The Calwood Fire (IMAGE) Proceedings of the National Academy of Sciences Caption The Calwood Fire erupts west of Boulder, CO, on October 17, 2020. Credit Image credit: Bryan N. Shuman Usage Restrictions None 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.