Why do newspaper reporters end articles with the number 30 or the three-pound-sign symbol ###? No one knows for sure, although that never stopped journalists from debating the origin of this way of ending a story. The practice arose in a bygone era when reporters typed their copy directly onto paper and handed it over to copyboys, and needed a way to indicate the last page in case one was lost somewhere in the process. In 2007, a vestige of this old practice figured in an amusing correction in the New York Times. This is part of a complete episode.