Twenty-five years ago, the Chinese government ordered the military to clear Tiananmen Square of pro-democracy protesters, killing hundreds or thousands. Today, any discussion of the event is heavily censored in China, with people using coded language like "May 35th" to talk about the "June 4th" military crackdown. The Chinese government has successfully removed accounts of the massacre from history books and the Internet. Those who do discuss it risk punishment, and a survey found most Chinese students did not recognize the famous "Tank Man" photo from the event. The government also increasingly blocks foreign websites and monitors online discussions to limit any challenges to the official account that Tiananmen Square did not happen.