"The American West is an evocative term that conjures up images of cowboys and Indians, covered wagons, sheriffs and outlaws, and endless prairies as well as contemporary images ranging from national parks to the oil, aerospace, and film industries. In addition, the West encompasses not only the past and present of the area west of the Mississippi but also the frontier as it moved across each of the fifty American states, offering the promise of freedom...

Covers all major areas of science, engineering, technology, as well as mathematics and the medical and health sciences, while providing a comprehensive overview of current scientific knowledge and technology. Entries typically describe scientific concepts, provide overviews of scientific areas and, in some cases, define terms.