Chinese President Jiang Zemin met on August 19 with Stephen Hawking and other world-renown scientists, including Shing-tung Yau, Edward Witten, D. Gross, A. Strominger, et al., who were attending an international conference on string theory and Prof. Chinese President Jiang Zemin met on August 19 with Stephen Hawking and other world-renown scientists, including Shing-tung Yau, Edward Witten, D. Gross, A. Strominger, et al., Who were attending an international conference on string theory and Prof .