Vortex Loop Formation (image) University of Chicago Caption A vortex loop begins to form a knot during a demonstration in the laboratory of William Irvine, professor in physics at the University of Chicago. Credit Robert Kozloff/University of Chicago Usage Restrictions News organizations may use this image in connection with reports about the work of Dustin Kleckner and William Irvine. 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.