When Nina Riggs, who wrote the Modern Love column “When a Couch Is More Than a Couch,” died in February at age 39, she left behind a literary legacy. Over the course of the final months of her life, Nina, who happens to be the great-great-great-granddaughter of Ralph Waldo Emerson, would gather all her thoughts, fears, frustrations and hopes for her young family into “The Bright Hour: A Memoir on Living and Dying.” Her husband,  John Duberstein, joined me on Yahoo News to discuss the book and Nina’s legacy.