The dollar’s role as the primary reserve currency for the global economy allows the United States to borrow money more easily and impose painful financial sanctions. Other countries are beginning to …

The world is inching closer to eradicating polio, but armed conflicts and opposition to vaccines stand in the way of finally eliminating the disease.

The swift development of effective vaccines against COVID-19 was an unprecedented scientific achievement. But production challenges, vaccine nationalism, and new variants have all presented hurdles.