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natural childbirth
(Encyclopedia)natural childbirth: see birth.natural gas
(Encyclopedia)natural gas, natural mixture of gaseous hydrocarbons found issuing from the ground or obtained from specially driven wells. The composition of natural gas varies in different localities. Its chief com...natural law
(Encyclopedia)natural law, theory that some laws are basic and fundamental to human nature and are discoverable by human reason without reference to specific legislative enactments or judicial decisions. Natural la...natural rights
(Encyclopedia)natural rights, political theory that maintains that an individual enters into society with certain basic rights and that no government can deny these rights. The modern idea of natural rights grew ou...natural selection
(Encyclopedia)natural selection: see selection. ...Bridges, Calvin Blackman
(Encyclopedia)Bridges, Calvin Blackman, 1889–1938, American geneticist, b. Schuyler Falls, N.Y., grad. Columbia (B.S., 1912; Ph.D., 1916). In his research he collaborated with T. H. Morgan, A. H. Sturtevant, and ...Bridges, Robert Seymour
(Encyclopedia)Bridges, Robert Seymour, 1844–1930, English poet. In 1882 he abandoned medical practice to devote himself to writing. An excellent metrist, he wrote many beautiful lyrics and longer poems, noted for...Petrified Forest National Park
(Encyclopedia)Petrified Forest National Park, 93,533 acres (37,881 hectares), E Ariz.; est. as a national monument 1906, designated a national park 1962. A part of the Painted Desert, it contains the largest known ...conservation of natural resources
(Encyclopedia)conservation of natural resources, the wise use of the earth's resources by humanity. The term conservation came into use in the late 19th cent. and referred to the management, mainly for economic rea...Little Bighorn Battlefield National Monument
(Encyclopedia)Little Bighorn Battlefield National Monument: see Little Bighorn, river; National Parks and Monuments (table). ...Browse by Subject
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