In his bestseller “When Breath Becomes Air,” Paul Kalanithi documented his transition from rising neuroscientist to deteriorating cancer patient. Along that path, he wrestled with many of life’s difficult questions. His, wife, Dr. Lucy Kalanithi, was by his side as he worked on the book until his death in 2015. She joins us to talk about that experience before she speaks tonight at SMU. Dr. Kalanithi also spoke with the Dallas Morning News about her experience.