They all turned to OPEN.ED, a website hosting high-quality learning materials written by faculty in the College of Earth and Mineral Sciences. The content, created though the Open Education Resources (OER) initiative launched in 2007 by the College of Earth and Mineral Sciences (EMS) at Penn State, is free for educators and learners under a creative commons license.
https://news.psu.edu/story/626963/2020/07/28/open-education-website-connects-teachers-learners-quality-resources
