Nguyen Tuan Bao and his wife Khanh have lived in the same building for 40 years. Their eldest son lives above them and their youngest in the ground floor apartment. Nguyen Tuan Bao, who works as a tourist guide, is especially proud of the time he spent studying in the former East Germany. For more go to http://www.dw.de/program/global-3000/s-11487-9798