ScienceDirect is a full-text database offering journal articles and book chapters from more than 2,500 peer-reviewed journals and 11,000 books. Older materials (back files) are available as archives for an additional charge. Its intended audience is librarians and researchers in the health sciences, life sciences, physical sciences, and engineering. It also has a nice complement of materials in the social sciences and business subject areas. It is PC compatible with Internet Explorer 7, 8, and 9, as well as Mozilla Firefox and Google Chrome. Mac compatible browsers are Google Chrome, Safari, and Firefox.