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From left, Thomas Mwanza, 14, Kuwala Mwango, 12, Sandra Tembo, 14 and Anna Simasiku, 13, carry 20-liter containers of water more than five kilometers to draw water in rural Zambia. They say they sometimes miss school because they must fetch water for their families. More than a third of all Zambians do not have easy access to clean water, according to UNICEF, the U.N.’s child advocacy agency. The stream nearest the village where these children live is contaminated because it is used by animals, Thomas says.