Dr. Wan-Xi Yang and his classmates stayed together with their Ph.D. supervisor, Prof. Nan-Shan Du at Prof. Du's home on Nov. 8, 2009. From left to right: Dr. Wan-Xi Yang, Dr. Bo-Ping Tang, Prof. Nan-Shan Du, Dr. Lan Wang, and Dr. Xian-Jiang Kang.  (Photo by Dr. Qun Wang, Professor at College of Life Sciences, East China Normal University)