Official results of the 55th International Mathematical Olympiad (IMO), held July 3-13 in Cape Town, South Africa, show the United States in second place, behind China. Taiwan (3), Russia (4), and Japan (5) round out the top five. Complete rankings of the more than 100 countries that participated are available here.
The oldest and largest scientific Olympiad, the IMO is a rigorous two-day math competition held each summer in a different location around the globe. Each day participants take a 4.5-hour, three-question exam featuring deceptively simple-looking problems that in fact require considerable ingenuity to solve. Read more.