In this Jan. 28, 2013 photo, Chinese-born U.S. scientist Hu Zhicheng walks along the waterfront promenade of the Huangpu River in Shanghai, China. In
In this Jan. 28, 2013 photo, Chinese-born U.S. scientist Hu Zhicheng walks along the waterfront promenade of the Huangpu River in Shanghai, China. In Shanghai, he lives life as a free man, able to do anything except depart the country. Six thousand miles away in California, his family remains locked in their own emotional prisons: The wife who was left to raise two children alone. The son, just 13 when this started, who speaks bitterly of missing out on father-son moments. ((AP Photo/Eugene Hoshiko))