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One in three children in Peru was growing up too short for their age, stunted by a lack of the right foods in their diet. Then in 2005, the government put in place an innovative new system. They gave cash hand-outs to poor mothers but only on the condition that they had regular health check-ups and their children went to school. By 2014 the number of children growing up too small had halved. World Hacks tells the story. Also on the programme, should we start getting rid of paper money? Presented by Sahar Zand. Image caption: Mother and child part of the malnutrition programme / Image credit: BBC
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