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precession of the equinoxes
(Encyclopedia)CE5 Precession of the equinoxes (the points at which the earth's celestial equator intersects its ecliptic) is due to the slow rotation of the earth's axis around a perpendicular to the ecliptic. ...tornado
(Encyclopedia)tornado, dark, funnel-shaped cloud containing violently rotating air that develops below a heavy cumulonimbus cloud mass and extends toward the earth. The funnel twists about, rises and falls, and whe...pulsar
(Encyclopedia)pulsar, in astronomy, a neutron star that emits brief, sharp pulses of energy instead of the steady radiation associated with other natural sources. The study of pulsars began when Antony Hewish and h...Hercules, Greek hero
(Encyclopedia)Hercules both: hĕrˈəklēzˌ [key], most popular of all Greek heroes, famous for extraordinary strength and courage. Alcmene, wife of Amphitryon, made love to both Zeus and her husband on the same n...cotton
(Encyclopedia)cotton, most important of the vegetable fibers, and the plant from which the fiber is harvested. Today the leading cotton states are Texas, Georgia, Mississippi, Arkansas, North Carolina, and Louisi...fishing
(Encyclopedia)fishing, act of catching fish for consumption or display. Fishing—usually by hand, club, spear, net, and (at least as early as 23,000 years ago) by hook—was known to prehistoric people. It was pra...Mumbai
(Encyclopedia)Mumbai bŏmbāˈ [key], city (1991 pop. 3,175,000), capital of Maharashtra state, W central India, occupying c.25 sq mi (65 sq km) on Mumbai (Bombay) and Salsette islands on the Arabian Sea coast. Mum...spider
(Encyclopedia)spider, organism, mostly terrestrial, of the class Arachnida, order Araneae, with four pairs of legs and a two-part body consisting of a cephalothorax, or prosoma, and an unsegmented abdomen, or opist...Robert I, king of Scotland
(Encyclopedia)Robert I or Robert the Bruce, 1274–1329, king of Scotland (1306–29). He belonged to the illustrious Bruce family and was the grandson of that Robert the Bruce who in 1290 was an unsuccessful claim...fiber
(Encyclopedia)fiber, threadlike strand, usually pliable and capable of being spun into a yarn. Many different fibers are known to be usable; some 40 of these are of commercial importance, and others are of local or...Browse by Subject
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