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Waves of Fascination: Hex-Nuts, Bowling Balls, and Billiard Balls

I have shared a video on the phenomenon of pendulum wave motion previously. Nonetheless, the visual aspects continue to intrigue me.

These videos show the same phenomena...often with students' Ahs and Oohs and Frowns and Conjectures included:

As more of these videos exist on-line, I hope you will look at one of these and share it. How can you not?

And, feel free to build your own version...real-life demonstration removes all suspicions of video magic. Anyone have a pile of excess bowling balls?