 From classic movies into modern reality. That was Pulitzer Prize winning journalist Jane Perlez, the former Beijing bureau chief for the New York Times. She's reported for many years on China's transformation into a global superpower. She joins us again today to examine one specific type of power, nuclear weapons. Jane, welcome back. Good to be here, Marco. It is not science fiction. I mean, China does have a nuclear arsenal and it's changing its stance on how it can be used. What do we know about the scope of China's nuclear program?