Opinion: Free Textbooks From Rice OpenStax: Too Good to Be True?

"As open educational resources, each and every textbook is free—you read it correctly, free—to view, download, and modify as you wish. All content is sourced by publishing experts and vetted by dozens of peer reviewers, and textbooks can be viewed online, downloaded as a PDF, or purchased as an iBook or traditional print textbook. This year alone, nearly 392,000 students relied upon OpenStax textbooks, at a savings of almost $100 per student."