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probability

(Encyclopedia)probability, in mathematics, assignment of a number as a measure of the “chance” that a given event will occur. There are certain important restrictions on such a probability measure. In any exper...

Durango, state, Mexico

(Encyclopedia)Durango do͞orängˈgō [key], state, 47,691 sq mi (123,520 sq km), N central Mexico. The city of ...

Churchill, rivers, Canada

(Encyclopedia)Churchill. 1 River, c.600 mi (970 km) long, issuing as the Ashuanipi River from Ashuanipi Lake, SW Labrador, N.L., Canada, and flowing in an arc north, then southeast through a series of lakes to Chur...

Nobile, Umberto

(Encyclopedia)Nobile, Umberto o͞ombĕrˈtō nōˈbēlā [key], 1885–1978, Italian aeronautical engineer and arctic explorer. He designed the dirigible Norge and piloted it in the Amundsen-Ellsworth flight over t...

Leopold II, king of the Belgians

(Encyclopedia)Leopold II, 1835–1909, king of the Belgians (1865–1909), son and successor of Leopold I. His reign saw great industrial and colonial expansion. In 1876 he organized, with the help of H. M. Stanley...

Catlin, George

(Encyclopedia)Catlin, George, 1796–1872, American traveler and artist, b. Wilkes-Barre, Pa. Educated as a lawyer, he practiced in Philadelphia for two years but turned to art study and became a portrait painter i...

color index

(Encyclopedia)color index, in astronomy, difference in an object's brightness as recorded between any two well-defined bands of the electromagnetic spectrum by using optical filters of different colors. If blue and...

International Telecommunication Union

(Encyclopedia)International Telecommunication Union (ITU), specialized agency of the United Nations, with headquarters at Geneva. It was created in 1934 as a result of the merging of the International Telegraph Uni...

Antoine, André

(Encyclopedia)Antoine, André äNdrāˈ äNtwänˈ [key], 1858–1943, French theatrical director, manager, and critic. In opposition to the teachings of the Paris Conservatory, he formed (1887) his own company, th...

Hutchinson

(Encyclopedia)Hutchinson. <1> City (2020 pop. 40,006), seat of Reno co., S central Kans., on the Arkansas River; inc. 1872. It is a commercial and industrial ...