http://www.discover.com/

There are many sites sponsored by museums and zoos. The Oakland Museum of California maintains a Web site linking museums in the U.S. and throughout the world.

http://www.museumca.org/usa/index.html

Here is a partial listing:

American Association of Zoo Keepers
http://aazk.epower.net/

California Academy of Science
http://www.calacademy.org/

Cat House
http://www.cathouse-fcc.org/

Charlotte the Vermont Whale
http://www.uvm.edu/whale/whalehome.html

Chicago Academy of Sciences Nature Museum
http://www.chias.org/

The Electronic Zoo
http://netvet.wustl.edu/e-zoo.htm

Exploratorium (San Francisco)
http://www.exploratorium.edu/

Field Museum of Natural History (Chicago)
http://www.cyberspacemuseum.com/index.html

The Franklin Institute
http://sln.fi.edu/

Honolulu Community College Dinosaur Exhibit
http://www.hcc.hawaii.edu/dinos/dinos.1.html

Miami Museum of Science
http://www.miamisci.org/

Mt. Wilson Observatory
http://www.mtwilson.edu/

National Air and Space Museum
http://www.nasm.si.edu

Oklahoma City Zoo
http://www.cpb.uokhsc.edu/okc/okczoo/zoomap.html

Oregon Museum of Science and Industry
http://www.omsi.edu/explore

Sea World and Busch Gardens Animal Data Base
http://www.seaworld.org

The Smithsonian Institution
http://www.si.edu/

London Science Museum
http://www.nmsi.ac.uk/

University of California Museum of Paleontology
http://www.ucmp.berkeley.edu

http://www.enc.org/classroom/lessons

and its subsidiary sites (among others):

http://www.enc.org/classroom/lessons/nf_lesmath.htm (math lessons)

http://www.enc.org/classroom/lessons/lessci.htm (science lessons)

http://www.enc.org/classroom/lessons/lesmasci.htm (math and science lessons)

http://www.enc.org/classroom/lessons/lesmulti.htm (multi lessons)

ENC is sponsored by the U.S. Department of Education. Accessible sites include Fractal Lesson for Elementary and Middle School Students, Mathematics Problem Solving Activities, Elementary Science This Month, Virtual FlyLab, Puzzle Corner, SimSurface (changing variables and seeing what happens), Virtual Polyhedra, Virtual Cave, Virtual Earthquake, Volcano World, Virtual Heart Tour, and Electronic Prehistoric Shark Museum, Planetary Tour Guide, and Welcome to the Planets, among others.

The following sites are illustrative of other sites specifically for students and children. As the Internet develops, more and more sites of this kind will come on-line.

Questacon

http://sunsite.anu.edu.au/Questacon/

Australia's National Science and Technology Centre sponsors this site, which includes illustrated activities, including taking a virtual tour of the centre's galleries, visiting Kidspace, Hands-On Zone, and Comet Central, and discovering the excitement of model solar car racing.

Internet Educational Workbook. The Internet Educational Workbook provides a large mathematics database that is useful for practicing various skills for k-4 students.

http://www.inew.com/

206-836-8792, inew@msn.com.

The Abacus. Users with Java-capable browsers are able to use an abacus online at this site.

http://www.ee.ryerson.ca:8080/~elf/abacus/

Brain Teasers. Puzzles are posted anew each Thursday along with the answer to the previous week's puzzle. For grades 3 and up.

http://www.hmco.com/school/math/brain

Headbone Interactive is at http://headbone.com/; International Kids' Space is at http://www.ks-connection.org/; Kid's Com is at http://www.kidscom.com/.

The site "Kids On The Web" is a nothing-but-links site, but it is a good place to start when searching for good student sites. http://www.zen.org/~brendan/kids-fun.html