Mechanical Model, 270 Pendulums (IMAGE) ETH Zurich Caption This image shows mechanical model consisting of 270 pendulums that are connected by small springs. The pendulums behave just like a topological insulator. Credit Heidi Hostettler / ETH Zurich 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.