A teacher and her students wash hands before the launching ceremony of a campaign in Nairobi, Kenya, Oct 15, 2012, the 5th annual Global Handwashing Day. The United Nations Millennium Villages Project launched a campaign on Monday to promote the very simple act of handwashing with soap in rural villages of Kenya, in an effort to reduce diarrhoeal related diseases among children. [Photo/Xinhua]

A student washes hands before the launching ceremony of a campaign in Nairobi, Kenya, Oct 15, 2012, the 5th annual Global Handwashing Day. The United Nations Millennium Villages Project launched a campaign on Monday to promote the very simple act of handwashing with soap in rural villages of Kenya, in an effort to reduce diarrhoeal related diseases among children. [Photo/Xinhua]