This book is not just a conference proceedings covering the full spectrum of physics disciplines. It is also a historic retrospective on the past generation of giants in Chinese physics. It covers the historical tributes by Nobel Laureates Lee and Yang and others to the life and works of Professors Ta-You Wu, Chien-Shiung Wu and Xie Xi-de. In the words of the title in Chinese, as we drink the water let us ponder the source.