Yemen is suffering a major humanitarian crisis. How did the country get to such a precarious state, and why aren't Americans paying more attention?

With President Trump calling for a “Space Force” and private enterprise increasingly invested in space, what of the dream of international peace?

The U.S. and most other large militaries have been trying to develop laser weapons for decades. Has China created the first portable laser gun?

A prescribed period of civic service may offer benefits, promoting active citizenship across the socioeconomic divide and creating strong social ties.

During WWI, artist and British naval officer Norman Wilkinson came up with an idea so crazy it just may have worked: Dazzle Camouflage.

Barack Obama was awarded the Nobel Peace Prize in 2009. He took the award not as a reward for accomplishments but as a "call to action."

Iran's nuclear program is in the news, again. But what's the backstory on how the country went nuclear in the first place?

A multi-decade study of wildlife in Africa found that armed conflict—even infrequent, low-level conflict—was enough to cause declines in a wide range of wildlife populations.

Historically speaking, we are living in unusually peaceful times. But does peacetime mean bad things for the economy, which is often boosted by war?

Pessimism is on the rise. Mercurial politicians, rising nationalism and isolationism, international bluster, a changing climate, mass protests, ...