Sarah Vowell is a humorist, historian and animated superhero. She's the author of "Assassination Vacation," "The Partly Cloudy Patriot" and a longtime contributor to public radio's "This American Life." You may recognize her voice as Violet Parr from Pixar's "The Incredibles." Sarah joins Kevin Pang in studio to talk about her writing lair, humor as writing device, and the two things she turns to whenever writer's block strikes.