Nanfu Wang grew up under China’s one-child policy and never questioned it. “You don’t know that it’s something initiated and implemented by the authority,” she tells The New Yorker’s Jiayang Fan. “It’s a normal part of everything. Just like water exists, or air.” But when Wang became pregnant she started to understand the magnitude of the law—and the suffering that it caused. Wang’s documentary, “One Child Nation,” explores the effects of one of the largest social experiments in history. She uncovers stories of confusion and trauma, in Chinese society at large and within her own family. After Wang’s uncle had a daughter, his family forced him to abandon her at a local market so that he and his wife could try for a son. “He stood there, across the street, watching to see if somebody would come and take the baby,” Wang tells Fan. “He wanted to bring her home, but his mom threatened to commit suicide. . . . He felt so torn. There was no right decision.”