PERPETUAL ANDREW MOTION Tori Marchiony profiles former U.K. Poet Laureate Sir Andrew Motion. He's five decades in, and still finding room to grow. VIJAY IYER: KEY CHANGES Among the most highly regarded jazz pianists of his time, Vijay Iyer has made his instrument of choice an instrument of discovery. SUSAN CHOI: INTERROGATOR OF TRUTH Susan Choi's books reflect her skepticism of authority. As Tori Marchiony reports, she even questions the credibility of the characters she creates.