Useful Links
Math
http://mathplayground.com/
http://www.everydaymathonline.com
Social Studies
http://www.fourdir.com/the_first_californians.htm
http://www2.murrieta.k12.ca.us/alta/grade4/tribes/
http://californiaexplorers.tripod.com/
http://web.oakschool.org/Student_Resources/CA_Explorers.html
http://missions.bgmm.com/
http://www.californiamissions.com/
http://ceres.ca.gov/ceres/calweb/geology/goldrush.html
http://www.pbs.org/wgbh/amex/goldrush/
Science
http://www-istp.gsfc.nasa.gov/Education/Imagnet.html
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html
http://www.eia.doe.gov/kids/energyfacts/sources/electricity.html
http://www.livescience.com/electricity/
General
http://www.google.com
http://www.yahooligans.com
http://www.dictionary.com/
http://www.thesaurus.com/
http://pbskids.org/
http://www.wikipedia.com
http://www.discovery.com