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Encyclopedia SmithsonianProvides resources on a variety of science-related topics from aeronautics to zoology.
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Science.govProvides access to the government’s vast stores of scientific and technical information.
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ScienceNOWOffers the latest news from the science world including some articles in full-text.
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Science Nation"The Online Magazine That's All About Science for the People" published by the National Science Foundation.
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Science Reference Services - Library of CongressHosted by the Library of Congress, this site contains research guides, bibliographies, webcasts and other visuals for a variety of science topics including microbiology, geology, ecology, and physics.
Anatomy
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Anatomy on the InternetHosted by the Loyola University Medical Education Network, this site provides links to informative anatomy web sites.
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The Visible Human ProjectThe National Library of Medicine created this site using donated cadavers to provide "complete, anatomically detailed, three-dimensional representations" of male and female bodies, sectioned at one millimeter (male) and one-third millimeter (female) intervals.
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Winking SkullOnline anatomy atlas - some content is free.
Biology
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All About BirdsOffers information on birds including sample sounds and videos, hosted by Cornell University.
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Animal Planet Endangered SpeciesProvides information on over 40 species of animals that are endangered.
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Audubon's Birds of AmericaHosted by the University of Pittsburgh, this site provides a digitized version of John Audubon's ornithological works including Birds of America and Ornithological Biography.
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AviBase World Bird DatabaseA database containing information about all birds of the world, containing "over 19 million records about 10,000 species and 22,000 subspecies of birds, including distribution information, taxonomy, synonyms in several languages, and more."
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Butterflies of North AmericaHosted by Montana State University.
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The Cell: An Image LibraryOffers thousands of multimedia files related to the cell.
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The Internet Bird CollectionAn online video library of the world's birds.
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Map of LifeThis site allows users to explore data about the relationships between biodiversity and geography through interactive maps.
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Native Plant Information NetworkProvides a searchable database of 7,009 plant records native to North America and detailed photographs.
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Plant Information OnlineHosted by the University of Minnesota this site offers a collection of databases for plant enthusiasts.
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Plants of the World OnlineBrowse 1,127,000 global plant names, 90,100 detailed descriptions, and 195,100 images.
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USDA Food and Nutrition Information CenterWebsite created by the Food and Nutrition Information Center (FNIC) part of the the United States Department of Agriculture. This resource provides a broad range of nutrition resources for health professionals, educators, and consumers.
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World Flora OnlineThis site for online flora contains more than 350,000 species.
Chemistry
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Chem1 Virtual TextbookProvides a set of chapters dedicated to the basics of Chemistry.
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Chemistry ExplainedAn interactive chemistry encyclopedia
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eMolecules"Searching the World's Chemistry"
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NIST Chemistry WebBookLook up chemical and physical property data for chemical compounds.
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The Periodic Table of the ElementsOffers images, descriptions and nuclear/technical data about the elements.
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The Periodic Table of the Elements, in Pictures and WordsAn interactive periodic table where users can click on any element to learn additional information.
Earth Science: Astronomy, Environmental Studies, & Geology
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Astronomy OnlineThis site offers helpful information on all aspects of Astronomy.
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Climate Change-the World BankCreated by the World Bank, this site offers data sets, research papers and other information related to this topic.
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Digital Atlas of Ancient Life"A free resource to help individuals identify and better understand fossil species from particular regions and time intervals."
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Earth: A Global Map of Wind, Weather, and Ocean ConditionsUsing data from various sources, this website, allows visitors to view a, "near real-time visualization of global weather conditions."
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Earthquake Hazards ProgramHosted by the United States Geological Survey this site offers helpful earthquake-related information.
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Earth Sciences Portal - NASAEarth/Sun exploration.
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Encyclopedia of the EarthProvides information on a wide range of subjects related to the Earth, its natural environments and their interaction with society.
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Energy Information Administration (EIA)Official Energy Statistics from the US Government.
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Environmental News NetworkProvides top news stories related to the environment and has a news archive that dates back to 1970.
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Forces of ChangeThis site, from the Smithsonian's National Museum of Natural History, looks at how different types of changes are affecting life on earth.
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Google SkyThis site allows users to explore the universe and locate planets and constellations.
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HubbleSiteThis site, from the Space Telescope Science Institute (STSci) home to the space telescope, offers a variety of information about astronomy and stunning images from the telescope.
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Mineralogy DatabaseComprehensive mineral information and images. By David Barthelmy.
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NASA Multimedia PageProvides images, videos, podcasts and other resources related to past, present and future NASA missions.
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NASA Solar System ExplorationProvides photographs, diagrams, educational resources, and other sources related to the solar system.
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National Geographic: EnvironmentProvides environmental news, photos and other resources related to the environment, pollution and conservation.
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National Geographic: Natural DisastersIncludes information about tornadoes, hurricanes, floods, earthquakes, wildfires, and more. Includes fact sheets and short videos.
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National Geologic Map DatabaseView scanned images of geologic maps.
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National Resources Defense CouncilProvides a variety of information related to environmental issues.
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RealClimate: Data SourcesProvides articles, commentaries, and data sources related to the global climate situation.
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StellariumA free open source planetarium for your computer
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U.S. Geological SurveyEarth science information and links.
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United Nations - Climate ChangeProvides the latest information on climate change.
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United Nations Environment ProgrammeProvides regional and environmental information including news and United Nations Publications including e-books and annual reports.
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Web Geological Time MachineTake a tour of any and every geological time period. Hosted by UC Berkeley.
Physics
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Physics.orgPhysics & Astronomy Online.
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Physics to GoOffers an online "mini-magazine" and a collection of more than 800 searchable/browsable websites related to Physics.
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PhysLinkYour Guide to Physics on the Internet.
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PhysOrg.comProvides an array of web-based information on Physics and other sciences.