The world faces two problems in education, says Vikas Pota, chief executive of The Varkey GEMS Foundation. One is that there are many children, about 57 million, who are not at school. The bigger crisis, however, is the fact that there are hundreds of millions of children who are at school, but who aren’t learning anything. The Varkey GEMS Foundation conducted a global study to find out how to improve the quality of teachers in the classroom. Overall they found that solving the...