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statistics

(Encyclopedia)statistics, science of collecting and classifying a group of facts according to their relative number and determining certain values that represent characteristics of the group. The most familiar stat...

stencil

(Encyclopedia)stencil, cutout device of oiled or shellacked tough and resistant paper, thin metal, or other material used in applying paint, dye, or ink to reproduce its design or lettering upon a surface. Designin...

spire

(Encyclopedia)spire, high, tapering structure crowning a tower and having a general pyramidal outline. The simplest spires were the steeply pitched timber roofs capping Romanesque towers and campaniles. In later Ro...

Cai Guo-Qiang

(Encyclopedia)Cai Guo-Qiang, 1957–, Chinese painter and a sculptor especially known for using gunpowder as a medium and explosions and fireworks as means of artistic expression, b. Quanzhou, Fujian prov., studied...

pi

(Encyclopedia)pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol for pi is π. The ratio is the same for all circles and is approximately 3.1416. It is of great importance in...

Zhao Ziyang

(Encyclopedia)Zhao Ziyang or Chao Tzu-yang both: zhou zēyäng [key], 1919–2005, Chinese Communist leader. He joined the party in 1938, was active as a local party leader during World War II, and by the 1960s was...

poison gas

(Encyclopedia)poison gas, any of various gases sometimes used in warfare or riot control because of their poisonous or corrosive nature. These gases may be roughly grouped according to the portal of entry into the ...

Justinian I

(Encyclopedia)Justinian I jŭstĭnˈēən [key], 483–565, Byzantine emperor (527–65), nephew and successor of Justin I. He was responsible for much imperial policy during his uncle's reign. Soon after becoming ...

Moscow, city, Russia

(Encyclopedia)Moscow mŏsˈkou, –kō [key], Rus. Moskva, city (1991 est. pop. 8,802,000), capital of Russia and of Moscow region and the administrative center of the Central federal district, W central European R...

Chicago, city, United States

(Encyclopedia)Chicago shĭkäˈgō, shĭkôˈgō [key], city (2020 pop. 2,746,388), seat of Cook co...