MIRACLE IN MEMPHIS: A visit to FedEx’s SuperHub, where technology powers the global economy while you sleep. “In many ways, the SuperHub dwarfs its ‘big brother,’ Memphis International Airport. The SuperHub is a world unto itself, with a hospital, a fire station, a meteorology unit, and a private security force; it has branches of U.S. Customs and Homeland Security, plus anti-terror operations no one will talk about. It has 20 electric power generators as backup to keep it running if the power grid goes down.” Plus, talking to Fred Smith.