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interference

(Encyclopedia)CE5 Constructive interference: Two crests or two troughs meet and combine (A, B, C). Destructive interference: A crest and a trough meet and cancel each other (D, E, F). interference, in physics, ...

submarine

(Encyclopedia)submarine, naval craft capable of operating for an extended period of time underwater. Submarines are almost always warships, although a few are used for scientific, business, or other purposes (see a...

motion picture photography

(Encyclopedia)motion picture photography or cinematography, photographic arts and techniques involved in making motion pictures. See also photography, still. Cinematography developed as a separate craft ve...

Angola

(Encyclopedia)CE5 Angola ăng-gōˈlə [key], officially Republic of Angola (2020 est. pop. 32,870,000), including the exclave of Cabinda, 481,351 sq mi (1,246,700 sq km), SW Africa...

army

(Encyclopedia)army, large armed land force, under regular military control, organization, and discipline. With the advent of railroads and, later, highway systems it became possible after the mid-19th cent. to mo...

Milton, John

(Encyclopedia)Milton, John, 1608–74, English poet, b. London, one of the greatest poets of the English language. Milton's theology, although in the Protestant tradition, is extremely unorthodox and individu...

Madison, James

(Encyclopedia)Madison, James, 1751–1836, 4th President of the United States (1809–17), b. Port Conway, Va. When Jefferson triumphed in the election of 1800, Madison became (1801) his secretary of state. He se...

map

(Encyclopedia)map, conventionalized representation of spatial phenomena on a plane surface. Unlike photographs, maps are selective and may be prepared to show various quantitative and qualitative facts, including b...

topology

(Encyclopedia)CE5 Möbius strip: On the ordinary flat loop (A), an ant walking along the middle of the strip will pass only around the outside of the strip. If the strip is cut along the dotted line, twisted onc...

evidence

(Encyclopedia)evidence, in law, material submitted to a judge or a judicial body to resolve disputed questions of fact. The rules discussed in this article were developed in England for use in jury trials. Today, t...