Tying Water in a Knot

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 extralarge applications, including untangling dynamics of the sun. More SciFri videos Untangling the Hairy Physics of Rapunzel: