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Dickinson, John

(Encyclopedia)Dickinson, John, 1732–1808, American patriot and statesman, b. Talbot co., Md. After studying law in Philadelphia and in London at the Middle Temple, he developed a highly successful practice in Phi...

Early, Jubal Anderson

(Encyclopedia)Early, Jubal Anderson, 1816–94, Confederate general, b. Franklin co., Va., grad. West Point, 1837. After fighting against the Seminole in Florida he resigned from the army (1838), studied law, and p...

isolationism

(Encyclopedia)isolationism, a national policy of abstaining from political, military, or economic alliances or agreements with other countries. Isolationism may be adopted in order to devote a country's energies to...

Manhattan Project

(Encyclopedia)Manhattan Project, the wartime effort to design and build the first nuclear weapons (atomic bombs). With the discovery of fission in 1939, it became clear to scientists that certain radioactive materi...

Burlington, cities, United States

(Encyclopedia)Burlington. 1 City (2020 pop. 23,982), seat of Des Moines co., SE Iowa, on four hills overlooking the Mississippi (spanned there by rail and highway ...

planetarium

(Encyclopedia)planetarium, optical device used to project a representation of the heavens onto a domed ceiling; the term also designates the building that houses such a device. A modern planetarium consists of as m...

Pearl Harbor

(Encyclopedia)Pearl Harbor, land-locked harbor, on the southern coast of Oahu island, Hawaii, W of Honolulu; one of the largest and best natural harbors in the E Pacific Ocean. In the vicinity are many U.S. militar...

Colorado, rivers, United States and Mexico

(Encyclopedia)Colorado [1] kŏlərădˈə, –rădˈō, –räˈdō [2] kŏlərāˈdə, –räˈdə [key]. 1 Great river of the SW United States, 1,450 mi (2,334 km) long, rising in the Rocky Mts. of N Colo., and f...

Polk, James Knox

(Encyclopedia)Polk, James Knox pōk [key], 1795–1849, 11th President of the United States (1845–49), b. Mecklenburg co., N.C. To the surprise of many, the new President proved to be his own man; he even ignor...

museums of science

(Encyclopedia)museums of science, institutions or buildings where collections relevant to science and technology are preserved and displayed to promote education and research. While the preponderance of these museu...