Nicaragua’s proposed Grand Canal would be one of the world’s largest engineering projects. Its proponents say it could transform the country’s economy, while critics say it could be an environmental …

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

Tariffs have been applied over the years to protect homegrown industries and target competitors who are seen as using unfair trade practices. They impose costs on both importers and exporters and had been in decline until the recent U.S.-China trade war.