This updated second edition of The Gale Encyclopedia of Science covers all major areas of science, engineering and technology, as well as mathematics and the medical and health sciences. Consisting of approximately 2,000 alphabetically-arranged entries, the Encyclopedia's user-friendly format makes the broad scope of information easy to access. Entries typically describe scientific concepts, provide overviews of scientific areas and, in some cases, define terms. Longer entries conclude with a bibliography. Value added features include approximately 800 photographs and 400 line drawings; tables and charts; extensive cross-referencing and a subject index.