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rugby, game

(Encyclopedia)rugby, game that originated (1823), according to tradition, on the playing fields of Rugby, England. It is related to both soccer and American football. The game is said to have started when a Rugby S...

Stieglitz, Alfred

(Encyclopedia)Stieglitz, Alfred stēgˈlĭts [key], 1864–1946, American photographer, editor, and art exhibitor, b. Hoboken, N.J. The first art photographer in the United States, Stieglitz more than any other Ame...

X-ray astronomy

(Encyclopedia)X-ray astronomy, study of celestial objects by means of the X rays they emit, in the wavelength range from 0.01 to 10 nanometers. X-ray astronomy dates to 1949 with the discovery that the sun emits X ...

sunspots

(Encyclopedia)sunspots, dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The spots are darker because the temperature of the spots is lower than that of the surro...

mystery

(Encyclopedia)mystery or mystery story, literary genre in which the cause (or causes) of a mysterious happening, often a crime, is gradually revealed by the hero or heroine; this is accomplished through a mixture o...

swimming

(Encyclopedia)swimming, self-propulsion through water, often as a form of recreation or exercise or as a competitive sport. It is mentioned in many of the classics in connection with heroic acts or religious rites....

boxing

(Encyclopedia)boxing, sport of fighting with fists, also called pugilism and prizefighting. Amateur boxing, while not free from debate, has in recent decades taken steps to ensure safety and objective judging. Th...

modulation, in communications

(Encyclopedia)CE5 Modulation modulation, in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulatin...

Dickens, Charles

(Encyclopedia)Dickens, Charles, 1812–70, English author, b. Portsmouth, one of the world's most popular, prolific, and skilled novelists. Charles Dickens is one of the giants of English literature. He wrote fro...

artificial intelligence

(Encyclopedia)artificial intelligence (AI), the use of computers to model the behavioral aspects of human reasoning and learning. Research in AI is concentrated in some half-dozen areas. In problem solving, one mus...