Recent killings by U.S. officers have sparked widespread calls for police reform and an end to systemic racism. Here’s how U.S. policing compares with other countries’ approaches.

Charges of foreign power interference in the U.S. presidential election have raised grave national security concerns and touched off multiple federal inquiries that could drag on for months.

Hydraulic fracturing has unlocked huge reserves of shale gas and oil, transforming the energy outlook in the United States and the world, even as local opposition and falling world prices threaten th…