Nigeria, June 3 -- There are the golden investments whose returns cannot be measured merely in currency or economic indices, because their benefits ripple through generations and quietly shape the destiny of nations. The education of the girl child belongs to that rare category. Whenever a girl is led into a classroom and entrusted with knowledge, a future is strengthened, a family is elevated, and a nation is enriched. Yet across many parts of the world, and particularly in developing countries, millions of girls continue to be denied this fundamental opportunity. According to UNESCO, more than 120 million girls worldwide remain out-of-school, while countless others face the constant threat of dropping out because of poverty, insecurity...