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feathers

(Encyclopedia)CE5 Structure of a bird feather feathers, outgrowths of the skin, constituting the plumage of birds. Feathers grow only along certain definite tracts (pterylae), which vary in different groups of ...

White, Edward Higgins, 2d

(Encyclopedia)White, Edward Higgins, 2d, 1930–67, American astronaut, b. San Antonio. While serving as pilot of Gemini 4 (June 3–7, 1965), he became the first American to perform extravehicular activity. He had...

Cayley, Sir George

(Encyclopedia)Cayley, Sir George, 1773–1857, British scientist. He is recognized as the founder of aerodynamics on the basis of his pioneering experiments and studies of the principles of flight. He experimented ...

Post, Wiley

(Encyclopedia)Post, Wiley, 1899–1935, American aviator, b. Grand Plain, Tex. He won fame in 1931 when he and Harold Gatty flew around the northern part of the earth in 8 days 15 hr 51 min. In 1933 he made a secon...

bird

(Encyclopedia)CE5 General anatomy of a bird bird, warm-blooded, egg-laying, vertebrate animal having its body covered with feathers and its forelimbs modified into wings, which are used by most birds for flight...

Commerce, city, United States

(Encyclopedia)Commerce, city (2020 pop. 12,459), Los Angeles co., S Calif., a suburb of Los Angeles; inc. 1960. An important transportation hub for S California, Comm...

Rosso di San Secondo, Piermaria

(Encyclopedia)Rosso di San Secondo, Piermaria pyĕrˌmärēˈä rôsˈsō dē sän sēkônˈdō [key], 1887–1956, Italian writer, b. Sicily. His sophisticated plays include Marionette, che passione! (1918) and La...

omen

(Encyclopedia)omen, sign or augury believed to foreshadow the future. Almost any occurrence can be interpreted as an omen. The typical omen was a natural phenomenon, such as a meteor, an eclipse, or the flight of b...

aerodynamics

(Encyclopedia)aerodynamics, study of gases in motion. As the principal application of aerodynamics is the design of aircraft, air is the gas with which the science is most concerned. Although aerodynamics is primar...

space shuttle

(Encyclopedia)space shuttle, reusable U.S. space vehicle (1981–2011). Developed by the National Aeronautics and Space Administration (NASA) and officially known as the Space Transportation System (STS), it was th...