [key] [Gr.,=golden-mouth], c.347–407, Doctor of the Church, one of the greatest of the Greek Fathers. He was born in…

Tacitus, Roman historian

(Encyclopedia) Tacitus (Cornelius Tacitus), c.a.d. 55–c.a.d. 117, Roman historian. Little is known for certain of his life. He was a friend of Pliny the Younger and married the daughter of Agricola.…

chromatography

(Encyclopedia) chromatographychromatographykrōˌmətŏgˈrəfē [key], resolution of a chemical mixture into its component compounds by passing it through a system that retards each compound to a varying…

Plant Kingdom

(or Plantae ) Virtually all other living creatures depend on plants to survive. Through photosynthesis, plants convert energy from sunlight into…