IT was midsummer when Beijing International Airport received a group of 500 young guests - a delegation of college students from California, USA. They came for the "New Century, Silk Road" activity. In the following two days, they not only visited the Beijing University of Traditional Chinese Medicine and the China Millennium Monument, but also got together with 500 of their Chinese counterparts at the China Millennium Monument southern square. During their visit to world famous Tsinghua University, American students talked animatedly with contemporaries and teachers.