Sandwich Structure (IMAGE) Ecole Polytechnique Fédérale de Lausanne Caption The drone's resilience comes from a unique combination of stiff and elastic layers. Credit Alain Herzog / EPFL Usage Restrictions None License Licensed 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.