A joke about mercury in an elevator led to the invention of emoticons

Where did emoticons come from?

Carnegie Mellon professor Scott E. Fahlman says he's one of the original creators of emoticons. In the 1980s, the Carnegie Mellon computer science community was already making heavy use of online bulletin boards, and users began to run into issues of attempted humor not coming across through virtual text. The solution? Using "joke markers" to denote non-serious posts, which prompted Fahlman to propose :-) and its inverse :-(.

Memes can be traced back to the chain letter

Such intentional reshaping of communication transmissions dates back at least hundreds of years to the advent of the chain letter, a type of message that asks readers to create their own copy or at least forward it to others.

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.

The story behind one iconic meme

The 2012 post titled "Just a book owners smile" shows 11-year-old Maggie Goldenberger—resplendent in her braces, pigtails, and treasure map-like vest—holding a trio of Goosebumps books and grinning wildly at the camera. Another user quickly captioned it, "GERSBERMS. MAH FRAVRIT BERKS."

Internet sleuths solve secret message on Perseverance rover’s Mars parachute

In 2020, the Perseverance Rover landed on Mars, sending a message for the folks back home on its parachute. It took fewer than six hours for the Internet's collective forces to decode the secret slogan hidden in the parachute's colors and patterns, as well as the geographic coordinates of the earth-bound place where rocketry was perfected.

Why some people say the moon is made of cheese

Mental Floss digs into the history behind the fable, which dates back as far as the 1500s, when it was mentioned in "The Proverbs of John Heywood." Even NASA has gotten in on the joke, tweeting a (supposedly) doctored photograph showing the moon's expiration date.

Teaching a robot to laugh

Researchers have designed a shared-laughter AI system that responds to human laughter in order to build a sense of empathy into dialogue. Learn how they did it with this explainer.

The invention of the barometer proved that air has weight

The instrument measures air pressure by creating a partial vacuum—a region with very low density—which serves as the basis for how suction works. Mercury-based barometers were used until 2007, when they were restricted due to mercury's toxicity.

The terms 'bug' and 'debugging' were popularized by Grace Hopper's team

Engineers working on the Mark II computer at Harvard University identified a moth in one of its components in 1947, which caused it to malfunction. Describing the incident as the "first actual case of bug being found," the term first used by Thomas Edison in 1878 to describe faults in an apparatus caught on.

The Melissa 'virus' helped associate pornographic sites with computer viruses

A worm-embedded document posted online enticed users to download and open it by alleging to contain passwords to paywalled explicit websites. Upon opening, the worm shared itself with 50 addresses in a user's Outlook contacts, masquerading as a friendly attachment. Its rapid spread overwhelmed email servers and caused $1.1B in damage worldwide.

The Ig Nobel Prizes honor scientific achievements that make people laugh, then think

These prizes show that even seemingly trivial work can gain attention, build momentum, and connect with broader audiences when presented engagingly. Winners include creating a toilet that analyzes your poop and understanding why scientists lick rocks.

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

Watch how the Enigma machine encrypts messages and learn about its critical design flaw

Using settings selected from a series of rotors and a plugboard that let operators swap letters with any of their choosing, the machine lit up the output letter for each letter typed. While this system could generate messages requiring any of 150 quintillion potential keys, the machine's reflector never encrypted a letter as itself, providing an entry point for exploiting the system.

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.

The work of Claude Shannon, for whom Anthropic's AI chatbot is named

Known as the father of information theory, Claude Shannon applied Boolean algebra—a subset of mathematics that quantifies true or false statements as 1 or 0, respectively—to circuit design to develop the concept of a binary digit. His paper "A Mathematical Theory of Communication" (1948) laid the groundwork for all modern digital systems.

In 2025, Apple devices couldn't send audio messages with the phrase 'Dave & Buster's'

The transcription engine in iOS 18, which converts speech to text in the Messages app, had been incorrectly processing phrases with the ampersand ("&") symbol. The error was corrected via a bug fix after extensive user error reports.

A history of manicules, or the little hands in books and posters

Manicules are illustrated hands used in many contexts to point something out, whether by medieval readers to highlight passages or in 19th-century advertising. The hands have a quirky, persistent history, showing up over hundreds of years in everything from Petrarch's books to computer cursors and the US Postal Service's "Return to Sender" stamp.

Ancient Romans sometimes lobbed insults through graffiti

Graffiti was used to communicate ideas, offer advice, and, not unlike the internet, talk some trash. That was especially true with tourists, who sometimes scrawled messages on the pyramids, including one person who complained, "I can not read the hierogylphics." In response, someone replied, "Why do you care that you can not read the hieroglyphics? I do not understand your concern."

The hormone that spreads love and helps fish share fear

Scientists consider emotions like fear and empathy to be among the oldest evolutionary behaviors observed in mammals. Yet to date, how these reactions are processed in the brain, regardless of species, is not well understood. A new study reveals how the chemical oxytocin—known as the "love hormone" in humans—helps let fish know when their friends are in danger.

Executives at American Online wanted to shut down AIM

Despite not seeing value in a service that could not be charged for, executives were pushed by the development team behind AOL's Instant Messenger to keep it free, which helped it reach 36 million active users. Screenname selection and away messages allowed users to express their individuality, and the use of emoticons sets the tone for future internet communication.

Thomas Edison, eager to communicate with ghosts, tinkered with an apparatus called the 'spirit phone'

The inventor was interested in developing a scientific method for communicating with the dead. He was not interested, though, in the occult figures who believed the dead could be reached through Spiritualism, which he found childish. He believed those kinds of people "permit themselves to become, in a sense, hypnotized into thinking that their imaginings are actualities."

The sophisticated math jokes of 'The Simpsons'

"The Simpsons" has always been a slyly sophisticated show and has featured more than a few references to complex mathematical concepts. That's largely due to its writers' room, which has featured more than one writer who studied math before transitioning to comedy.

Photons are both particles of light and messengers of the electromagnetic force

Einstein's model of light as a wave and a massless particle of energy revolutionized physics, and scientists' application of the model led to groundbreaking technologies, including medical imaging and treatments, telecommunication signals, and probes of the quantum and cosmological realms.

Radioactive elements can introduce software errors because the ionizing radiation they produce can detach electrons from atoms, and computer code relies on the distribution of electrons.

An 1844 chess match via telegraph anticipated the game's online popularity

The late November match pitted two local rival chess clubs from Baltimore and Washington, DC, against each other. The moves were transmitted over the Baltimore-Washington telegraph line, which had just been installed the previous May.

The Tony statue features tragedy and comedy masks

The twin masks, one smiling and one frowning, represent the dual worlds of comedic and dramatic theatrical productions. Their roots go all the way back to ancient Greece, where they were used to cue the audience in on character emotions, no matter how far back from the stage they were seated (and to hide the real faces of men playing female characters).

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.

Harvard and MIT researchers are developing life-saving tattoos

Tattoos aren’t just a fashion statement. Scientists are trying to find life-saving applications for them. Harvard and MIT researchers are developing tattoo inks that react to body chemicals, alerting diabetics to blood sugar fluctuations or athletes to dehydration. Someday, patients may observe their body chemistry with tattoos that change colors.

The word 'jazz' evolved from 'jasm,' 19th-century American slang for 'energy'

Radioactive elements can introduce software errors because the ionizing radiation they produce can detach electrons from atoms, and computer code relies on the distribution of electrons.

Learn more about the history of fireworks, which dates back to an accidental invention during an alchemist's quest for information about immortality.

This site reaches millions of visitors who are tired of AI chatbots and seeking human connection. Pretend to be an AI chatbot and ask questions, provide answers, and draw for people in real time.

English mathematician Ada Lovelace wrote the first computer algorithm a century before computers existed and hypothesized that computing devices would one day be able to compose music—foreseeing the generative AI systems of today.

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

Planeterrellas create artificial auroras that mimic the atmospheric displays of light by setting up an electric field between two metal balls in a jar filled with a small amount of air.

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

At the beginning of the 20th century, a group of young men ate standard American food—replete with food additives like borax and formaldehyde—as part of government research to better understand food safety.

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

See these 16 pieces of art evoking phobias of snakes, flying, spiders, and more. 

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.

Dorothy's famous entrance into Oz in 'The Wizard of Oz' relied on analog tricks, including a body double and sepia-toned paint, as much as it did on technology

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

The first image of a black hole was captured by creating an Earth-sized virtual observatory from a network of eight radio telescopes.

The animatronic shark from Steven Spielberg's 'Jaws,' the first modern blockbuster, was a complex underwater apparatus called 'Bruce.'

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

In 2009, the nation was gripped by the story of a missing young boy who was believed to be floating over Colorado in a homemade balloon, until it was revealed that he was at home the whole time.

While the sun's gravity keeps the planets in orbit, their gravity also pulls on the sun, causing it and everything else in the solar system to orbit around a mutual balance point called the barycenter—the true center of the solar system.

Human-to-human transmission of hantavirus remains extremely rare, so the 2026 hantavirus cruise ship outbreak doesn't mean we're facing a COVID-style pandemic risk.

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.

The hormonal disorder PCOS was renamed PMOS in 2026, a move designed to improve care and research by shifting the focus to the hormonal causes of this condition that affects 1 in 8 women.