How to spin a coin for two minutes

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When I worked at the Nature Company back in the 90s we sold these. I had no idea why they were interesting until this video.

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I was hoping for a vacuum bell.

That’s no coin…

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Ah, Euler’s Disk. The story of how it was discovered and perfected is a fun read, and all engineering curiosity (rather than purely mathematical).

If I remember correctly, my mirror isn’t perfectly flat, but slightly concave to enhance the spolling effect.

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