Sarah Marcus-Donnelly: Your gorgeous new book, How to Prove a Theory, was the 2017 Jean Feldman Poetry Prize Winner. It is a meditation on grief and memory and human resilience. I have had the pleasure of listening to you read some of these poems, which made them even more tender and devastating for me. Can you tell us about the process of writing about grief? How long did it take you to write the collection? Can you share some background for this book?