Many people collect used books, but only a used book connoisseur could possibly collect used bookmarks. In the same way it can be interesting to read a biography of an author, to glimpse the life behind the pages, it can be equally as insightful to look at a snapshot, or note, left behind by the reader. Michael Popek started a blog featuring the unique bookmarks he found in the pages that pass through his family's used bookstore in Oneonta, New York. Some of his finds include a letter from Albert Camus written 17 days before his death, found in a copy of Camus' The Stranger. A note that begins, "Dear—, I cannot believe what a slime you are," found in an obstetrics care guide. A printed copy of William Butler Yeat's poem, "A Prayer for My Daughter," found in Cutting: Understanding and Overcoming Self-Mutilation.