This book contains hundreds of well-illustrated articles which explore the most important fields of science. Based on content from the McGraw-Hill Concise Encyclopedia of Science & Technology, Fifth Edition, the most widely used and respected science reference of its kind in print, each of these subject-specific quick-reference guides features: detailed, well-illustrated explanations, not just definitions; hundreds of concise yet authoritative articles in each volume; an easy-to-understand presentation, accessible and interesting to non-specialists; a portable, convenient format; and, bibliographies, appendices, and other information supplement the articles.