www.coolmath4kids.com/
www.factmonster.com/index.html (great for measurement conversions)
http://mathforum.org/yeargame/2005/
www.younginvestor.com/index.html
http://nlvm.usu.edu/en/nav/index.html (great for geometry)
U.S. Metric System Association (USMA)
www.crickweb.co.uk/ (Crickweb) (great for balancing equations)
http://hvo.wr.usgs.gov/
http://www.sallyrideclub.com/member_home.do
http://www.usgs.gov/
http://earthquake.usgs.gov/4kids//
http://kids.mtpe.hq.nasa.gov/archive/hurricane/index.html
http://www.dlese.org/dds/index.jsp
http://www.k12science.org/curriculum/weatherproj/index.html
http://www.bellmuseum.org/distancelearning/watershed/watershed2.html
http://www.womeninscience.org/
The Franklin Institute Resources for Science Learning
http://www.fi.edu/tfi/hotlists/hotlists.html
Simple Machines:
Dirtmeister�s Science Reporters Simple Machines
http://teacher.scholastic.com/dirtrep/index.htm
Young Engineers� Club: Science & Engineering Room
http://education.usace.army.mil/clubhouse/house.html
The Franklin Institute: Resources for Science Learning
http://www.fi.edu/qa96/spotindex.html
www.jimloy.com/cindy/shows/actionwithmouse/block.htm
www.aahom.org/classess/ft_pw_simplemachine.htm
Museum of Science: Leonardo Da Vinci
http://www.mos.org/leonardo/