What happens when you show the tank man photo to young Chinese students?

It is one of the most iconic photographs of the 20th century: an unidentified man stopping the advance of a convoy of tanks through Tiananmen Square.Key points:Yesterday was the 30th anniversary of the Tiananmen Square massacreIn 1989, the Chinese military broke up student demonstrations in the squareChina strictly censors public discussion of the protests and the subsequent massacre"Tank man" only stared down the Chinese military briefly, but he entered the history books as a universal symbol of peaceful resistance. Thirty years after the government's crackdown on students who filled the square demanding democratic reform, many young students today have never seen the photo.Those who have seen it are reluctant to discuss it in public.In 1989, the main student district in Beijing's north-west, Haidian, was a hotbed of political action.But today's students have grown up under a government that refuses to teach the history of the Tiananmen Square uprising — referred to in China as "June...