Robin Li, founder and chief executive of Chinese search engine Baidu, listens as Bill Gates (not pictured), Microsoft Corp co-founder and co-chair of the Bill and Melinda Gates Foundation, speaks during a media conference in Beijing June 11, 2011. Gates and Li signed an agreement to form an alliance between their charitable foundations called the "Alliance for Healthy China". [Photo/Agencies]

Bill Gates, Microsoft Corp co-founder and co-chair of the Bill and Melinda Gates Foundation, smiles after putting on a shirt bearing the slogan: "Say No to Involuntary Smoking", during a media conference in Beijing June 11, 2011. Gates and Robin Li, founder and chief executive of Chinese search engine Baidu, signed an agreement to form an alliance between their charitable foundations called the "Alliance for Healthy China". [Photo/Agencies]