Into each life, some rain must fall. And so it is, on this sunny spring afternoon, we must announce that this is the final day that Gayle Osterberg, the Library’s director of communications, will be our kind, benevolent and fearless leader. She’s off for adventures outside your favorite national library, but will still be in D.C., which we will take as a consolation prize. As anyone who’s worked with Gayle knows, she’s a class act and a good friend and, no, we are not crying. It’s just the pollen.