The Math Forum Combined archive and portal to web resources, educational issues, help forums, mailing lists, and teaching materials. http://mathforum.org/

Eric Weisstein's World of Mathematics Glossary of terms. Material ranges from undergraduate to research level. http://mathworld.wolfram.com/

Mathematics Archives Combined archive and directory of mathematics web sites, mailing lists, and teaching materials. At University of Tennessee. http://archives.math.utk.edu/

Glossary of Math Terms Explains commonly used words specialized to this field. Includes examples and some graph illustrations. http://www.dpi.state.wi.us/dpi/standards/mathglos.html

Knot a Braid of Links Award/review service for other math web sites and web pages, with a new selection each week. http://www.cms.math.ca/Kabol/knotlinks.html

The Mathematical Atlas Dave Rusin's survey of research-level mathematics, with introductory articles for non-mathematicians and hyperlinked bibliographies in each of dozens of research areas. http://www.math.niu.edu/~rusin/known-math/

Frequently Asked Questions in Mathematics Covers diverse topics such as algebra structure, names for large numbers, how to compute pi and games. http://db.uwaterloo.ca/~alopez-o/math-faq/

Physics 1968 Biography and Nobel Lecture. http://www.nobel.se/physics/laureates/1968/