"World Book" editors lay out major articles distinctly, often starting them on a page of their own, perhaps with a two-column heading. Materials are reviewed and authored by experts. It recognizes that one of the primary uses of general-purpose encyclopedias is students' work on school reports. For instance, every article for a U.S. state has a box giving information about such things as the official state bird and tree; each President of the United States gets a very distinctive look with an oversized portrait, a timeline and significant historical events that occurred during that president's administration.