Fried dough cakes have been around seemingly forever, but for National Doughnut Day, we have the story of an innovation that helped make this treat the icon that it is today: the invention of the doughnut hole. Plus: this weekend in Chittenango, New York, east of Syracuse, it’s Oz-stravaganza, a celebration of the Wizard of Oz in the town where author L. Frank Baum was born.