SEOUL, SOUTH KOREA - NOVEMBER 22: South Korean students hold up oriments made with colored mud, at the 'Toilet and Bath Expo' on the sidelines of the Inaugural General Assembly of the World Toilet Association on November 22, 2007 in Seoul, South Korea. The World Toilet Association opened the Expo to impove peoples awareness of hygiene and sanitation. (Photo by Chung Sung-Jun/Getty Images)
