Physicists Tie Water Into Knots

Reporting in the journal Nature Physics, William Irvine and Dustin Kleckner, physicists at the University of Chicago, have created a knotted fluid vortex 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, like understanding dynamics of the sun.

Source: http://www.npr.org/2013/03/15/174409388/physicists-tie-water-into-knots?ft=1&f=1007

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