Visit the Public Library of Science online

The Public Library of Science (PLoS) is a nonprofit organization of scientists and physicians committed to making the world's scientific and medical literature a public resource. Everything published by PLoS in its seven journals is Open Access, and is freely available online for you to read, download, copy, distribute, and use (with attribution) any way you wish. Work published by PLoS is also deposited in PubMed Central, and PLoS publications are covered and reviewed by major news organizations such as Reuters, BBC, and The New York Times. Learn more about PLoS journals and Open Access at the PLoS website.

Scirus Scientific Search Engine

Scirus, a science-specific search engine, searches over 450 million science-specific Web pages, enabling you to quickly pinpoint scientific, scholarly, technical, and medical data that other search engines may miss. Scirus filters out non-scientific information and sites; finds peer-reviewed and pre-print items, as well as conferences, patent information, and university/company/scientist websites; and allows you to refine, customize, or save your search results, or share them via email. Journals and organizations covered by Scirus include NASA, the American Physical Society (APS), Institute of Physics (IOP), LexisNexis, PubMed, and the Society for Industrial and Applied Mathematics (SIAM).