The most widely used science reference of its kind in print, the new fourth edition of this invaluable resource reinforces its position as the most complete, concise, and easy-to-use single-volume scientific and technical encyclopedia on the market today. Based on the widely acclaimed McGraw-Hill Encyclopedia of Science& Technology, Eighth Edition, this thoroughly revised and updated volume includes the latest research and findings in every major area of science and engineering. There are over 7,100 articles -- hundreds new -- on 75 broad field of study, including astronomy, life science, chemistry, physics, earth science, computers, electronics, and medicine. No other single source offers professionals, students, and science enthusiasts such comprehensive, up-to-date, and reliable information on so many topics. Copyright (C) Muze Inc. 2005. For personal use only. All rights reserved.