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clock

(Encyclopedia)CE5 A pendulum clock: Weight-driven clock mechanism clock, instrument for measuring and indicating time. Predecessors of the clock were the sundial, the hourglass, and the clepsydra. See also watc...

South African literature

(Encyclopedia)South African literature, literary works written in South Africa or written by South Africans living in other countries. Populated by diverse ethnic and language groups, South Africa has a distinctive...

teacher training

(Encyclopedia)teacher training, professional preparation of teachers, usually through formal course work and practice teaching. Although the concept of teaching as a profession is fairly new, most teachers in indus...

Jupiter, in astronomy

(Encyclopedia)Jupiter jo͞oˈpətər [key], in astronomy, 5th planet from the sun and largest planet of the solar system. Astronomers have discovered 79 satellites orbiting Jupiter, but five of those, small sate...

Saturn, in astronomy

(Encyclopedia)CE5 Saturn and its ring system as seen from Earth Saturn, in astronomy, 6th planet from the sun. Saturn has 82 confirmed natural satellites, many of which have not been named. Five of the discov...

vitamin

(Encyclopedia)vitamin, group of organic substances that are required in the diet of humans and animals for normal growth, maintenance of life, and normal reproduction. Vitamins act as catalysts; very often either t...

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...