Chinese artist Ai Weiwei poses for a portrait in Beijing

Ai Weiwei, 53, one of China's most prominent avant-garde artists and human rights activists, poses for a portrait in his Beijing studio on April 25, 2009. U.S. Secretary of State Hillary Clinton urged China to free dozens of government critics rounded up this year including Ai Weiwei and said Beijing's human rights record was worsening. UPI/Stephen Shaver