Xiang Li and Masashi Ohira (IMAGE) Hokkaido University Caption Xiang Li, corresponding author, and Masashi Ohira, first author of this study (Photo: Xiang Li). Credit Xiang Li Usage Restrictions This image is copyrighted, but may be used to report this release, if credited as instructed. License Original 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.