The classic “desk toy”. Using Newton’s third law has never been this much fun! Swing one ball and one ball on opposite ends swings in response. What happens when you swing two?.
$13.59 Original price was: $13.59.$8.18Current price is: $8.18.
The classic “desk toy”. Using Newton’s third law has never been this much fun! Swing one ball and one ball on opposite ends swings in response. What happens when you swing two?.
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