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Aratus, Greek statesman and general
(Encyclopedia)Aratus, d. 213 b.c., Greek statesman and general of Sicyon, prime mover and principal leader of the Second Achaean League. His objective at first was to free the Peloponnesus from Macedonian dominatio...pole, in electricity and magnetism
(Encyclopedia)pole, in electricity and magnetism, point where electric or magnetic force appears to be concentrated. A single electric charge located at a point is sometimes referred to as an electric monopole. An ...pre-Columbian art and architecture
(Encyclopedia)pre-Columbian art and architecture, works of art and structures created in Central and South America before the arrival of Europeans in the Western Hemisphere. For many years the regions that are now ...centripetal force and centrifugal force
(Encyclopedia)CE5 Centripetal and centrifugal forces: When a ball is swung in a circle at the end of a string, centripetal and centrifugal forces act as shown above. centripetal force and centrifugal force, act...Camp Fire Boys and Girls
(Encyclopedia)Camp Fire Boys and Girls, American organization for boys and girls from birth to age 21, originally the Camp Fire Girls, for girls 6 to 18 years old. It was founded (1910) by Luther Halsey Gulick (186...age grade and age set
(Encyclopedia)age grade and age set, differentiation of social role based on age, commonly found in small-scale societies of North America and East Africa. Age sets are a type of sodality (nonresidential groups tha...Braintree, town and district, England
(Encyclopedia)Braintree, town and district, Essex, E England, between the Pant (Blackwater) and Brain river valleys. It has textile, plastic, and metal-product indust...vertical takeoff and landing aircraft
(Encyclopedia)vertical takeoff and landing aircraft (VTOL), craft capable of rising and descending vertically from and to the ground, thus requiring no runway. While a balloon or an airship has obvious VTOL capabil...Vienna, city and province, Austria
(Encyclopedia)Vienna vēĕnˈə [key], Ger. Wien, city and province (1991 pop. 1,539,848), 160 sq mi (414 sq km), capital and largest city of Austria and administrative seat of Lower Austria, NE Austria, on the Dan...Belt, Great, and Little Belt
(Encyclopedia)Belt, Great, and Little Belt, straits: see Store Bælt and Lille Bælt, straits, Denmark. ...Browse by Subject
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