Here are some great links to science web pages that have fun experiments.  Try some!

Web site name and address hyperlink
http://kidscience.about.com/kids/kidscience/

Web site name and address hyperlink
http://www.monroe2boces.org/shared/esp/

Web site name and address hyperlink
http://www.eecs.umich.edu/mathscience/funexperiments/quickndirty/preschool.html/

Web site name and address hyperlink
http://nyelabs.kcts.org/openNyeLabs.html

Web site name and address hyperlink
http://www.madsci.org/

Web site name and address hyperlink
http://www.chemfiesta.com