The best kind of math involves doughnuts. Celebrate Krispy Kreme Doughnuts' birthday with me Friday by getting an Original Glazed Dozen for $1 when you buy any dozen! | Shaquille O' Neal

Have you ever completed the Krispy Kreme Challenge? Every winter, brave runners gather at the Memorial Belltower at NC State University for a 2.5-mile race to downtown Raleigh’s Krispy Kreme, where they attempt to eat 12 original glazed doughnuts — and then run back in under an hour. This year, we caught up with some of the racers to learn how they tackle this “unique challenge of athletic and gastrointestinal skill.” | Our State Magazine