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Tyrone, Hugh O'Neill, 2d earl of

(Encyclopedia)Tyrone, Hugh O'Neill, 2d earl of, 1540?–1616, Irish chieftain. He was the son of Matthew O'Neill, the illegitimate son of the 1st earl. Hugh succeeded his murdered older brother, Brian, as Baron Dun...

propeller

(Encyclopedia)propeller, device consisting of a hub with one or more blades that propels a craft to which it is attached by rotating its blades in a fluid such as air or water. In the latter part of the 1830s the S...

virtual reality

(Encyclopedia)virtual reality (VR) or virtual environment (VE), computer-generated environment with and within which people can interact. The advantage of VR is that it can immerse people in an environment that wou...

duck

(Encyclopedia)duck, common name for wild and domestic waterfowl of the family Anatidae, which also includes geese and swans. It is hunted and bred for its meat, eggs, and feathers. Strictly speaking, duck refers to...

pigeon

(Encyclopedia)pigeon, common name for members of the large family Columbidae, land birds, cosmopolitan in temperate and tropical regions, characterized by stout bodies, short necks, small heads, and thick, heavy pl...

aviation

(Encyclopedia)aviation, operation of heavier-than-air aircraft and related activities. Aviation can be conveniently divided into military aviation, air transport, and general aviation. Military aviation includes al...

Nez Percé

(Encyclopedia)Nez Percé nĕz pûrs, nā pĕrsāˈ [key] [Fr.,=pierced nose], Native North Americans whose language belongs to the Sahaptin-Chinook branch of the Penutian linguistic stock (see Native American langu...

Carracci

(Encyclopedia)Carracci kärätˈchē [key], family of Italian painters of the Bolognese school, founders of an important academy of painting. Lodovico Carracci, 1555–1619, a pupil of Tintoretto in Venice, was inf...

space medicine

(Encyclopedia)space medicine, study of the medical and biological effects of space travel on living organisms. The principal aim is to discover how well and for how long humans can withstand the extreme conditions ...

National Aeronautics and Space Administration

(Encyclopedia)National Aeronautics and Space Administration (NASA), civilian agency of the U.S. federal government with the mission of conducting research and developing operational programs in the areas of space e...