Tweet Nonfiction writers can glean insight from Barbara Walters advice on Oprah’s Master Class. After years of interviewing celebrities and past presidents, she shares a few of her inside secrets for a successful interview. Curiosity. Curiosity may have killed the cat. But it makes an interviewer’s career. Walters says, “I think that the interviewer/correspondent should have curiosity. If you don’t have curiosity, you’re not going to make it. Listen. Good listening skills are a dying art. We’re often so busy trying to think up the next genius question, we miss out on important revelations, body language and the truth behind what our subjects…