they're reading carefully. Persnickety readers caught an error in Harry Potter and the Half-Blood Prince. Are you ready for this? Hermione gets top results in 11 subjects, even though she's only taking 10.
Where were these readers in my English 102 class? When I was teaching, you could ask them a question about the book that made it clear they hadn't even read the cover of the book, let alone paid close attention to its contents.
Then again, I must admit, Fields of Writing is not exactly Harry Potter.