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, ...

Images of children in wartime, like those from Aleppo, can shock the world. But what happens after that isn't so clear.

War happens when words no longer work. Yet war is declared at the very point when words are at their most powerful. Chi Luu examines language loss in war.

John Houston takes a less melodic look at the transformation of the Battle of Waterloo from "fact to myth," from history to literature.

The last time Congress formally declared war was in World War II.