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Audion
Elementary radio tube developed by L. De Forest (patented 1907). It was the first triode vacuum tube, incorporating a control grid as well as a cathode and an anode. It was capable of more sensitive reception of wireless signals than were the electrolytic and Carborundum detectors then in use. The Audion made possible live radio broadcasting and became the key component of all radio, telephone, radar, television, and computer systems before the invention of the transistor.


Jason
In Greek legend, the leader of the Argonauts. He was the son of Aeson, king of Iolcos in Thessaly. Raised by Chiron after his father's half-brother Pelias seized Iolcos, he returned as a young man and was promised his inheritance if he could bring back the Golden Fleece. After an adventurous voyage, he won the fleece with the help of Medea. He married her, and the two returned to Iolcos, where Medea murdered Pelias. Driven out by Pelias's son, they sought refuge with King Creon of Corinth. When Jason deserted Medea for Creon's daughter, Medea killed her own children by Jason.


judo
Martial art that emphasizes the use of quick movement and leverage to throw an opponent. Its techniques are generally intended to turn an opponent's force to one's own advantage rather than to oppose it directly. The opponent must be thrown cleanly, pinned, or mastered through the application of pressure to arm joints or the neck. Judo is now practiced primarily as sport. It became an Olympic sport in 1964; women's judo was added in 1992. The sport evolved out of jujitsu in late-19th-cent. Japan.


-->Su Song

Chinese scholar and administrative and financial expert in the imperial bureaucracy. His Illustrated Pharmacopoeia (1070) revealed his knowledge of drugs, zoology, metallurgy, and related technology. An armillary clock that he built to serve as the basis of calendrical reform was housed in a 35-ft (11-m) tower and powered by a waterwheel and chain drive; its mechanism anticipated techniques that would not be used in Europe for hundreds of years.


Tucson
City (pop., 1996 est.: 449,000), SE Arizona. It lies along the Santa Cruz River on a Sonoran Desert plateau rimmed by mountains. In 1700 the Spanish founded a mission nearby, and in 1776 the small walled pueblo of Tucson was made a Spanish presidio (fort). It remained the province's military headquarters under Mexican rule. The U.S. acquired the territory through the 1853 Gadsden Purchase. It was the territorial capital 1867-77. It grew with the arrival of the railroad in 1880, and the discovery of silver at nearby Tombstone and copper at Bisbee. Its dry, sunny climate and unique desert locale have made it a popular tourist and health resort and retirement community. It is the seat of the Univ. of Arizona (1885).

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