'Keep Calm and Carry On' was long-forgotten World War II propaganda

A popular tag in World War II announced 'Kilroy was here'

The graffito appeared seemingly everywhere throughout the 1940s and followed a similar pattern: A man with an oversized nose peering over a ledge, with the phrase written below it. Scholars believe it was an American form of similar tags that appeared in Australia and England, making "Kilroy" a meme long before the word had entered the lexicon.

Comic books were a major part of American propaganda efforts during WWII

See how US comic books, alongside international counterparts, served as powerful wartime propaganda tools from 1941 to 1945—boosting morale, promoting war bonds, and demonizing Axis powers through the use of iconic heroes and patriotic messaging.

Winston Churchill said he was comforted by 'Pride and Prejudice' during World War II

The prime minister was bedridden in a hospital with pneumonia in 1943. In his memoirs, Churchill recalls how Austen's "Pride and Prejudice" comforted him, especially because its characters remained calm amid the political turbulence of the time.

See how Britain promoted imperial trade through 1920s propaganda posters

This photo gallery showcases posters from the Empire Marketing Board, created after Canada gained dominion status in 1926. The campaign encouraged Canadians to buy goods from across the British Empire, producing more than 800 posters displayed nationwide.

The “Phoney War” was an eight‑month build-up to war

From September 1939 to May 1940, following their war declaration on Germany, Britain and France entered a phase of military inaction—even as civil defence measures, naval blockades, and rationing intensified at home. Skirmishes were limited, but the decisive fighting didn't begin until Germany invaded Norway and France in April–May 1940, abruptly ending the uneasy stalemate.

Churchill’s 1946 ‘Iron Curtain’ speech warned of growing Soviet domination

In a 1946 speech, Winston Churchill declared that an “Iron Curtain” had descended across Europe—dividing East from West. The address marked one of the first public acknowledgments of the emerging Cold War and coined the term that would define the conflict.

Nazi Germany replaced Advent calendars with depictions of family life under Nazi rule

During World War II, the Nazi regime banned printed Advent calendars because of religious messaging. Officials instead produced state-approved versions featuring swastikas, tanks, and Nazi symbols.

Norman Rockwell's 'Freedom of Speech' has become an internet meme

The famous painting, which portrays a man in work clothes speaking up in a crowd of men in suits, has become a companion image for internet users posting unpopular or controversial opinions. (Some users may experience a paywall.)

A history of "Memento Mori," from the ancients to today

The ancient Latin phrase 'memento mori' means 'remember you will die.' The counterintuitive utterance has long provided a moral and spiritual framework for individuals to evaluate their life's decisions and worldview. Though it appears morbid at first glance, the saying is meant to inspire a thirst for life. Review the various ways the idea has inspired different cultures in this article, from the Romans and Egyptians to contemporary tech leaders like Steve Jobs.

During the COVID-19 pandemic, readers returned to Camus' 'The Plague'

The 1947 novel, about a city in Algeria that enacts a city-wide quarantine to battle a deadly outbreak, captured readers' attention in the early months of 2020. In the UK, over 2,000 copies of the book were sold in March of that year, over six times what it had sold the month before.

The ubiquitous 1990s “Got Milk?” ad campaign was intended to fix milk’s dwindling popularity in the late 20th century

Despite its success in spreading the word about milk, the sales numbers weren’t quite as impressive. This Mental Floss article details the marketing efforts themselves, as well as how milk lobbyists didn’t necessarily succeed despite their revolutionary ads.

A global interactive guide to the first world war

Using rarely seen films, new reports of the day, and interactive maps, 10 historians provide a summarized history of the Great War, World War I. During the course of this half hour film, get a variety of insights and perspectives on the so-called "war to end war" and its long-reaching effects.

'No army can withstand the strength of an idea whose time has come.'

-Author Victor Hugo (1802-1885)

See this collection of mental health cartoons

These cartoons were curated around mental health themes in celebration of World Mental Health Day, which is observed annually on Oct. 10. The 15+ cartoons include thematic nods to weathering mental health challenges and looking forward to better times ahead.

FDR stayed composed as he absorbed the news of Pearl Harbor

This video reconstructs Roosevelt’s steady, methodical response on Dec. 7, 1941, from his first briefing to drafting his speech to Congress. It demonstrates how FDR maintained composure and moved rapidly to prepare the nation for war.

'Dr. Strangelove' is widely considered the best satirical film

Stanley Kubrick’s satire about nuclear war came just two years after the Cuban Missile Crisis and spoke to Americans still coming to terms with the possibility of nuclear annihilation. In 1989, the Library of Congress included it among the first 25 films preserved in the National Film Registry, a repository for the greatest achievements in cinema.

Time magazine ran a cover story titled 'The End of the World as We Know it?' in January 1999

In January 1999, Time published a dramatic Y2K cover with apocalyptic imagery and dire headlines. The portrayal likely exacerbated public fear and magnified the crisis in the popular imagination, turning a technical issue into a cultural panic.

Clue, the murder-mystery board game, was designed during World War II air raids.

Who were the Cambridge Five

Recruited in the 1930s, the Cambridge Five infiltrated British intelligence and leaked secrets to the Soviets for decades, shaping WWII and the Cold War.

Browse a fan-made 'Newspeak Dictionary'

In Orwell's "1984," citizens of Oceania are expected to use Newspeak, a form of English that limits abstract thought and reinforces the government's version of reality. This satirical dictionary of the language demonstrates how Orwell constructed a lexicon for his fictional world.

Deadliest maritime disaster

In the final months of World War II, 75 years ago, German citizens and soldiers fleeing the Soviet army died when the “Wilhelm Gustloff” sank

10 items that could have saved your life in the trenches

Soldiers settled into trenches to defend themselves against shrapnel and bullets, but weapons such as mustard gas crawled along the ground and settled in these low-lying areas. Here are 10 items that could have helped you survive the trenches, according to this article.

During World War II, turbulence was used to make ice cream

Before a mission, bomber crews packed buckets of ice cream mix into the rear gunner's compartment. Once airborne, freezing air solidified it, and turbulence churned it smooth, so that pilots had a fresh ice cream after landing.

The origins of the Guinness Book of World Records

Yes, it was the beer company that started it. In 1955, the very first edition of the Guinness Book of World Records debuted as a marketing campaign for the famous Irish beer brand. Get all the details on the origins here.

'Under God' was added to the pledge in 1954 as an anti-communist statement

When President Eisenhower signed the phrase into law on Flag Day 1954, the intent was ideological: to distinguish American democracy from "godless" Soviet communism. The author of the original 1892 pledge, Francis Bellamy, was himself a Baptist minister who believed in the separation of church and state, making the addition an inversion of his intent.

See the most iconic photos from four decades of LIFE magazine

Mid-century modern graphic designers, known for their bright colors and bold lines in advertising, also found success with children's books.

In 1915, workers recovered a submarine-like vessel from the Chicago River, prompting fears of German espionage

The identity of the Tank Man in the iconic photo from the 1989 Tiananmen Square protests remains unknown and was possibly killed.

In 1939, baseball star Lou Gehrig delivered his inspirational 'Luckiest Man' speech after retiring due to the health condition that now bears his name.

A 2019 Facebook event called on attendees to "Storm Area 51, They Can't Stop All of Us," resulting in countless memes, the creation of a music festival, and eventually the arrests of those who did try to approach the area.

In 1945, Surrealist artist Salvador Dalí and legendary animator Walt Disney began collaborating on a short film that was not completed until 2003, years after both men had died.

The original copy of the Declaration of Independence is not a pristine document, and even features a smudged anonymous handprint in the bottom left corner.

Against his wishes, Albert Einstein's brain was removed before his cremation, and the pathologist responsible stored it for decades in mason jars within a beer cooler.

Clever Hans was a 1900s horse that was believed to be able to solve math equations, tell time, and read and comprehend German, until a psychology student discovered how he got his answers.

Famed poet TS Eliot rejected the manuscript for George Orwell's political fable 'Animal Farm,' writing that its criticism of authoritarianism was not 'the right point of view.'

Explore fun facts from the USPS, including unique post office buildings, a stamp that traveled past Pluto, and more.

Some researchers have labeled nomophobia, the fear of being without your phone, as 'the phobia of the 21st century.'

The Beatles' US label rejected the band's first two singles, 'Please Please Me' and 'From Me to You,' with one executive calling the band 'dead in the water.'

After the Boston Tea Party, colonists switched to coffee, which became the main morning drink for revolutionaries.

American dance legend Martha Graham, sometimes called 'the Picasso of dance,' refused to perform at the 1936 Olympics in Berlin and conceived the piece 'Chronicle' in response to the experience.

Double world record holder Hunter Ewen helped conquer his fear of balloons, called globophobia, by training to win Guinness World Record titles for balloon inflation.

A small portion of The Winstons' 'Amen, Brother,' an obscure '60s gospel record, is the basis for thousands of hip-hop tracks, making it one of the most sampled records ever that's informally known as 'the Amen break.'

The most expensive ad of all time was for Chanel No. 5 perfume and cost roughly $33M to produce in 2004—about $57M in today's dollars.

Elk Cloner, the first computer virus to spread in public, was written as a practical joke by Richard Skrenta, a Pittsburgh high school student.

Memecoins are a type of cryptocurrency—a form of digital currency with a wide variety of uses—created around popular 'memes,' or viral internet jokes.

'Shogun,' a 1980s TV series, helped popularize sushi in the US by stimulating an American interest in Japanese culture.

Sunflowers have long been a symbol of nuclear disarmament because they can extract large amounts of radioactive cesium from soil.

Chaos theory—informally known as the butterfly effect—is the reason why weather forecasts are presented with probabilities rather than certainties.

'Silent' fireworks have gained more interest in recent years as a quieter celebratory option.