<p>Yang Jisheng's The World Turned Upside Down is the definitive history of the Cultural Revolution, in withering and heartbreaking detail.<br>As a major political event and a crucial turning point in the history of the People's Republic of China, the Great Proletarian Cultural Revolution (1966?1976) marked the zenith as well as the nadir of Mao Zedong's ultra-leftist politics. Reacting in part to the Soviet Union's "revisionism" that he regarded...