Dr. Zhu Li Shan, my Lincoln, Nebraska friend visited us, in July 2002. We were awarded the Ph.D. degree at the same time in 1991.

His family is still in Lincoln Nebraska.

Our Nebraska friends. Dr. Yang S. Sheng, Dr. Ni Fan, Dr.  Zha Jingmei, Dr. Zhu Li Shan, Dr. Lu Lin and my family in S. Sheng's

home.