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Q1: Why aren't there many sizes to choose from
Newton's Balls fitness safe and dependableThe motion of this 5 ball cradle is the most addicting way to demonstrate Newton's law of conservation of momentum and energy, which makes it a great teaching tool, in addition to being fun to watch. And we've equipped each frosted glass sphere with LED, it's even more amazing. Lights react based on their position. Start a kinetic chain reaction with one ball and see how the others change color in response. One from each end set the LED to a single
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