Xiaomi's Barra quits China for Silicon Valley

Hugo Barra, who caused a sensation in 2013 by leaving Google to become a vice president of Chinese smartphone maker Xiaomi, announced Monday he was returning to the United States for health reasons. Barra, under whom Xiaomi was for a time China's best-selling brand, described his experience as a "spectacular" journey but said it was time to return home for a "new adventure". Beijing and other Chinese cities are notorious for dangerous air pollution.