Brazil's Cesar Cielo Filho poses with his gold medal at the men's 50m butterfly victory ceremony during the World Swimming Championships at the Sant Jordi arena in Barcelona, July 29, 2013. [Photo/Agencies]
Geng Jiasheng, 54, a national master technician in the manufacturing industry, is busy working on improvements for a new removable environmental protection toilet, a project he has been devoted to since last year.