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Rattleback - Plastic Assorted Colors - Pack of 10 with Teacher's Guide
The Rattleback is a long and thin half-elliptical shape formed in plastic so that it has a slightly offset center of gravity. This offset gravity causes the Rattle back to spin in directional rotation of choice, usually counterclockwise. If you attem...
Scientifics Direct Resonance Bowl
Create Your Own Dancing Water Fountain Display Due to the vibrations caused by the rubbing of the handles, the water surface begins to ripple around the rim. Soon water drops shoot up, quickly becoming continuous streams, like tiny fountain jets. The...
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