This will be of interest only to those of you who are (or want to be) professional writers, or those who are incurably curious:

Deanna Hoak has posted one of her periodic essays to demistify the world of copyediting, and this time she tackles the mysteries of copyeditor's marks. A couple of these are things that I keep forgetting about (since I don't see them often enough to remember), so I'm sure they'll be completely new to many of you.