Plastic Rattleback
Spin the Rattleback clockwise and watch it stop, rattle up and down and then spin in the other direction! A science curiosity whose ancient and mysterious properties capture the attention of all ages. NC-14685
$3.00Search Products
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Classic Drinking Bird
This timeless novelty is a scientific wonder, using the properties of thermodynamics to keep it in constant bobbing motion. NC-3905
$9.00