Schlieren Images (IMAGE) American Institute of Physics Caption Schlieren images of coughs with varying degrees of face covering. Credit Padmanabha Prasanna Simha, Indian Space Research Organisation Usage Restrictions Journalists may use this image only with appropriate credit. 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.