Information at the foundation of modern science and technology from the Physics Laboratory of the National Insitute of Standards and Technology (http://www.nist.gov/). Constants include: universal, electromagnetic, atomic and nuclear, physico-chemical, adopted values, non-SI units, conversion factors for energy equivalents, X-ray values, frequently used constants, extensive listings. Find the correlation coefficient between any pair of constants.

Developed by Cambridge Healthtech Institute, this glossary allows users to search on a known term, or browse terms alphabetically, or by category. Links to related Web sites are included within term glosses.

This service uses data from the US Census and a supplementary list of cities around the world to find the latitude and longitude of two places, and then calculates the distance between them (as the crow flies). It also provides a map showing the two places, using the Xerox PARC Map Server.

This dictionary includes: all the units of the International System of Units (SI); many other units of the metric system used in everyday life or in science, either currently or recently; various non-metric scientific units such as the astronomical unit, the electronvolt, and the parsec; all the units of the English traditional systems I've encountered that can be defined with reasonable precision; selected traditional units from cultures other than English; and certain measurement terms and notations which are not "units of measurement" in a strict sense, but which are used much as if they were.

A clickable world atlas. Includes continent and world region maps, and ocean floor maps.

Intute is a free online service providing you with access to the very best Web resources for education and research. The service is created by a network of UK universities and partners. Subject specialists select and evaluate the websites in our database and write high quality descriptions of the resources.

This collection of Mathematics-related resources is maintained by the Florida State University Department of Mathematics as a free service to the online community.

Information on thousands of prescription and over-the-counter medications is provided through two drug resources -- MedMaster, a product of the American Society of Health-System Pharmacists (ASHP), and the USP DI Advice for the Patient , a product of the United States Pharmacopeia (USP).

Welcome to MedlinePlus, a goldmine of good health information from the world's largest medical library, the National Library of Medicine. Health professionals and consumers alike can depend on it for information that is authoritative and up to date. MedlinePlus has extensive information from the National Institutes of Health and other trusted sources on over 650 diseases and conditions. There are also lists of hospitals and physicians, a medical encyclopedia and a medical dictionary, health information in Spanish, extensive information on prescription and nonprescription drugs, health information from the media, and links to thousands of clinical trials. MedlinePlus is updated daily and can be bookmarked at the URL: medlineplus.gov. There is no advertising on this site, nor does MedlinePlus endorse any company or product.

Type the word that you would like to find. If you're not sure of the spelling, type the first few letters, followed by an asterisk(*).

The adam Health Illustrated Encyclopedia includes over 4,000 articles about diseases, tests, symptoms, injuries, and surgeries. It also contains an extensive library of medical photographs and illustrations. For more information about adam, see its content review board.

megaConverter.com is an ever-growing set of weights, measures and units conversion/calculation modules. megaConverters allow users to discover things like how many seconds old they are, the difference between a gallon in the USA and a gallon in the UK, how many nanometers in an inch, how many quarts in a chaldron, and what the heck a nebuchadnezzar is. Every module has its own on-line info system built in. You don't have to count on your fingers here! For just about anything you can think of, megaConverter can show you its equivalent. They're convenient, educational and fun. megaConverter will become an indispensable source for conversions as well as interesting information (and hundreds of jokes) on the megaResource pages. Be careful, you're bound to learn something. There are a ton (that's 4,540,000 carats) of modules available now and many more coming.

You've seen other atlases. They're typically big books of paper maps. The pages in this atlas are here on the Internet whenever you need them. This is a new portrayal of America in maps. We use new technologies, but we honor traditions of accuracy, reliability, and innovation. You've found the single best Federal source for national maps and geographic information on the Web. The people and places of the United States are here. Topics include agriculture, biology, boundaries, climate, environment, geology, government, history, mapping, people, transportation, and water.

NCES of the US Department of Education is the primary federal entity for collecting and analyzind data that are related to education in the United States and other nations. Search for colleges, public schools and school districts, private schools, public libraries, Nation's report card, elementary and secondary public school data, postsecondary education data.

Founded in 1901, NIST is a non-regulatory federal agency within the U.S. Commerce Department's Technology Administration. NIST's mission is to develop and promote measurement, standards, and technology to enhance productivity, facilitate trade, and improve the quality of life.