130 million girls didn’t go to school today— not because they didn’t want to, but because they weren’t given the chance. There are dire consequences to not educating girls. In many countries, girls out of school will be more likely to become child brides, more vulnerable to diseases like HIV, and more likely to die young. For example, if current trends in education continue, by 2050, this is the future we’re looking at: Low-income countries alone will lose $1.8 trillion;...