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Jackson, Andrew

(Encyclopedia)Jackson, Andrew, 1767–1845, 7th President of the United States (1829–37), b. Waxhaw settlement on the border of South Carolina and North Carolina (both states claim him). The greatest popula...

dark matter

(Encyclopedia)dark matter, material that is believed to make up nearly 27% of the mass of the universe but is not readily visible because it neither emits nor reflects electromagnetic radiation, such as light or ra...

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...

Erie Canal

(Encyclopedia)Erie Canal, artificial waterway, c.360 mi (580 km) long; connecting New York City with the Great Lakes via the Hudson River. Locks were built to overcome the 571-ft (174-m) difference between the leve...

Franklin, Sir John

(Encyclopedia)Franklin, Sir John, 1786–1847, British explorer in N Canada whose disappearance caused a widespread search of the Arctic. Entering the navy in 1801, he fought in the battle of Trafalgar. On his firs...

Irving, Washington

(Encyclopedia)Irving, Washington, 1783–1859, American author and diplomat, b. New York City. Irving was one of the first Americans to be recognized abroad as a man of letters, and he was a literary idol at home. ...

Arnold, Benedict

(Encyclopedia)Arnold, Benedict, 1741–1801, American Revolutionary general and traitor, b. Norwich, Conn. As a youth he served for a time in the colonial militia in the French and Indian Wars. He later became a pr...

zirconium

(Encyclopedia)zirconium zərkōˈnēəm [key], metallic chemical element; symbol Zr; at. no. 40; at. wt. 91.224; m.p. about 1,852℃; b.p. 4,377℃; sp. gr. 6.5 at 20℃; valence +2, +3, or +4. Zirconium is a very ...

Smuts, Jan Christiaan

(Encyclopedia)Smuts, Jan Christiaan yän krĭsˈtyän smŭts [key], 1870–1950, South African statesman and soldier, b. Cape Colony. Of Boer (Afrikaner) stock but a British subject by birth, he was educated at Vic...

Rhodophyta

(Encyclopedia)Rhodophyta rōdŏfˈətə [key], phylum (division) of the kingdom Protista consisting of the photosynthetic organisms commonly known as red algae. Most of the world's seaweeds belong to this group. Me...