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| Happy/Sad Balls
(LSE) |
Need a good, reliable source for inelastic and elastic collision balls?
These intriguing balls, popularly called "happy and sad*", are always in stock. No minimums or import charges!
*Our sad ball is so remarkably sad that it's known by some as "dead."
Kit includes: one "happy" neoprene ball (elastic); one "sad" polynorbornene (inelastic); our usual detailed instructions with several experiments.
With many uses at both the middle and high school levels, these balls enjoy repeat sales. |
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