The National Park Service celebrates its Centennial next year. To mark the occasion, National Geographic Magazine is devoting its May 2016 issue solely to the country’s first national park – Yellowstone. And not only is this issue focused on one place – all of the content has been written by just one author – a first for the publication. David Quammen is the writer and journalist who has been tasked with this feat. He tells Wyoming Public Radio’s Caroline Ballard he got involved at the brainstorming stage, and thought he’d like to write an article for the issue.