Stumped on what to be for Halloween this year? Well, we have found a solution that's sure to spark an endless amount of costume inspiration: your bookshelf (yes, we’re serious). Some of the best dress-up ideas can be plucked straight from the pages of some of your favorite nonfiction books. Halloween presents the perfect opportunity for kids, teachers, librarians, and parents to be anything they want to be: firefighters, astronauts, inventors, athletes, robots, and more!