Lattice-Type Material (IMAGE) University of Missouri-Columbia Caption This structured lattice-type material protects against both types of energy waves -- longitudinal and sheer -- that can travel through the ground. Credit University of Missouri 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.