Takashi Nakamura, lead author (IMAGE) Hokkaido University Caption Takashi Nakamura, lead author of this study (Photo: Takashi Nakamura). Credit Takashi Nakamura Usage Restrictions This image is copyrighted but may be used to report this press 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.