about.com's chemistry guide has instructions for how to make a polymer bouncing ball. Once again, the main ingredient, as with most of the science projects is borax. Beyond that it's just cornstarch and glue and some food coloring to make it pretty.
Good for ages 7 and up.
Get the instructions here:
http://chemistry.about.com/od/demonstrationsexperiments/ss/bounceball.htm
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