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Image caption Menpaw Mro lost his daughter to malaria. A ground-breaking study in Bangladesh has found that using data from mobile phone networks to track the movement of people across the country can help predict where outbreaks of diseases such as malaria are likely to occur, enabling health authorities to take preventative measures. Every year, malaria kills more than 400,000 people globally - most of them children. Menpaw Mro lifted his young daughter on to his shoulders and began the long journey to the nearest hospital, in the Chittagong Hill Tracts, first on foot, then by boat and finally in a small motorised rickshaw. Time was desperately short. For several days, he had assumed the... Full story

11 June