TWENTY student ambassadors of hygiene, winners of a public health education competition, flew to Singapore over the weekend for a free five-day visit, their prize in the competition. The ambassadors also had a mission - to learn about Singapore's public health services and facilities and to tell people they meet there about such facilities and services in Hong Kong. They will meet and talk to officials of Singapore's Ministry of Environment and visit the Newton Circus Food Centre and a public toilet to see how these are managed and maintained. The ambassadors will also visit a primary and a secondary school to exchange views with students on environmental and hygiene matters. The competition, which was organised by the Urban Council, required each team of contestants to submit a written project. It is hoped that by interesting students in the council's public health services and facilities, particularly their proper use, the students in turn will pass on such knowledge to their families and friends. The competition also encouraged contestants to suggest practical ways to improve and upgrade such facilities and services.