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.

U.S. space exploration inspired a generation of students and innovators, but NASA’s role has diminished, and the number of global space competitors is growing.

Foreign policy issues regularly come to the fore at the national political conventions, especially during periods of global instability. Sometimes the events are marked by bitter disagreements within…