About 1,000 undergraduates in Shanghai form up to display the volunteer logo of Shanghai Expo, literally means heart, to celebrate the launching of an activity with the theme of collecting a million smiling faces among youngsters in Shanghai to greet the 2010 Shanghai World Expo, at Qingqingtang Square in Shanghai Jiao Tong University in Shanghai, east China, Sept. 15, 2009.[Xinhua]