One atomic bomb was used in a test explosion. Two more bombs were deployed over Japan. That left a mysterious fourth bomb—code-named Thin Man—in the U.S. nuclear arsenal.

WAR
Fears of nuclear war led to a fleeting craze for fallout shelters stocked with crackers, body bags, and guns.
Savage battles, atomic bombs, and shark attacks were just some of the events leading up to the end of World War II in August 1945. Here's a look back on its 80th anniversary.
From a dollhouse with a nuclear bunker to an atomic energy lab with real uranium, some of these toys from the ‘50s and ‘60s have us scratching our heads.
Kokura was the original target, but avoiding the atomic bomb may have been more than just random chance.
The nuclear anxiety of the 1950s led to two unlikely strategies: ducking under school desks and taking advice from a cartoon turtle.
After dropping the atomic bomb over Hiroshima on August 6, 1945, almost all of the 12 men aboard the ‘Enola Gay’ had something to say about it.
Eighty years after the first—and only—deployment of atomic bombs, here’s a look back at one of history’s most devastating acts of war.
Tens of thousands of fallout shelter signs, with three yellow triangles in a black circle, are visible on building façades today. They serve as grim reminders of the hottest flashes of the Cold War. So why are they still around?
Sometimes the military systems put in place to avert nuclear annihilation worked a little too well.
Some people made jokes; one person established the Nobel Prize.
While their images might not be immortalized on dollar bills or their stories ingrained into every high school syllabus, these lesser-known figures nonetheless played critical roles in the shaping of the American Revolution.
What you need to know about this so-called “Forgotten War” on its 75th anniversary.
The Arnold Schwarzenegger–starring Netflix series takes its title from World War II military slang. Here’s what 'fubar' means.
Discover the real reason why Memorial Day always happens on a Monday, plus how the holiday actually does differ from Veterans Day, and more.
From their birthplace in a tavern to the origins of that famous ‘Leatherneck’ nickname, learn more about the history of the U.S. Marine Corps.
Arlington is some of the most hallowed ground in the United States. But despite its great importance, the cemetery has had more than its share of scandals.
These tributes to fallen soldiers may not be as instantly recognizable as the Vietnam Memorial and others, but their stories are no less fascinating—including one that doubles as a mausoleum right in Manhattan.
In 1947, the seemingly everyday, innocent thoughts of a teen girl were published. But they weren’t so everyday: they were the thoughts of Anne Frank.
Three of the four acts expired shortly after they were signed into law in the late 1700s. One remains active—and it’s been at the center of constitutional debates ever since.
The best Vietnam War books from Tim O’Brien, Viet Thanh Nguyen, and others offer new insights and perspectives into the conflict that you probably never got from history class.
The number of living Vietnam Veterans is quickly dwindling. Now’s the time to show them you care.