Underwater Wing (image) University of Chicago Caption When accelerated to more than 100 g in a specially prepared water tank, hydrofoils like these can generate knotted vortex loops. Physicists have unsuccessfully attempted to create knotted vortices in the laboratory for more than a century. 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.