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refraction
(Encyclopedia)refraction, in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass. O...Moss, Sir Stirling Craufurd
(Encyclopedia)Moss, Sir Stirling Craufurd, 1929–2020, British auto racing driver. Known for his sportsmanship, speed, and courage, Moss became a full-time driver on the Grand Prix circuit in 1953. He subsequently...quarter horse
(Encyclopedia)quarter horse, American breed of light horse that originated during the colonial era, partly from Arabian ancestry (see Arabian horse). The name refers to the horse's reputation for speed at the quart...ergonomics
(Encyclopedia)ergonomics, the engineering science concerned with the physical and psychological relationship between machines and the people who use them. The ergonomicist takes an empirical approach to the study o...wind shear
(Encyclopedia)wind shear, a sudden, drastic change in wind direction or speed over a comparatively short distance. Most winds travel horizontally, as does most wind shear, but under certain conditions, including th...air traffic control
(Encyclopedia)air traffic control, the system by which airplanes are safely routed into and out of major airports. Air traffic control in the United States is centered in a number of regional control centers that r...Yeager, Chuck
(Encyclopedia)Yeager, Chuck (Charles Elwood Yeager) yāˈgər [key], 1923–2020, American aviator, b. Myra, W.Va. An ace fighter pilot during World War II, he was a military test pilot during the early postwar yea...catamaran
(Encyclopedia)catamaran kătˌəmərănˈ [key], watercraft made up of two connected hulls or a single hull with two parallel keels. Originally used by the natives of Polynesia, the catamaran design was adopted by ...radial velocity
(Encyclopedia)radial velocity, in astronomy, the speed with which a star moves toward or away from the sun. It is determined from the red or blue shift in the star's spectrum. ...mass, in physics
(Encyclopedia)mass, in physics, the quantity of matter in a body regardless of its volume or of any forces acting on it. The term should not be confused with weight, which is the measure of the force of gravity (se...Browse by Subject
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