On the first, second, and third Friday of every month, it’s Tales From the Drum—the Mended Drum, that is. We also bring you three-minute long mini-episodes, cleverly entitled Pratchips (like potato chips, see?) every Monday-Thursday. All of these are (usually) about the places, spaces, races, and other words that end in aces of the Discworld, that pizza-shaped place (but no anchovies) that rides through space on the backs of the massive elephants Tubul, Berilia, Jerakeen and Great T’Phon, which themselves stand atop the 10,000 mile-long world Turtle, A’Tuin. (According to the dwarfs, there...