I’m not sure how much I should say, or how much I can safely say, about yesterday. So I’ll ease into it by catching up on the entire week. Last week this time, I was dropping David off at O’Hare, because he was getting ready to go to a technical conference, at which he was making a couple of presentations. He’d worked hard on his slides, and I’d helped him edit them and streamline them generally. At last year’s conference, he was nervous about being up for an award, and he called me in a panic demanding to know if…