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dubnium

(Encyclopedia)dubnium do͞obˈnēəm [key], artificially produced radioactive chemical element; symbol Db; at. no. 105; mass number of most stable isotope 268; m.p., b.p., and sp. gr. unknown; valence +5. Situated ...

Henry the Lion

(Encyclopedia)Henry the Lion, 1129–95, duke of Saxony (1142–80) and of Bavaria (1156–80); son of Henry the Proud. His father died (1139) while engaged in a war to regain his duchies, and it was not until 1142...

logical positivism

(Encyclopedia)logical positivism, also known as logical or scientific empiricism, modern school of philosophy that attempted to introduce the methodology and precision of mathematics and the natural sciences into t...

Kulturkampf

(Encyclopedia)Kulturkampf ko͝olto͞orˈkämpfˌ [key] [Ger.,=conflict of cultures], the conflict between the German government under Bismarck and the Roman Catholic Church. The promulgation (1870) of the dogma of ...

apostle

(Encyclopedia)apostle əpŏsˈəl [key] [Gr.,=envoy], one of the prime missionaries of Christianity. The apostles of the first rank are saints Peter, Andrew, James (the Greater), John, Thomas, James (the Less), Jud...

irrigation

(Encyclopedia)irrigation, in agriculture, artificial watering of the land. Although used chiefly in regions with annual rainfall of less than 20 in. (51 cm), it is also used in wetter areas to grow certain crops, e...

McCarthy, Joseph Raymond

(Encyclopedia)McCarthy, Joseph Raymond, 1908–57, U.S. senator from Wisconsin (1947–57), b. near Appleton, Wis. He practiced law in Wisconsin and became (1940) a circuit judge. He served with the U.S. marines in...

Stresemann, Gustav

(Encyclopedia)Stresemann, Gustav go͝osˈtäf shtrāˈzəmän [key], 1878–1929, German statesman. A founder (1902) and director (until 1918) of the Association of Saxon Industrialists, Stresemann entered the Reic...

Rumsfeld, Donald Henry

(Encyclopedia)Rumsfeld, Donald Henry, 1932–2021, American government official, b. Chicago, Princeton Univ. (B.A., 1954). After graduating college, Rumsfeld enliste...

aerial and satellite photography

(Encyclopedia)aerial and satellite photography, technology and science of taking still or moving-picture photographs from a camera mounted on a balloon, airplane, satellite, rocket, or spacecraft. In the 19th cent....