Reporting in the journal Nature Physics, William Irvine and Dustin Kleckner, physicists at the University of Chicago, describe the knotted fluid vortex they created in the lab — a scientific first, they say. The knots resemble smoke rings — except these are made of water, and they’re shaped like pretzels, not donuts. Understanding knottiness has extra-large applications, including untangling dynamics of the sun.
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