When I looked at the photo in this article, I didn’t see a “pentagonal shape” in the swirling water. I saw a sine wave, wrapped around a circle. I was immediately reminded of the Bohr–de Broglie model of electron orbits forming standing waves. Rather than swirling water and glycol forming “unexplained” polygons, isn’t this simply a standing-wave phenomenon?
Ellery Frahm Minneapolis, Minn.
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