how is it that in a world where people tweet instantly and we know people's phone numbers and what people had for breakfast this morning, how is it that a nation like north korea has remained so estranged, so out of the mainstream, so secretive from the rest of the world, literally? >> that's a great question. this is the dinosaur kingdom, in some ways. it's the most closed country in the world. it's as if time stopped in many ways right after world war ii. there's still not even a peace agreement. you still have a so-called armistice agreement. it's the last vestige of the cold war. it's the most closed countries, in many ways. there's probably less than a million cell phone users, and even those are relatively recent. it's hard to imagine. it's a real throwback and it's a real outlier from the modern world. indeed, the entire concept of north korea's politics has been to cut the wires, literally and figuratively, between the country and the outside world. >> how large is north korea's