Coming-of-age novels are a dime a dozen, but Judy Blume's Are You There God? It's Me, Margaret is one of the best known. It's such a significant work that we invited our pal Margaret H. Willison back to help us through it—she is, obviously, an expert on all things Margaret. This week we talk about our changing bodies, running for no reason, and some truly horrifying bra shopping experiences. Enjoy!