Zhengji "Jim" Sheng, Rice University (image) Rice University Caption Rice University undergraduate researcher Zhengji "Jim" Sheng prepares to place samples of lettuce and caterpillars in a chamber with controlled lighting. The notation DL refers to the dark-light circadian rhythm of the caterpillar. When the circadian clock of the lettuce matches that of the caterpillar, the leaves are less likely to be eaten. Credit Jeff Fitlow/Rice University Usage Restrictions For news reporting purposes only. 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.