“The OpenStax Astronomy Book: Reaching Half a Million Readers, Creating a Community of Adopters” was the title of the Open Ed 2021 session presented by Andrew Fraknoi. The OpenStax Astronomy is a free textbook: http://openstax.org/details/astronomy OpenStax, Fraknoi mentioned, has the goal of creating free textbooks for college courses. Fraknoi was part of the project as […]