Water Testing (IMAGE) Penn State Caption Joshua Woda, a graduate student in geosciences at Penn State, measures methane concentrations in the air. Gas bubbles out of the water in the nearby stream. Credit Joshua Woda / Penn State Usage Restrictions non commercial use only 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.