Great Boiling Spring, Nev. (IMAGE) DOE/Joint Genome Institute Caption To learn more about microbial dark matter, sediment samples were collected from Great Boiling Spring in Nevada and sequenced. This is one of nine sampling sites for the study published in Nature July 14, 2013. Credit Brian Hedlund, University of Nevada, Las Vegas Usage Restrictions use as credited 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.