Sandra Matz, Columbia Business School, on personalized ads. Kristyn Vitale from Oregon State University’s Human/Animal Interaction Lab on cat training. William Chopik, Michigan State University, on prejudice towards people with disabilities. Andres Resendez from the University of California on the history of Native American enslavement. Author Helen Wilkes on her book ‘The Aging of Aquarius, Igniting Passion and Purpose as an Elder’ and ‘Letters from the Lost.’