The internet has been alive lately with the news that Chen Xiaolu, the son of Marshal Chen Yi, made a public apology to the teachers he had attacked during the Cultural Revolution. I was talking about the news with two American visitors as I showed them around the National Museum of China, just off Tiananmen Square. Tucked away in a corner we noticed that this major historical event is represented by one photo - Mao Zedong receiving the Red Guards - and a one-sentence caption: "A catastrophe mistakenly launched by the leaders."