What makes us creative? What can make us more creative? And where do truly creative people find their inspiration? These are questions that Kurt Andersen and Julie Burstein have been asking for over a decade on PRI's arts and culture program Studio 360. Kurt is the host of the show. Julie is its former executive producer. And this week, a new book penned by Julie, with a forward by Kurt, hits stores. It's called "Spark: How Creativity Works," and it features insights from some of the greatest creative minds of our time, including Chuck Close, Yo Yo Ma, Rosanne Cash, Kevin Bacon, and Joyce Carol Oates.