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lungfish

(Encyclopedia) lungfish, common name for any of a group of fish belonging to the families Ceratodontidae, Lepidosirenidae, and Protopteridae, found in the rivers of Australia, South America, and…

New Castle

(Encyclopedia) New Castle. 1 City (1990 pop. 4,837), New Castle co., N Del., on the Delaware River. Mineral, metal, food, paper, and gypsum products are among its varied manufactures. It is also a…

cement

(Encyclopedia) cement, binding material used in construction and engineering, often called hydraulic cement, typically made by heating a mixture of limestone and clay until it almost fuses and then…

ceramics

(Encyclopedia) ceramicsceramicssərămˈĭks [key], materials made of nonmetallic minerals that have been permanently hardened by firing at a high temperature, or objects made of such materials. Most…

bibliography

(Encyclopedia) bibliography. The listing of books is of ancient origin. Lists of clay tablets have been found at Nineveh and elsewhere; the library at Alexandria had subject lists of its books.…

The Journals of Lewis & Clark: March 16, 1805

by Meriwether Lewis and William Clark March 15, 1805March 17, 1805March 16, 1805 March 16th, Mr. Gurrow a Frenchman who has lived many years with the Ricares & Mandans shewed us…

Muhammad Ali Timeline

The ups and downs of the champ's career 1942 Born Cassius Marcellus Clay, Jr., on Jan. 17, in Louisville, Ky., to Odessa and Cassius, Sr. (a sign and mural painter…

Poincaré Conjecture

A million-dollar math problem by Borgna Brunner Henri Poincar© posed his famously bedeviling math problem more than a century ago. The Clay Institute's Millennium Problems Birch and…