Even before COVID-19, 90% of children in low-income countries could not read and understand a simple sentence. The global learning crisis is the biggest educational threat of our time, not just because it means that individual potential is being squandered. The world’s future hangs in the balance. After all, the children of today are the doctors and public health professionals of tomorrow. Since the COVID-19 pandemic, this sobering picture has only gotten worse. At its peak, COVID-19 pushed 1.6 billion...