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Physicists show that flying beer coasters will flip 0.45 seconds into flight

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The New York Times
SOURCE: https://arstechnica.com/science/2021/06/the-physics-of-why-that-flying-beer-coaster-is-nothing-like-a-frisbee/
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Summary

Without the frisbee's rounded edges, beer mats flip onto their side with a backspin.

 As said here by Jennifer Ouellette
Ars Technica
Jennifer Ouellette