Mariana Cook’s book , “Faces of Science,” portrays 77 scientists who have made many of the most important discoveries of our time. Each photograph is accompanied by a personal essay written by the scientists. The portraits in this online series are accompanied by excerpts from those essays. For more information, please visit Mariana Cook’s website: www.cookstudio.com .
Shakespeare likened life to a play of seven acts, of which the seventh and final act
 Is second childishness and mere oblivion; 
 Sans teeth, sans eyes, sans taste, sans everything. 
I am, fortunately, with teeth, with eyes, with taste, with almost everything, and I have been given the chance to help Tsinghua University to build a research center. Tsinghua University campus is where I had grown up. My life has gone full circle:
 In my beginning is my end, 
 ………………………………….. 
 In my end is my beginning.