Just found a lovely hand-written thank you card in my mailbox, from a student I'd written a grad school recommendation for. He got into my old alma mater, which is particularly pleasing. But mostly I'm mentioning it here because it is so lovely to get such a card, and now I'm feeling bad (again) that I never sent thank you cards to the people who wrote me recommendation letters. I didn't know it was a thing! And now it is years too late (though I did acknowledge them in my book, which is something). But the thank you cards from students are perched in my office on a shelf, and when I am having a blue teaching day (as some, inevitably, are), I can go through and read their sweet notes and feel better about my teaching in particular, and the profession in general. So I'm passing this along, in case you also didn't know. Thank you notes for recommendation letters. It's a thing. A lovely lovely thing.