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geology

(Encyclopedia)geology, science of the earth's history, composition, and structure, and the associated processes. It draws upon chemistry, biology, physics, astronomy, and mathematics (notably statistics) for suppor...

Rembrandt Harmenszoon van Rijn

(Encyclopedia)Rembrandt Harmenszoon van Rijn or Ryn rĕmˈbrănt, Du. rĕmˈbränt härˈmənsōn vän rīn [key], 1606–69, Dutch painter, etcher, and draftsman, b. Leiden. Rembrandt is acknowledged as the greate...

Portugal

(Encyclopedia)CE5 Portugal pôrˈchəgəl [key], officially Portuguese Republic, republic (2015 est. pop. 10,418,000), 35,553 sq mi (92,082 sq km), SW Europe, on the western side of the Iberian Peninsula and inc...

evolution

(Encyclopedia)CE5 Plant and animal evolution [Modified from Alfred Gunderson in Brooklyn Botanic Garden Leaflets, Ser. 18, No. 4 (1930); used by permission.] evolution, concept that embodies the belief that ex...

geography

(Encyclopedia)geography, the science of place, i.e., the study of the surface of the earth, the location and distribution of its physical and cultural features, the areal patterns or places that they form, and the ...

Middle Ages

(Encyclopedia)Middle Ages, period in Western European history that followed the disintegration of the West Roman Empire in the 4th and 5th cent. and lasted into the 15th cent., i.e., into the period of the Renaissa...

colleges and universities

(Encyclopedia)colleges and universities, institutions of higher education. Universities differ from colleges in that they are larger, have wider curricula, are involved in research activities, and grant graduate an...

Luther, Martin

(Encyclopedia)Luther, Martin, 1483–1546, German leader of the Protestant Reformation, b. Eisleben, Saxony, of a family of small, but free, landholders. At Wittenberg the iconoclasts under Carlstadt had institut...

physics

(Encyclopedia)physics, branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this na...

atom

(Encyclopedia)CE5 Bohr-Rutherford atom CE5 Probability distribution of the electron in the hydrogen atom: A. Ground state B. Highly excited state atom [Gr.,=uncuttable (indivisible)], basic unit of matte...