Trouet Cores Old Bosnian Pine (image) University of Arizona Share Print E-Mail Caption Valerie Trouet taking a pencil-thin core from an old Bosnian pine (Pinus heldreichii) growing on Mount Olympus in Greece. Credit Greg King Copyright 2010 Usage Restrictions The photo may only be used to illustrate a story about the research described in the accompanying news release, "Jet Stream Changes Since 1960s Linked to More Extreme Weather." Please make sure to credit the photo as requested. Do not post this photo independent of the story. Share Print E-Mail 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.