Mammoth tusk and midnight sun (IMAGE) Stockholm University Caption Woolly mammoth tusk and midnight sun in northeastern Siberia. Photo: Love Dalén/Stockholm University. Credit Love Dalén/Stockholm University Usage Restrictions For media use only in connection with this news release 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.