What if educational resources could be available in a limitless variety of variants, each adapted to the tools students actually use? In this episode, David talks to Lily about a project she has been working on to convert open statistics and data science textbooks into the PreTeXt format. The discussion highlights why PreTeXt’s semantic structure and separation of authoring from publishing enable systematic changes across a book, supporting making software-specific and software-agnostic variants to tailor the books to various contexts where different approaches are more valuable.