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http://www.pbs.org/wgbh/pages/frontline/ai-wei-wei/ He's a global art star who's using his renown, along with a video camera and Twitter following, to push the boundaries of freedom in China. Watch "Who's Afraid of Ai Weiwei?" on PBS March 29 at 9pm ET (check local listings). An intimate portrait of a man who's sometimes called China's Andy Warhol—Ai Weiwei. The second of three stories in this special newsmagazine hour of FRONTLINE.

Ai, Weiwei, China, Beijing, PBS, Documentary.