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| Address | P.O. Box 219 Batavia, IL 60510 |
| Phone | 800-452-1261 |
| Fax | |
| flinn@flinnsci.com |
DC91760
Price: FREE
Happy and Sad balls appear the same, but do they have the same properties? Bounce the balls, put them in the freezer, heat them in boiling water, compare their densities—observe the very interesting results.