By Jessica Bremmer When considering World of Wonders, poet Aimee Nezhukumatathil’s collection of essays about the wonders, great and small, of the natural world, perhaps it is best to begin at the end. The book’s final essay, “Firefly (Redux),” contemplates the Photinus pyralis: “Its luminescence could very well be the spark that reminds us to make a most necessary turn—a…