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The Periodic Table
See the interactive periodic table. Although some elements, such as gold and iron, have been known to humans since prehistoric times, it wasn't until the 17th century that the first scientific…Theories of the Universe: The Last Train to Quarkville
The Last Train to QuarkvilleTheories of the UniverseForces, Particles, and Some Cosmological GlueSize in the MicrocosmThe Forces You Already KnowThe Particle ZooThe Last Train to Quarkville The…Last Judgment
(Encyclopedia) Last Judgment: see Judgment Day.Last Supper
(Encyclopedia) Last Supper, in the New Testament, meal taken by Jesus and his disciples on the eve of the passion. Jesus broke bread and passed a cup of wine among the disciples, identifying himself…Long Island, island, United States
(Encyclopedia) Long Island (1990 pop. 6,861,454), 1,723 sq mi (4,463 sq km), 118 mi (190 km) long, and from 12 to 20 mi (19–32 km) wide, SE N.Y.; fourth largest island of the United States and the…Valday Hills
(Encyclopedia) Valday Hills or Valdai HillsValday Hillsboth: väldīˈ, Rus. vəldīˈ [key], upland region, NW European Russia, composed of a series of glacial moraines that rise to c.1,100 ft (340 m).…Triassic period
(Encyclopedia) Triassic periodTriassic periodtrīăsˈĭk [key], first period of the Mesozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table) from 205 to 250 million years…Brewer's: Callippic Period
The correction of the Metonic cycle by Callippos. In four cycles, or seventy-six years, the Metonic calculation was seven and a-half in excess. Callippos proposed to quadruple the period…Brewer's: Canicular Period
A cycle of 1461 years or 1460 Julian years, called a “Sothic period.” When it was supposed that any given day had passed through all the seasons of the year. Source: Dictionary of Phrase…Brewer's: Renaissance Period
(The). That period in French history which began with the Italian wars in the reign of Charles VIII. and closed with the reign of Henri II. It was the intercourse with Italy, brought about…Trending
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