Crowds used a thumb gesture to decide whether a gladiator lived or died

Roman gladiator referees wore tunics and carried switches

Drawing on visual and textual evidence, a Roman social historian shows that referees were a constant presence in gladiatorial combat. Rather than armor, they wore striped tunics and used long switches to signal fouls and control fights from a safe distance.

The standing ovation comes from an ancient Roman military tradition

Ovation is derived from the Latin for “I rejoice” and was a ceremonial salute to military generals who'd been victorious in battle.

A Roman-era cemetery in York may hold the remains of gladiators

A burial ground in York, used from the 1st to the 4th centuries CE, contained around 80 skeletons of unusually tall and muscular young men. Many show fatal combat wounds, including one with a bite mark from a large predator.

Measuring the chance a Roman emperor would die violently

The odds of survival for a Roman emperor were like playing Russian roulette with a six-chambered revolver and four bullets, according to this scientific journal article. Of the 69 rulers of the unified Roman Empire between 14 CE and 395 CE, 43 suffered a violent death. This journal article examines Roman emperors' time-to-violent death using statistical tools of survival data analysis.

Human sacrifice reinforced Aztec political control and religious belief

The Aztecs controlled a vast territory through military might and intimidation. One very key tactic of control was the ritual of human sacrifice. While an effective scare tactic, the ritual was also grounded in deeply held beliefs that the world was sustained by blood.

The art of classical rhetoric

Ancient orators snapped human communication in two: the open palm of persuasive rhetoric versus the closed fist of evidence-heavy dialectic. The former seeks to convince the many via one's speech, while the latter seeks the truth in an argument. In ancient Rome, rhetoric had five "canons": invention, arrangement, style, memorization, and delivery. Loading the rhetorical canons in order was meant to help orators craft an effective and impactful speech.

The poet Martial vividly described the Colosseum’s opening games

In "Liber Spectaculorum," Martial recounts the inaugural spectacles at the Colosseum, offering graphic depictions of staged executions—some modeled on Greek myths—that took place during the midday program.

Spartacus led a 70,000-strong slave army that defeated Roman forces

After escaping a gladiator school in Capua, Spartacus led the largest slave revolt in Roman history, routing Roman armies before being crushed by forces under the command of Crassus and Pompey. Later generations recast him as a symbol of resistance.

Discover the deep history of Indigenous Hand Talk

This video explores Plains Indian Sign Language, part of a broader system known as Hand Talk that dates back centuries. It traces regional variations across North America—and how residential schools worked to suppress its use.

See haunting images of the plaster casts of Pompeii’s victims

The plaster casts preserve victims’ final moments in striking detail—from their poses to the expressions frozen on their faces. This piece explains how 19th-century archaeologist Giuseppe Fiorelli devised the method long after the bodies had decomposed.

Explore jury nullification, the little-known power that lets jurors ignore the law and acquit anyway

When jurors disagree with a law, they can simply vote to acquit regardless of the evidence; however, this practice is rare, and the legal system actively discourages it. This podcast traces its history from a Quaker prayer meeting in London to the LA riots.

'Tattoo' comes from a Polynesian word that means 'to strike'

“Tatatau” roughly translates to “strike,” a reference to the ancient process, which involved tapping ink into the skin with sharpened objects, like the bronze implements used circa 1450 BCE in Egypt, below.

Prediction markets have their own lingo that's an amalgamation of Gen Z and Gen Alpha slang

For instance, if you've been out-maneuvered by another trader, you've been "mogged." A "rulescuck" is someone who is a stickler for betting market rules and may try to win on a technicality.

The Gold Dust Trio brought spectacle to wrestling

In the early 1900s, as wrestling gained in popularity on the carnival circuit, keeping the audience’s attention became an issue. The Gold Dust Trio—Billy Sandlow, Ed “The Strangler” Lewis, and Joseph “Toots” Mondt—revolutionized things by integrating boxing, theater, and Greco-Roman wrestling in a hybrid called “Slam Bang Western Style Wrestling.”

Graffiti dates back to at least ancient Pompeii, where citizens scrawled messages to one another on public walls

'Donation after circulatory death' is on the rise

This occurs when a patient in a coma is on life support and family members agree to donate the organs. Watch this video about a 2025 New York Times investigation that identified 12 instances across nine states of bungled or premature attempts to retrieve organs from people whose families had authorized withdrawal of life support.

How Americans have voted throughout history

From shouting candidates’ names, to hanging chads to electronic scanning, the nature of voting has a long, sometimes bumpy history in the United States. See descriptions and images in chronological order with this digestible timeline.

Why cartoons only have four fingers

Ever notice cartoon characters only have four fingers? There’s a surprising reason why and it goes back to the first Mickey Mouse cartoons. From saving money to cultural taboos, here’s why animators draw hands this way.

The evolution of the em dash, a now-controversial piece of punctuation

The curious form of punctuation was originally used to replicate humans' naturally broken—and sometimes scattered—way of speaking, with Shakespeare often using it in his plays and Emily Dickinson deploying it for numerous effects. But as large language models like ChatGPT began using the em dash, real humans began viewing it as a tell of non-human writing. This podcast episode dives into the strange turn of events.

Maradona's controversial "Hand of God" goal against England

The illegal handball occurred during the 1986 FIFA World Cup and went unseen by the referees. Because the refs didn't observe it and couldn't access the replays at that time, the handball was allowed to stand. When Maradona was later asked whether he handled the ball illegally, he replied it was "a little with the head of Maradona and a little with the hand of God," giving the play its name.

Authoritarian regimes sometimes used film dubbing to censor ideas

Dubbing rose in popularity in the early 20th century because of relatively low literacy rates, which made subtitles impractical. Totalitarian regimes—including Mussolini's Italy, Franco's Spain, and Hitler's Germany—used dubbing to remove or alter unflattering or countercultural dialogue.

All the ways colonists protested the absurd breadth of the Stamp Act

Philadelphia publisher William Bradford replaced his paper's required revenue stamp with a skull and crossbones. It read: "O! the fatal Stamp," and staged elaborate mock funerals for liberty, a comic protest trend that spread across the colonies until the act's repeal in 1766.

The devil went down to Georgia

For years, a mysterious figure preyed on gay men in Atlanta. People on the streets called him the Handcuff Man, but the police knew his real name. It wasn't until a dogged local news reporter interviewed the underground community of male sex workers that local officials were prompted to intervene in the killer's reign of terror.

Revolutionary leader Che Guevara has a complicated historical legacy

Revolutionary icon or ruthless enforcer? This animated courtroom-style video weighs Che Guevara’s life and actions—tracing his rise alongside Castro, his role in revolutionary violence, and his global symbolism—before leaving viewers to render their own verdict.

In medieval France, pigs were once put on trial

Pigs are omnivorous animals. There are hundreds of records of pigs killing and eating children in medieval Europe. In France, these tragedies often resulted in trials and then hangings. Some pigs were held in jail for years before being executed.

In 1914, the Financial Times asked readers to redraw Europe for cash prizes

Two months in World War I, the newspaper invited readers to sketch postwar borders and submit peace terms for cash prizes. The contest captured public attempts to predict a new world order and foreshadowed modern crowdsourced forecasting. It's a wild look at how uncertain Europe's future was at the time.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

The concept of phantom limbs, the perception that amputated limbs are still present, dates back to a French military surgeon in the 16th century.

Exploring the Larry Bird punch that almost changed March Madness

See images of medical cases of firework injuries shared on this 'Instagram for doctors.' (Warning: Graphic content)

The tragic Pulitzer Prize-winning image 'The Vulture and the Little Girl' (1993) generated controversy, raised concerns about ethics in photography, and eventually led to the photographer's death.

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.

Tattoos remain visible on your skin thanks to immune cells called macrophages

Visualize how CRISPR-Cas9—a type of immune system used by single-celled organisms to attack invasive viruses—targets and makes precise changes to a gene's DNA.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Watch the cumbersome, but necessary, precautions healthcare workers must take to care for and protect themselves while caring for Ebola patients.

A pickleball's loud 'pop' sound can reach 120 decibels, which is equivalent to a hammer hitting a nail

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

The distributor behind 'Rocky Horror' pulled the film from its scheduled national release, believing it would be a failure, though it eventually amassed a dedicated fanbase through midnight showings, a trend that continues over 50 years later.

Massive blooms of microscopic plankton called dinoflagellates produce the neon blue light seen in glowing tides.

A researcher recently discovered an interview from 1967 between groundbreaking journalist Joan Didion and the Grateful Dead, years before the band became an institution.

Fear or disgust related to clusters of holes and cracks, called trypophobia, may stem from evolutionary processes to help us avoid pathogens.

Fast-casual restaurant Chili's is experiencing a resurgence, with its parent company recently reporting a nearly 32% increase in sales, thanks to passionate Gen Z fans on TikTok.

Watch this video that uses Lego bricks to explain how venture capital works.

Explore chaos in this simulation of two double pendulums, where small differences in the release angles produce wildly different outcomes.

Volcanoes 'die' when their supply of magma runs out, if they are shifted away from their underlying magma reservoir, or if they get clogged by collapsing or their magma cooling back into rock.

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.

During the French Revolution, a botanist's letter asking about "dear Rhus" (poison ivy) was intercepted, leading authorities to suspect he was conspiring with the Russians.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement