No, it's not like everybody's opening up their fallout shelters. But c'mon, there has been a certain Cold War quality to the past week. This time, though, it's international trade and not tactical nukes that's the real weapon. So today, a Marketplace special: "How I Learned to Stop Worrying and Love the Global Economy." We get the perspective on the ground in Ukraine, and give a breakdown of exactly which parts of Ukraine's economy have the most impact in the world. And in this global economy, we look at what the idea of a global superpower really means.