COMPUTER SCIENCE

http://www.archive.org/
The Internet Archive: Building an "Internet Library"
Growing at a rate of about 10 terabytes a month, the Internet Archive is an ambitious endeavor that has succeeded over the past six years in assembling a 100-terabyte (more than 10 billion pages) digital library of the World Wide Web. A favorite stop is the Wayback Machine, which lets you view select pages of many different Web sites as they appeared in past years.

http://www.computerhistory.org/
Computer History Museum
Established in 1996, the Computer History Museum houses one of the largest collections of computing artifacts in the world, including more than 3,000 artifacts, 2,000 films and videotapes, 5,000 photographs, 2,000 linear feet of catalogued documentation and gigabytes of software. A searchable timeline covers significant innovations in hardware and software technology, milestones in commercial applications and artificial intelligence, and biographical sketches of pioneers from 1945 to 1990.

http://livinginternet.com/
The Living Internet
We've come to rely on it for so many things, but how does the Internet work? How was it invented? The Living Internet tells you all that, plus it explains advanced programming techniques for the Internet, troubleshooting methods and related information. And talk about authoritative: this collaborative Web book gets its descriptions from many of the people who developed the Internet itself.

ENGINEERING & TECHNOLOGY

http://www.howstuffworks.com/
How Stuff Works
This site offers a comprehensive array of clearly written explanations on the function of all manner of things, from how jet engines run to how M1 tanks work to how digital cameras make their colorful images. This info-packed Web site also offers lots of explanatory images and animations, including--boob-tube fans, take note--what happens when you shoot your TV.

http://www.brantacan.co.uk/bridges.htm
Bridge Building-Art and Science
The fundamentals of bridge design, engineering and construction are discussed in this well-produced site. It considers all aspects of bridges beyond the technical. After you've absorbed some of the basics, you can try your hand as an engineer and design your own model bridges.

MATHEMATICS

http://mathworld.wolfram.com/
Eric Weisstein's World of Mathematics
This site lives up to its billing as "The Web's Most Extensive Mathematics Resource." Whatever you are interested in regarding numbers, geometry, mathematical theory and so forth, it's here in one form or another. Among the subjects covered are: calculus and analysis, discrete mathematics, algebra, geometry and topology. Each topic area leads to an exhaustive listing of the various elements, and finally to detailed pages on each.

PHYSICS

http://www.colorado.edu/physics/2000/
Physics 2000
This site promises "an interactive journey through modern physics"-and it doesn't disappoint in that regard. There are areas that focus on the underlying basic science concepts behind many devices used today and classical quantum physics; the generous use of applets help bring the concepts to full-motion life.

http://www.superstringtheory.com/
The Official String Theory Web Site
This well-written Web site provides an accessible survey of superstrings, the leading theory of what makes up the universe at its deepest level. Basic and advanced tracks tie superstrings to particle physics, cosmology and black holes, while a People section introduces some of the star researchers in the field.