After pulling Neal Stephenson’s ebook of Reamde off Amazon on Tuesday, early this morning, Amazon emailed to tell readers they could replace their copy. “The version you received had Missing Content that have been corrected,” they wrote. (Or, apparently, their machines wrote. So glad the “Missing Content” “have been corrected.”) And here’s how it works: “If you wish to receive the updated version, please reply to this email with the word ‘Yes’ in the first line of your response. Within 2 hours of receiving the e-mail any device that has the title currently downloaded will be updated automatically if the wireless is on.” It’s a strange kind of revision, right? At some point, the book you’re reading will be silently replaced with a new version of the book you’re reading — AND GUESS WHAT, it’ll force you to lose your place, so take a screenshot of your page or location number. Anyway, apparently some underpaid kids at HarperCollins did some really fast digital proofreading over the last 48 hours. (It’s a big book! 1056 pages!) But what was the Missing Content! Did I read (past) the Missing Content already? Is Neal Stephenson super-mad? So many Missing Answers.