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  • Nada Scientific Happy and Sad Balls - Pack of 2

Nada Scientific Happy and Sad Balls - Pack of 2

Item #: 562957
$10.79 $8.09
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Nada Scientific Happy and Sad Balls have virtually the same density, mass and appearance. When these balls are thrown down, one bounces while the other hits the surface and lies there. This is a great aid for every momentum and collision study. Displays different physical and behavioral properties. Balls with 1 inch diameter, come with activity guide and is sold as 2 per pack.