Estimated reading time: 2 minutes, 47 seconds

Books (non-fiction) are out of date the day after the book is printed.
Changing a blog post when your opinion has changed, is that honest to your readers? You could write a new post, add a link to the old one. Same with books, write a new book when your ideas are changed.
learning to know that books are products of authors with changing ideas is a topic in teaching critical reading.