Nanfu Wang on going back to China – and avoiding surveillance – to make ‘One Child Nation’

“One Child Nation,” a documentary about the devastating effects of China’s one-child policy, has been nominated for many awards. But director Nanfu Wang says any film buff who has to rely on Chinese media to follow these competitions wouldn’t even know her film exists -- it's totally banned in China. Wang tells us about making “One Child Nation,” which started as a personal story and grew into something broader.