According to the BBC, health authorities in Bangladesh have found that they can use mobile phone data to stop the spread of malaria. 

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