Here are some fun and educational websites!
https://play.prodigygame.com/
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Science Websites
http://www.eia.gov/kids/
http://www.energystar.gov/index.cfm?c=kids.kids_index
http://www1.eere.energy.gov/kids/
http://www.nasa.gov/audience/forstudents/k-4/index.html
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Social Studies Websites
ccn10.com
http://www.mayankids.com/
http://www.kidskonnect.com/subject-index/16-history/250-ancient-aztec.html