Tying a Vortex Ring into a Knot (video) University of Chicago Loading video... Caption University of Chicago physicists explain how they successfully created vortex knot in the laboratory, a feat that had long eluded scientists. Credit UChicago Creative Usage Restrictions News organizations may use this video in connection with reports about the work of William Irvine and Dustin Kleckner. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.