Surgical knot tied on a rigid support (IMAGE) Ecole Polytechnique Fédérale de Lausanne Caption Surgical knot tied on a rigid support Credit Alain Herzog / EPFL Usage Restrictions none License Original content 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.