I often have the need to search for science and engineering related information on the internet and frequently Google doesn't suffice because of commonalities between unrelated search terms. Furthermore, top rated sites in Google and other more pedestrian search engines are not often the in-depth, technically focused sites I'm looking for. Enter Scirus: for scientific information only. I've been trying out Scirus for a few weeks and I'm impressed. I think the slightly oxymoronic breadth and selectiveness of the database speaks for itself:
The Range of Scientific Content Scirus Covers
Scirus returns results from the whole Web, including access-controlled sites that other search engines don't index. Scirus currently covers over 167 million science-related Web pages, including:
• 58.5 million .edu sites
• 18 million .org sites
• 6.8 million .ac.uk sites
• 18.6 million .com sites
• 5 million .gov sites
• Over 45 million other relevant STM and University sites from around the world
In addition to Web pages, Scirus indexes the following journal sources:
• 12.7 million MEDLINE citations
• 4.5 million ScienceDirect full-text articles
• 1.2 million patents from the USPTO
• 785,000 Beilstein abstracts
• 261,000 e-prints on ArXiv.org
• 3,653 BioMed Central full-text articles
• 10,600 NASA technical reports
• 1,800 e-prints on e-prints on CogPrints
• 1237 preprints from the Mathematics Preprint Server
• 765 preprints from the Chemistry Preprint Server
• 452 preprints from the Computer Science Preprint Server