Originally published at: https://boingboing.net/2018/10/05/how-to-spin-a-coin-for-two-min.html
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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). http://eulersdisk.com/history.html
If I remember correctly, my mirror isn’t perfectly flat, but slightly concave to enhance the spolling effect.
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