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sequoia

(Encyclopedia)sequoia sĭkwoiˈə [key], name for the redwood (Sequoia sempervirens) and for the big tree, or giant sequoia (Sequoiadendron giganteum), both huge, coniferous evergreen trees of the bald cypress fami...

Salisbury, Robert Arthur Talbot Gascoyne-Cecil, 3d marquess of

(Encyclopedia)Salisbury, Robert Arthur Talbot Gascoyne-Cecil, 3d marquess of sôlzˈbərē [key], 1830–1903, British statesman. He entered Parliament in 1853 as a Conservative and devoted himself for 50 years to ...

Thackeray, William Makepeace

(Encyclopedia)Thackeray, William Makepeace thăkˈərē [key], 1811–63, English novelist, b. Calcutta (now Kolkata), India. He is important not only as a great novelist but also as a brilliant satirist. In 1830, ...

rickettsia

(Encyclopedia)rickettsia rĭkĕtˈsēə [key], any of an order (Rickettsiales) of very small microorganisms, many disease-causing, that live in vertebrates and are transmitted by bloodsucking parasitic arthropods s...

Van Buren, Martin

(Encyclopedia)Van Buren, Martin, 1782–1862, 8th President of the United States (1837–41), b. Kinderhook, Columbia co., N.Y. He was again the presidential candidate of the Democratic party in 1840, but he was ...

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...

Garfield, James Abram

(Encyclopedia)Garfield, James Abram, 1831–81, 20th President of the United States (Mar.–Sept., 1881). Born on a frontier farm in Cuyahoga co., Ohio, he spent his early years in poverty. As a youth he worked as ...

continental drift

(Encyclopedia)CE5 Continental drift (arrows indicate the directions of motion of the landmasses) A. Proposed reconstruction of the supercontinent Pangaea indicating the major present landmasses B. Proposed recon...

chemical industry

(Encyclopedia)chemical industry, the business of using chemical reactions to turn raw materials, such as coal, oil, and salt, into a variety of products. During the 19th and 20th cent. technological advances in the...

light

(Encyclopedia)light, visible electromagnetic radiation. Of the entire electromagnetic spectrum, the human eye is sensitive to only a tiny part, the part that is called light. The wavelengths of visible light range ...