网站简介：DOE's home page is organized by topic, including Data and Prices, Efficiency, Environmental Quality, National Security, Science and Technology, and Sources and Production.
网站简介：Official site offering documentation, forums and the open source client software which permits to send and receive bitcoins.
网站简介：Gateway to US Geological Survey web resources on earthquakes, including information on recent quakes, earthquake preparedness, building seismically resistant structures, and current research topics.
网站简介：Information, member directory and many links.
网站简介：Not-for-profit organization dedicated to preserving bald eagles and protecting their environment. Also cares for eagles that are injured or orphaned at a facility at Pigeon Forge, Tennessee.
网站简介：Managed for NASA by the California Institute of Technology, JPL is the leading U.S. center for robotic exploration of the solar system.
网站简介：Design, development, manufacture and implementation of magnetic bearings. The company provides solutions where other bearings fail.
网站简介：Biweekly publication of exceptional research articles in areas including molecular biology, biochemistry, cancer research, cell biology, developmental biology, genetics, immunology, microbiology, neurobiology, plant biology, structural biology and virology.
网站简介：Staff, structure, schools, faculties, departments, college, study, research areas, key figures and facts, institutes, centers and laboratories; projects, seminars, journals, working and policy papers, databases.
网站简介：Daily updates of news and features from Nature, the international scientific journal. Also offers conference news, archives and job search.
网站简介：Information for students, parents and faculty about academic, athletic and research programs. Student and faculty home pages. Financial aid, library and computing services.
网站简介：This is the homepage for OSHA. It has information related to job related safety and health issues, as well as compliance related resources.
网站简介：Information about the Falcon Rocket family developed by SpaceX.
网站简介：Interactive homework problems. Topics include Pre-Algebra, linear Algebra and other college Algebra.
网站简介：A non-governmental organization promoting the development of standardization and related activities in the world. Includes code of ethics, structure, strategies and annual reports.
网站简介：Manufactures a wide range of IC's for applications such as automotive, communications, and consumer electronics, among others. Formerly Motorola Semiconductor.
网站简介：The Physics Classroom serves students, teachers and classrooms with easy-to-understand and ready-to-use lessons, interactive activities, and engaging curriculum.
网站简介：Mainly a Euro and US Dollar exchange for Bitcoin and Litecoin, but also offers markets for several other cryptocurrencies and fiat currencies.
网站简介：Interactive live charts of the major Bitcoin markets.
网站简介：Provides online subject pool management. Includes a list of features and customer testimonials.
网站简介：A center for R users to find and read bloggers who write about the statistical programming language, R.
网站简介：Worldwide snow forecasts. Regional and local snow forecast maps including the U.S., Europe, New Zealand and Australia.
网站简介：Online book by Tony R. Kuphaldt on dc and ac electric circuits, semiconductor devices, analog and digital circuits.
网站简介：Complete guide to times in every time zone in the world.
网站简介：Offers news and feature stories plus audio and video programmes and clips.