Darlene Cavalier (IMAGE) NASA/Johnson Space Center Caption This is co-investigator Darlene Cavalier sampling the Liberty Bell for microbes as part of the International Space Station Project MERCCURI investigation. Credit National Park Service Usage Restrictions National Park Service 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.