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Scheduled Maintenance:
Our website will be unavailable starting Friday, April 10 at 5:00 PM CST and will be back online Monday, April 13 at 6:00 AM CST.
We appreciate your patience.
Free Shipping on orders over $199
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.
