4 Sources Of Open-Source Textbooks

"Visualize this: A calculus teacher downloads an open-source digital calculus textbook. She deletes a chapter that isn’t relevant to her class and replaces it with one from another open digital textbook that she’s used in the past. She reads through the book, embeds several YouTube videos where relevant and an occasional humorous photo to keep students’ interest, adds links to related websites and study aides, and uses a special app to create quizzes within the text that test the students’ knowledge of the course material...."