Laser (IMAGE) Duke University Caption This powerful one-ton laser, capable of firing dozens of pulses a second, gives researchers a new way to detect tiny amounts of hazardous gases from up to one kilometer away, and under normal atmospheric pressure -- something that wasn't thought possible before. Credit Photo courtesy of Henry Everitt, U.S. Army and Duke University. 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.