There seems to be no shortage of global challenges, from aging populations to political gridlocks to immigration. But solutions are emerging in unexpected places. John Kampfner, author of Braver New World, shares what he discovered traveling to 10 countries, including Japan, Estonia, and India, in search of ideas that are actually working. A self-described former "professional pessimist," he explores what countries can learn from each other and what's standing in the way.