Machine learning algorithm uses mobile phone records to tell whether you can read or write

One of the millennium development goals of the United Nations is to eradicate extreme poverty by 2030. That's a complex task, since poverty has many contributing factors. But one of the more significant is the 750 million people around the world who are unable to read and write, two-thirds of which are women. There are plenty of organizations that can help, provided they know where to place their resources. So identifying areas where literacy rates are low is an important challenge.