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LaTeX Search - Mathematical Equations in Scientific Publications.
Equation Search Engine - Free Math Help
Free Online Legal Research | Lexis® Web
BioMed Search - Biomedical Image Search Engine
Images from the History of Medicine (IHM) Images from the History of Medicine (IHM) provides access to over 70,000 images in the collections of the History of Medicine Division (HMD) of the U.S National Library of Medicine (NLM). The collection includes portraits, photographs, caricatures, genre scenes, posters, and graphic art illustrating the social and historical aspects of medicine dated from the 15th to 21st century. The records from the Images from the History of Medicine database are also searchable in LocatorPlus.
PDR Health | Rx Drug Interactions, Side Effects | Official site of physician desk reference
Topicle Search Community
ScienceRoll Medical Search - Medical Search and Clustering Engine
Athenus - The Engineering and Science Search Engine
The databases used by search engines are made by "robots" or "spiders" that automatically map the Web by following the links between sites. The directories, on the other hand, contain sites that are hand picked by human beings. Still, most search sites present search engine as well as directory results. Metasearch engines gather results from several search engines and directories.
Strategian: The Strategic Guide to Quality Information in Biology, Chemistry, Computer Science, Mathematics, Medicine, Physics, and Psychology