The McGraw-Hill Encyclopedia of Science & Technology, a classic reference encyclopedia for the sciences, makes up the core of AccessScience. AccessScience provides the finest collection of science reference materials, online and fully searchable. In addition to the latest edition of the McGraw-Hill Encyclopedia of Science & Technology, AccessScience includes Research Updates from the McGraw-Hill Yearbooks, thousands of illustrations, the latest Science News headlines, over 110,000 definitions from The McGraw-Hill Dictionary of Scientific & Technical Terms, biographies of scientists, bibliographies containing more than 28,000 literature citations, links to evaluated related web sites, and much more.