fun bit of physics
 

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Very cool! I'm not surprised about the ball that sat in place. I assume the gyroscopic tendencies impact it. But the circular motion was interesting.

The description on the circular motion was interesting, and was pretty much instantly obvious once they started the explanation.

Interesting. Thanks for sharing

Cool stuff. Not intuitive at all.

Before it started, I expected the "sit in place and spin" thing, do to inertia. I did not expect the small orbit thing.