Introducing Shenzhen, the city that rewrote China's future

China's status as a global superpower was unimaginable just half a century ago. In the 1970s, the country was overwhelmingly rural and poor. Today, it's a technological powerhouse, the world's second-largest economy and boasts bustling cities. Shenzhen is a megacity that embodies that transformation. The World's Jeremy Siegel kicks off a week-long exploration of Shenzhen with the story of how it went from being a little-known spot on China's map to its current status as a sprawling metropolis with some 20 million residents.