网站简介：National Library of Medicine / National Institutes of Health. Offers many important databases (PubMed, GenBank, OMIM) and some tools.
网站简介：An information source for scientific, technical, and medical research. Subscription required for some sections.
网站简介：Social community for researchers, fostering collaboration and knowledge exchange among researchers worldwide.
网站简介：Translation, dictionary, conjugation, grammar for English, French, Spanish, German, Italian, Russian, Chinese, Arabic, Japanese, Hebrew, Polish, Dutch ...
网站简介：A veritable cornucopia of streetwise lingo, posted and defined by its readers.
网站简介：TED (Technology, Entertainment, Design) is an invitation-only event where the world's leading thinkers and doers gather to find inspiration. Initially an annual conference, the scope of TED has expanded to include a bi-annual global conference, a humanitarian prize, and free audio/video podcasts of extraordinary talks.
网站简介：Offers free language instruction where users translate documents and vote on the accuracy of those translations. Contains a description of how it works, a blog, and a study of the project's efficacy.
网站简介：Nature.com provides access to all Nature Publishing Group journals, online databases and services, including Nature News, and the social network for scientists Nature Network. Nature Publishing Group publishes products across the life, physical and applied sciences and clinical medicine. Nature.com hosts more than 70 journals, including Nature . The site also include Nature Jobs, which features access to job listings, editorial content about scientific careers and other information.
网站简介：Finite element analysis and mechanical event simulation software for virtual prototyping. This was formerly Algor.
网站简介：Developers of MATLAB, Simulink and Stateflow. The MathWorks offers a set of integrated products for data analysis, visualization, application development, simulation, model-based design, and code generation.
网站简介：elsevier.com is the web resource for the publishing house Elsevier, specializing in scientific, technical and medical information. Find all products, support and contacts, and information about the company.
网站简介：With a look into the pages of the magazine, plus interactive features, maps, photography, news, exhibitions, things for kids, educational features, and hosting live events. Searchable web site.
网站简介：美国国家气象局（National Weather Service）是美国商务部国家海洋和大气管理局属下的六个部门之一，成立于1870年，总部位于马里兰州银泉，主要负责为美国及其属地、邻近水域及海洋地区提供天气、水文及气候预报和警报，藉以?；ど撇凸揖?。
网站简介：Clinical experts provide current medical information and news on health topics.
网站简介：The Tropical Prediction Center.
网站简介：News and feature articles from the magazine.
网站简介：HowStuffWorks.com is an award winning site covering thousands of topics within its own 10 channels: Auto, Computer, Electronics, Entertainment, Health, Home, Money, People, Science and Travel.
网站简介：Scans of print journals, with 10 major math journals (requires subscription).
网站简介：Authoritative weekly newspaper focusing on international politics and business news and opinion..
网站简介：Fully automated electronic archive and distribution server for research papers, hosted at the Los Alamos National Laboratory.