General Science

• Science.gov  A virtual cornucopia of science information provided by various US government agencies; the search engine looks at 30 databases and 1,700 Web sites; links are arranged in an easy-to-navigate fashion and are listed alphabetically by topic; its scope is broad, the quality and reliability are excellent.
• Academy of Natural Sciences
• ARKive created and maintained by a British nonprofit group Wildscreen, ARKive is a freely accessible online repository of digital images of animal and plant species from around the globe; some areas require QuickTime and/or Flash
• Dinosauria On-Line
• Eric Weisstein's Treasure Troves of Science this site is an authoritative resource for students wanting to learn more about mathematics and scientific topics
• Eurekalert News server for up-to-date research
• Everyday Mysteries: Fun Science Facts From the Library of Congress
• The Exploratorium Intended as a virtual museum of science, art, and human perception
• Federation of American Scientists a well-respected advocacy and advising organization; founded by members of the Manhattan Project 
• Frank Potter's Science Gems Particularly useful for the K-12 lesson plans included on the site.
• GrayLIT Network  a portal to more than 1 million full-text technical reports form numerous government agencies; e.g. DOE, DOD, EPA, NASA, and so on.
• Institute for Science and International Security nonprofit research organization focused on this specific topic
• NewScientist: Special Reports on Key Topics in Science and Technology   funded and supported by New Scientist magazine, there is a long list of free science and technology hot topic news and short articles. As a commercial site there are ads peppered throughout but as one reviewer points out the sites currency and comprehensivenewss will keep anyone posted on the lastest important science and technology news with briefs and short articles that are a joy to read.
• NSDL: The National Science Digital Library  funded by the National Science Foundation, this portal is designed to create an online library of high quality resources and tools that support innovation in teaching and learning at all levels of science
• Origins: Antarctica: Scientific Journeys From McMurdo to the Pole concise information on many intersting geophysical and biological phenomena and the methods used to collect them.
• Science Netlinks an essential site; one reviewer stated "all K-12 science teachers, whether well or ill prepared, and their students, will find this site interesting, useful, and easy to navigate"
• Tree of Life Home Page
• WWW Virtual Library: Medicine and Health
• WWW Virtual Library: Microscopy
• Scirus 
  Named for an historical Greek seer, this search engine was developed by Elsevier--one of the world's largest scientific publishers--as a search engine for scientific information. Scirus does find more information that is scientific in nature than the average search engine, however users should be aware that this source does not evaluate Web sites. Pseudoscientific and spoof sites are among the results that can be retrieved. In summary: a useful search engine whose "hits" must still be evaluated with care.

History of Science

• Academy of Natural Sciences-Library-Digital Collections  a portion of the Ewell Sale Stewart Library site which hosts some intriguing historical content; for example, American Natural Science in the First Half of the Nineteenth Century
• Alexander Graham Bell Family Papers at the Library of Congress 1862-1939
• Catalog of the Scientific Community in the 16th and 17th Centuries  Rice University; prepared by distinguished historian of science Richard Westfall (1924-1996), and now supported by the Galileo Project.
• Celebrating 50 Years of DNA  hosted by the Cold Spring Harbor Laboratory.
• Of related interest:Linus Pauling and the Race for DNA  Oregon State University Library offers a first person history about the race to solve the structure of DNA from Pauling's perspective.
• Computer History Musuem Currently 9 (nine) online exhibits; 2,000 web pages and thousands of images
• Center for History of Physics
• ECHO: History of Science, Technology, Industry The site began as part of the WWW Virtual Library, the site is now part of ECHO Exploring & Collecting History Online. Very comprehensive with excellent links.
• Einstein Archives Online Materials from, and supported by the Einstein Archives at Hebrew University and the Einstein Papers Project at the California Institute of Technology; 3,000 images and 900 documents as of Fall 2006.
• The Electric Ben Franklin an excellent introduction to the life and work of Benjamin Franklin, including descriptions of the kite experiment and other electrical experiments.
• The Evolution of the Conservation Movement, 1850-1920
• History of the Internet: Internet for Historians (and just about everyone else) Historical Institute of Leiden University, Netherlands; can be slow loading
• IEEE Virtual Museum Presents within a historical perspective a basic understanding of the principles of electricity and magnetism along with many of their applications.
• Internet History   Computer History Museum
• Internet History of Science Sourcebook
• Lawrence and His Lab Lawrence and His Laboratory was first published in 1981, in honor of Berkeley Lab's 50th anniversary. This Web edition marks its 65th anniversary.
• Linus Pauling Research Notebooks recipient of both the Nobel Chemistry Prize (1954) and Peace Prize (1962), this is a collection of 46 handwritten bout notebooks covering the period from 1922-1994. The notebooks contain research notes, calculations, data, theories, and conclusions in various scientific disciplines; they also contain personal musings and autobiographical entries.
• MedHist: The Guide to History of Medicine Resources on the Internet  Now part of Intute: Health & Life Sciences site.
• The Newton Project  Formed in 1998 this project's goal is to make all Newton's works available in a form suitable for research by professional scholars and for browsing by an informed public. Main categories are Catalogue of Manuscripts, About Newton and His Life, and Newton's Archival Legacy. The project intends to include not only Newton's scientific papers but his alchemical and theological writings as well.
• Samuel F. B. Morse Papers at the Library of Congress, 1793-1919  comprised of about 6,500 items, or approximately 50,000 images, that document Morse's invention of the electromagnetic telegraph, his participation in the development of telegraph systems in the US and abroad, his career as a painter, his family life and travels. A rich and well-designed site.
• Transistorized: The History of the Invention of the Transistor    a site supported by PBS; provides an excellent background on "the most important invention of the 20th century."

Astronomy, Astronautics

• American Astronomical Society
• Astrobiology at NASA Astrobiology professes to study organisms that exist only in theory. The site links the user to every aspect of astrobiology available.
• Astrobiology Magazine the site has a link to NASA with an excellent search function; the magazine makes astrobiology readily available to anyone; its Web site is visually beautiful and responds quickly even on dial-up systems.
• The Astrobiology Web  Introduction for laypersons, K-12 teachers, college students
• Astronomical Society (Peoria)
• Astronomy for All good general site, but many pop-up ads
• The Eight [or Nine] Planets: A Multimedia Tour of the Solar System
• Encyclopedia Astronautica Contains both technical and general information.
• The Extrasolar Planets Encyclopedia
• The Galileo Project  Rice University; as its name implies a site dedicated to Galileo and his times.
• Gazetteer of Planetary Nomenclature
• Hubble Space Telescope--Discoveries
• NASA Home Page  
• The NASA Astrophysics Data System an essential reference tool for researchers; four bibliographic databases with a total of nearly four million records; Astronomy and Astrophysics; Instrumentation; Physics and Geophysics; and preprints in Astronomy
• NASA Ames' Research Center Missions  see the Mars Exploration Missions
• NASA / IPAC Extragalactic Database  the database can be searched for data such as position and red shift for extragalactic objects; in addition NED provides a searchable knowledge base of information relevant to astronomy and astrophysics.
• NASA Planetary Science Research Discoveries
• Near Earth Object Program This web site is filled with links and easy-to-follow information concerning asteroids and comets that approach Earth's orbit.
• Solar System Simiulator well-designed, topic-specific; most images are available as JPEG or TIFF files
• StarDate Online
• Views of the Solar System
• Your Sky Sky Maps, Horizon Views, Virtual Telescope

Physics

• Atmospheric Sciences 
• College Physics for Students of Biology and Chemistry
• DC Physics  and
• Help for Physics Students both sites were created and are maintained by Doug Craigen, a former university physics professor who now develops science and technical web sites. The audience for these two sites is primarily undergraduate students.
• Elemental Data Index The home page of this site belies the incredible amount of information contained in its database.
• Expore Fermilab's Science Adventures  Fermi National Accelerator Laboratory
• Google Web Directory: Physics A Choice review states:The quality, reliability, and authority of the content are generally good, though Google itself is not directly responsible for the content. The scope of the material is very borad, and the organization is thematic and alphabetical.
• HyperPhysics From Georgia State University, the site offers information and exercises for a wide range of topics of interest to undergraduates studying physics.
• Learn Physics Today
• Martindale's The Reference Desk: The Virtual Physics Center
• Meteorology: The Online Guides
• NIST Physical Reference Data
• NOVA: The Elegant Universe  the site includes the entire PBS program in QuickTime & RealVideo formats divided into 24 segments.
• The Official String Theory Web Site
• Physics 2000  A very interactive physics tutorial site, supported by the University of Colorado.
• Physics Central  Maintained by the American Physical Society, the site attempts to communicate to the general public the excitement and importance of contemporary chemsitry.
• PhysicsWeb: Global News and Information
• PhysLink: The Ultimate Physics Resource
• Visual Quantum Mechanics Funded through the National Science Foundation, this site instructs high school and college students in quantum mechanics without resorting to higher-level mathematics.
• Web Physics Created to help teachers use Web technology to teach undergraduate physics.
• WWW Virtual Library: Physics
• Zona Land: Education in Physics and Mathematics Offers explanations and examples of classical physics theorems, with practical interactive JAVA applets and excellent 3-D animation.

A Few Selected Engineering Sites

• Circuit Archives
  Electronic Circuit Libraries etc.
  Electronics Reference: Circuit Archives
• The Civil Engineering Virtual Library 
• Engineering WWW-Virtual Library at Edinburgh University, Scotland has been replaced by:
  TechXtra
  intute: Science, Engineering, and Technology
• Guided Tour on Wind Energy 
• IEEE Virtual Museum  An exceptionally well-designed and well-implemented site with excellent content; the museum is easy to navigate, loads fast, and has a useful Help section.
• Society of Women Engineers
• Ultimate Civil Engineering Directory 
the emphasis is on fulfilling the directory functions, not providing general information

Visitors since 5/5/2006