I have to admit, this one sort of snuck up on me. Earlier this week I realized that today, and not next Friday, is the last Friday in July. How am I supposed to remember that there aren't 32 days in July? I know there's some knuckle trick but I can't be bothered. The good news is that this paper is hot off the presses, published online four days ago, and it's pretty interesting. Here's the pdf.