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.

The Zika virus, which has been found to cause severe birth defects, has spread across the Americas, prompting the World Health Organization to declare a global health emergency.

World powers continue to punish North Korea with economic sanctions, but the pressure has so far failed to push Pyongyang toward denuclearization.

Here’s how different health-care systems, including single-payer and government-run, have contended with the coronavirus.

The People’s Liberation Army is aiming to become the dominant force in the Asia-Pacific, strengthening China’s hand toward Taiwan and international disputes in the South China Sea.