This article was originally published on mentalfloss.com as Quiz: Can You Name All 45 U.S. Presidents in 10 Minutes?. The Oval Office in 2010. So far, the United States has had 45 presidents in its roughly 250-year history. Most people can name some of them-but can you name all of them in 10 minutes?

Later in the year, President Obama and Prince Charles took part in the D-Day ceremony at the Normandy American Cemetery and Memorial in Colleville-sur-Mer, during the commemorations marking the 65th anniversary of the June 6, 1944 allied landings in Normandy.