When nations decide to disown their troubled pasts, how does this strategic disavowal harden into social fact? In Negative Exposures, Margaret Hillenbrand investigates the erasure of key aspects of such momentous events as the Nanjing Massacre, the Cultural Revolution, and the Tiananmen Square protests from the Chinese historical consciousness, not due to amnesia or censorship but through the operations of public secrecy. Knowing what not...