<i>Cassiope tetragona</i> (IMAGE) Norwegian University of Science and Technology Caption Scientists can count the individual growth layers on Cassiope and can correlate growth with other environmental parameters. But new research suggests that there might be confounding environmental factors, like icing, that affect growth. Credit Brage B. Hansen, NTNU Usage Restrictions With credit to Brage B. Hansen, NTNU 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.