Lacey Pyle, Rice University (IMAGE) Rice University Caption Rice University graduate student Lacey Pyle uses a magnifying glass and tweezers to find charcoal in soil samples. Credit Photo by Jeff Fitlow/Rice University Usage Restrictions Must credit: "Jeff Fitlow/Rice University" 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.