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Dogs are man’s best friend, and the canine ability to understand human words has gone a long way to solidify that world-changing relationship. According to the American Psychological Association, the average dog can understand 165 words, and “super dogs” — those in the top 20% of canine intellect — can understand around 250 words. Dog intelligence can be divided into three main types: instinctive (what the dog is bred to do), adaptive (what a dog learns from its environment), and working/obedience (what a dog is trained to do). Research into the levels of working/obedience intelligence in various dog breeds shows that border collies displayed the highest levels, followed by poodles, German shepherds, and golden retrievers. With the ability to also understand simple math (1+1 = 2, for example), these “super dogs” have an estimated cognitive ability equivalent to that of 2- to 2.5-year-old humans.

Dogs see in black and white.

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Recent research shows that dogs can make out yellows, blues, and hues in between. A dog’s retina has more rods than cones (humans are the opposite), and has only two types of cones. This makes dogs dichromatic, whereas humans, who have three types of cones, are trichromatic.

Although an understanding of 250 words is impressive, it’s by no means the absolute limit. The Einstein of the dog world is a border collie named Chaser. According to the journal Behavioural Processes, Chaser had the ability to recall and correctly identify 1,022 words. This far exceeds the vocabulary of any known dog, and pushes Chaser into the cognitive ability range of a 3-year-old. Now, that’s an extremely good girl.

Numbers Don't Lie

Numbers Don't Lie

Number of dog breeds recognized by the American Kennel Club as of 2025
200
Estimated maximum number of words cats understand
40
Estimated number of dogs in the world at any given time
900 million
Years ago when dogs were first domesticated in Siberia
23,000

The ______ was the most popular dog breed in the U.S. for 31 years.

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The Labrador retriever was the most popular dog breed in the U.S. for 31 years.

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Humans and wild apes may share a common, nonverbal language.

Not all language is verbal, and scientists theorize that human language actually evolved from a gesture-based language in our species’ distant past. A study published in the journal PLOS Biology in 2023 analyzed the gesture-based language of chimpanzees and bonobos, the closest living relatives to humans. In the study, thousands of humans (5,656 to be precise) watched videos of chimpanzees and bonobos striking different poses, and were often able to correctly guess the pose’s meaning. (The meanings had been predetermined by researchers based on work with the apes.) Participants were correct slightly more than 50% of the time in a series of four-answer multiple-choice questions. The results suggest that humans retain an innate ability to understand at least some of the language of great apes, which includes call signals that may be precursors to our own language.

Darren Orf
Writer

Darren Orf lives in Portland, has a cat, and writes about all things science and climate. You can find his previous work at Popular Mechanics, Inverse, Gizmodo, and Paste, among others.

Original photo by Hoptocopter/ iStock

The United States and its currency seem inseparably linked, but for much of the country’s history, an official, standardized U.S. dollar didn’t exist. In its place was a Wild West of currencies from competing banks located across several states. In their zeal to earn goodwill and customers, a few of these institutions even minted some rather creative banknotes. Instead of the chiseled visage of General Washington or other real-life American leaders, these notes featured the pudgy, bearded face of St. Nick, among other figures.

Franklin D. Roosevelt appeared on the $10,000 bill, the largest U.S. note ever circulated.

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While Roosevelt’s face graces the dime, it’s Treasury Secretary and Chief Justice Salmon P. Chase whose visage adorns the $10,000 bill. However, in 1969, the U.S. Treasury purged the $500, $1,000, $5,000, and $10,000 bills from circulation. (They still remain legal tender.)

For the St. Nicholas Bank of New York City, featuring the bank’s namesake on its currency made some sort of sense. But other banks, seemingly unaffiliated with Father Christmas, also issued Santa money. For example, the Howard Banking Company issued its Sinter Klaas note in the 1850s, which depicted a St. Nick scene from Dutch legend. A total of 21 banks in eight states created notes featuring Santa Claus, with seven of them even printing an entire Santa Claus vignette on their currency. These fun funds came to an end in 1863, when the National Bank Act created a national currency in an effort to standardize banking throughout the U.S. While these Santa bills are now considered “obsolete,” the notes remain highly prized in certain collecting circles and are doing much more than just ho-ho-holding their value. 

Numbers Don't Lie

Numbers Don't Lie

Year kids first met Santa Claus at a department store (in Brockton, Massachusetts)
1890
Weight (in pounds) of the “1-Tonne Australian Kangaroo,” the world’s largest gold coin (worth AU$1 million)
2,231
Average lifespan (in years) of a $100 bill (the $5 bill’s is 4.7 years)
22.9
Value of U.S. currency in circulation as of 2024
$2.32 trillion

American author ______ created the myth of Santa’s magic flying sleigh.

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American author Washington Irving created the myth of Santa’s magic flying sleigh.

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Paper money isn’t made out of paper.

Most paper — think newspapers, cardboard, and notebooks — is primarily composed of wood pulp. But this kind of paper could never handle the rough life of a U.S. dollar. Instead of relying on trees, all U.S. currency uses the same blend of cotton (75%) and linen (25%) with red and blue synthetic fibers running throughout. This blend is what gives greenbacks their distinctive feel as well as their increased durability compared to normal paper. According to the U.S. Currency Education Program, USDs can survive 4,000 double folds (front and back) before tearing.

Darren Orf
Writer

Darren Orf lives in Portland, has a cat, and writes about all things science and climate. You can find his previous work at Popular Mechanics, Inverse, Gizmodo, and Paste, among others.

Original photo by Claudine Klodien / Alamy Stock Photo

America has the eagle, England has the lion, and Scotland has the unicorn. And while the horned mythological creature may not actually exist, the traits it represents certainly do: Purity, independence, and an untamable spirit are all qualities Scotland has long cherished. Unicorns appeared on the country’s coat of arms starting in the 12th century, and were ​​officially adopted as Scotland’s national animal by King Robert I in the late 14th century. For many years, the coat of arms included two of the legendary beings, but in 1603 one was replaced by a lion to mark the Union of the Crowns. Fittingly for the then-newly united England and Scotland, folklore had long depicted the two creatures as butting heads to determine which one was truly the “king of beasts.”

The world’s shortest regular commercial flight is in Scotland.

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Just 2 miles separate the Scottish islands of Westray and Papa Westray, which means that the Loganair flight connecting them can last as little as 53 seconds. A number of locals depend on the eight-seat aircraft to go about their daily lives.

Scottish kings also displayed that fighting spirit, which may be why unicorns were generally depicted in Scottish heraldry as wearing gold chains — only the land’s mighty monarchs could tame them. Unicorns remain popular in Scotland to this day, with renditions found on palaces, universities, castles, and even Scotland’s oldest surviving wooden warship.

Numbers Don't Lie

Numbers Don't Lie

Whisky distilleries in Scotland
130+
Mentions of the word “unicorn” in the King James Bible
6
Year the Kingdom of Scotland ceased to exist as a sovereign state
1707
Estimated percentage of Scots with red hair, compared to 1% to 2% of the global population
6%-13%

The Loch Ness monster was first written about in the year ______.

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The Loch Ness monster was first written about in the year 565 CE.

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Royals used to test their food for poison with faux unicorn horns.

Neither unicorns nor their horns are real, but that hasn’t stopped people from attributing mystical properties to them for centuries. One case in point: European nobility circa the Middle Ages, who used so-called unicorn horns (also known as alicorn) to determine whether or not the meal they were about to consume had been poisoned. The “horns” were actually narwhal tusks in most cases, and were believed to sweat or change color if poison had been detected. Rhinoceros and walrus horns were also used — and all of these stand-ins could cost 10 times their weight in gold. Belief in their powers was widespread for centuries, with no less a monarch than Queen Elizabeth I being a devotee.

Michael Nordine
Staff Writer

Michael Nordine is a writer and editor living in Denver. A native Angeleno, he has two cats and wishes he had more.

Original photo by Cappan/ iStock

Rudolph’s nose may have been red, but his eyes were blue — except in the summer, when they would have been golden. That’s because reindeer eyes change color depending on the time of year, which helps them see better in different light levels. Their blue eyes are approximately 1,000 times more sensitive to light than their golden counterparts, a crucial adaptation in the dark days of winter. Only one part changes color, however: the tapetum lucidum, a mirrored layer situated behind the retina. Cats have it, too — it’s why their eyes appear to glow in the dark. This part of the reindeer retina shines a different hue depending on the season.

Male and female reindeer both grow antlers.

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Unlike other members of the Cervidae (read: deer) family, both male and female reindeer have antlers. They have this in common with bovids (goats, sheep, and antelopes), whose females use their horns like female reindeer use their antlers: to protect their food and territory.

Rudolph and his eight friends aren’t the only animals with unique eyes. Chameleons can move theirs independently of one another, giving them nearly 360-degree views of their surroundings; goats’ distinctive regular pupils give them a panoramic view of the horizon, allowing them to detect predators early; and cuttlefish pupils resemble a “W” in bright light and a circle in the darkness of deep waters — to name just a few unusual animal peepers. Maybe those critters should get songs written about them, too.

Numbers Don't Lie

Numbers Don't Lie

Miles some North American reindeer migrate each year
3,000
First airing of “Rudolph the Red-Nosed Reindeer,” the longest-running Christmas special
1964
Pounds of food an adult reindeer can eat in a single day
12
Reindeer in the Arctic National Wildlife Refuge’s Porcupine caribou herd
200,000

Caribou, another word for reindeer, means “______.”

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Caribou, another word for reindeer, means “snow shoveler.”

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Rudolph was created for a department store.

Long before he made his television debut, Rudolph graced the pages of a coloring book handed out to children visiting Santa Claus at Montgomery Ward department stores. Catalog copywriter Robert L. May was commissioned to create a memorable character for those books in 1939, and his creation was wildly successful — 2.4 million copies were given out the first year alone. This was despite the fact that May’s boss initially disliked Rudolph’s red nose because it could imply that the animal had been drinking. Rudolph was a household name within a decade, with the song we all know and love (which happens to have been written by May’s brother-in-law) recorded by none other than Gene Autry in 1949. He really did go down in history.

Michael Nordine
Staff Writer

Michael Nordine is a writer and editor living in Denver. A native Angeleno, he has two cats and wishes he had more.

Original photo by Jeff Siepman/ Unsplash

When considering a final resting place, most people ponder the conventional options, such as a coffin or, for those who prefer cremation, an urn. Not Pringles inventor Fredric Baur, whose devotion to his innovative packaging method (which stacks his perfectly curved creations in a tall tube) was so intense that he had his ashes buried in a Pringles can. “When my dad first raised the burial idea in the 1980s, I chuckled about it,” Baur’s eldest son, Larry, told Time of his father’s wishes. But this was no joke. So after the inventor died in 2008, his children made a stop on their way to the funeral home: a Walgreens, where they had to decide which can to choose. “My siblings and I briefly debated what flavor to use,” Larry Baur added. (Sour cream and onion? Barbecue?) “But I said, ‘Look, we need to use the original.’” Baur’s ashes now rest, in the can, at his grave in a suburban section of Cincinnati, Ohio.

Pringles used to have a different name.

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The chips were originally sold as Newfangled Potato Chips, but the name didn’t last. Some believe “Pringles” was taken from a street name in an Ohio telephone book, though this has never been confirmed.

Baur is far from the only person to choose an unconventional burial method — and many new choices have emerged across the world in recent years and decades. Star Trek creator Gene Roddenberry’s ashes were launched into space, a fitting resting place if ever there was one. Some people in Korea, meanwhile, have opted to have their ashes turned into sea-green beads that are placed in bottles or jars; the process is not unlike turning sand into glass. Those who prefer an environmentally friendly option, meanwhile, have encouraged the green burial movement, which prohibits spending eternity in nonbiodegradable containers — meaning that a Pringles container probably wouldn’t fly.

Numbers Don't Lie

Numbers Don't Lie

Pringles in an average can
80
Amount Kellogg’s paid to buy Pringles from Procter & Gamble in 2012
$2.7 billion
Flavors of Pringles ever produced
162+
Years of development before Pringles were first sold in 1968
7

The name of the Pringles mascot is ______.

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The name of the Pringles mascot is Julius Pringles.

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Pringles aren’t technically potato chips.

As far as the Food and Drug Administration is concerned, Pringles aren’t actually potato chips. Their main ingredient is dehydrated processed potato — not thin slices of fried potato, like in a typical chip — which led to a 1975 ruling by the FDA that they could only be labeled “chips” if they came with a disclaimer identifying them as “potato chips made from dried potatoes.” The company opted to market them as potato “crisps” instead.

Michael Nordine
Staff Writer

Michael Nordine is a writer and editor living in Denver. A native Angeleno, he has two cats and wishes he had more.

Original photo by S-F/ Shutterstock

Today, sharp-tongued verbal jousting primarily exists in the art form known as battle rap, in which two rappers take lyrical aim at each other with intricate (and often devastating) rhymes. During these battles, no insult — artistic or otherwise — is off-limits, and that’s a sentiment that 15th- and early 16th-century Scottish poets might have shared. Medieval Scottish men of words linguistically barbed each other in a practice known as “flyting” (based on the Old English word flītan, meaning “to quarrel”), often as entertainment for the Scottish king and his royal court. The most famous of these “battles” that still survives, known as “The Flyting of Dunbar and Kennedie,” featured Scottish poets William Dunbar and Walter Kennedy entertaining the court of James IV in the early 16th century. Among its many famous attributes, it’s the first recorded moment of scatalogical humor. (One of the more family-friendly examples of its insults, translated from Middle Scots, reads: “Grovel for grace, dog-face, or I shall chase you all winter; Howl and yowl, owl.”)

English is the only official language of Scotland.

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While English is the most widely spoken language in Scotland, a bill passed in 2025 gave both Scots and Gaelic official language status alongside English.

The biting lyricism of flyting wasn’t restricted to Scotland, of course. Ancient Irish professional poets, called filid, were also known for their insults, and a form of flyting can be found in Old English literature as well as the famous Norse text the Poetic Edda (in which the trickster god Loki goes on the verbal offensive against his fellow deities). Similar art forms can be found in Japan, Nigeria, parts of the Middle East, and elsewhere. Although flyting didn’t survive the Middle Ages, its influence can be seen in works ranging from Shakespeare to James Joyce. Thankfully, the birth of the rap battle in the 1980s once again provided a much-needed venue for settling serious artistic beef — and it’s been a fixture of hip-hop culture ever since.

Numbers Don't Lie

Numbers Don't Lie

Year Scottish poet Robert Burns wrote the poem “Auld Lang Syne,” now a New Year’s tradition
1788
Running time (in minutes) of the film “8 Mile” (about Eminem’s experience of the Detroit rap battle scene)
110
Followers of the YouTube channel “Epic Rap Battles of History”
15 million
Episodes of BET’s “106 & Park,” which featured rap battles during a segment called “Freestyle Friday”
3,710

The first major named poet to write in the Scots language was ______.

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The first major named poet to write in the Scots language was John Barbour.

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The first major rap battle, in 1981, was a transformative moment in hip-hop.

In December 1981, at the Harlem World club in New York City, hip-hop emcee Busy Bee Starski finished a set by bragging about his superior lyrical skills compared to other popular hip-hop artists at the time. Unknown to Busy Bee, one of those artists was in the crowd — another emcee named Kool Moe Dee. The dissed emcee took to the stage and dished a lyrical attack right back at Starski. His sharp, biting freestyle juxtaposed with Busy Bee’s simpler, more comedic technique sent rap in a new direction, in which emcees became more focused on serious lyricism rather than the typical party persona. Kool Moe Dee’s “battle” was recorded and became an influential mixtape that found its way onto the radio, and around the world.

Darren Orf
Writer

Darren Orf lives in Portland, has a cat, and writes about all things science and climate. You can find his previous work at Popular Mechanics, Inverse, Gizmodo, and Paste, among others.

Original photo by bgwalker/ iStock

While postal employees pride themselves on delivering mail in rain, sleet, and snow, they can still be impeded by sloppy handwriting. That’s why the U.S. Postal Service has a team of keen-eyed employees whose job is to determine where to send letters and packages with illegible addresses. More than 730 people work at the USPS Remote Encoding Center in Salt Lake City, Utah, which was the first facility of its kind and is now the last one standing.

Encoding centers peaked in 1997, when the USPS processed 19 billion pieces of difficult-to-read mail using 55 different facilities. But due to advances in computer analysis, as well as the fact that fewer people handwrite letters these days, just one facility dedicated to poor penmanship still operates today. The employees there play a pivotal role in analyzing the 3 million images of garbled addresses they receive each day.

The Hope diamond was shipped using U.S. mail.

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The Hope diamond was sent by U.S. mail from New York to Washington, D.C., on November 8, 1958. It was shipped by jeweler Harry Winston as a donation to the Smithsonian, where it remains on display today. Winston paid $2.44 ($27.35 today) for postage.

Here’s how it works: Before ever reaching the facility, mail is scanned by a computer to determine its destination. While this step is often successful on its own, sometimes the writing is so indecipherable that the address remains a mystery. When that’s the case, an image of the letter is scanned and sent to the encoding facility, where the average employee can rapidly decipher 900 pieces of mail every hour. In some cases, unintelligible letters are brought in for a last-ditch physical inspection, after which mail is either sent on its intended way, returned to sender, or (in rare cases) disposed of.

Numbers Don't Lie

Numbers Don't Lie

Auction price of the most expensive postage stamp ever sold
$9.48 million
Issue year of the first U.S. postage stamps
1847
Pens in the largest recorded collection of ballpoint pens
285,150
Characters in the longest novel ever written
9.609 million

The first woman to appear on a U.S. postage stamp was ______.

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The first woman to appear on a U.S. postage stamp was Martha Washington.

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There’s a floating post office with its own ZIP code.

The J.W. Westcott II, a mail-carrying boat that operates on the Detroit River, is the only floating post office in the United States. Its purpose is to deliver all mail addressed to crew members aboard the many freight ships that sail down the river. The boat uses a “mail in the pail” method, in which letters or packages are put into a bucket tied to a rope and hoisted onto the vessel.

The J.W. Westcott II was founded as a supply ship in 1874 and began doing mid-river mail transfers in 1895. It earned an official USPS contract in 1948 and was given its very own ZIP code, 48222 — the first nonmilitary floating ZIP code ever issued.

Bennett Kleinman
Staff Writer

Bennett Kleinman is a New York City-based staff writer for Inbox Studio, and previously contributed to television programs such as "Late Show With David Letterman" and "Impractical Jokers." Bennett is also a devoted New York Yankees and New Jersey Devils fan, and thinks plain seltzer is the best drink ever invented.

Original photo by Yuliya Apanasenka/ iStock

The @ symbol has been in use for centuries, since long before email made it one of the most-typed characters on Earth. The first documented use dates all the way back to a 1536 letter written by an Italian merchant, who used a looping “a” as shorthand for amphorae — a traditional unit of volume roughly equal to a standard clay amphora jar. In other contexts, medieval scribes also used the symbol to mean “at the rate of,” helping to make calculations and bookkeeping more efficient.

As global trade expanded, merchants began using @ in ledgers to indicate price per unit — for example, three barrels @ five florins each. That practical function kept the symbol alive for hundreds of years, even as writing styles, currencies, and languages evolved. The average person, however, rarely encountered it outside of accounting and typewriters.

The “Q” in the QWERTY keyboard name stands for “quick.”

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The letters “QWERTY” don’t represent words — they are the first six letters on the top row of a computer keyboard.

That changed dramatically in 1971, when computer engineer Ray Tomlinson needed a character to separate a username from a host computer in the world’s first networked email. It had to be a symbol that was rarely used in names, yet widely understood across keyboards. He selected @, a typographic character used by developers that at the time meant “located at” — as in “user at computer.”

More than five decades later, the @ symbol now helps route billions of messages daily and anchors our digital identities across email and social platforms. Not bad for a 16th-century bookkeeper’s shorthand.

Numbers Don't Lie

Numbers Don't Lie

Email accounts worldwide
7.9 billion
Year the Museum of Modern Art added the @ symbol to its design collection
2010
Keys on a standard full-size U.S. keyboard
104
Year the @ symbol first appeared on a typewriter keyboard
1889

When it first appeared on a typewriter keyboard, the @ symbol was known as the ­­“______”

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When it first appeared on a typewriter keyboard, the @ symbol was known as the ­­“commercial ‘a.’

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The @ symbol has many nicknames.

Despite its universal function, there is no globally recognized name for the @ symbol. In the U.S., it’s most commonly known as the “at sign,” and in modern computing terminology, it’s called the “commercial at” (formerly “commercial ‘a’”).

Across other languages, the names are far more imaginative. Several countries have nicknames related to monkeys, likely because of the symbol’s swirling tail. German speakers call it “spider monkey” (klammeraffe) or “monkey’s tail” (affenschwanz). Dutch speakers also use “monkey tail” (apestaart), and Polish speakers refer to it simply as “monkey” (małpa).

Some cultures see other animals in the distinctive curves. Danish speakers have two names for the symbol: “pig’s tail” (grisehale) and “elephant’s trunk” (snabel ). In Russia, it’s called “dog” (sobachka), and in Greece it’s “duckling” (papaki). Italians call it “snail” (chiocciola), while Hungarians refer to it as “worm” (kukac).

Kristina Wright
Writer

Kristina is a coffee-fueled writer living happily ever after with her family in the suburbs of Richmond, Virginia.

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The brothers behind your favorite frozen waffles took a while to iron out the details of their signature product. Working in their parents’ basement in San Jose, California, in the early 1930s, Frank, Anthony, and Sam Dorsa first whipped up their own brand of mayonnaise. Since the base ingredient of mayonnaise is egg yolks — and the brothers took pride in using “100% fresh ranch eggs” — they christened their fledgling company “Eggo.” Despite launching the business during the Great Depression, Eggo mayonnaise sold like hotcakes, motivating the Dorsas to extend their product line. Soon, they were selling waffle batter — another egg-based product. To simplify shipping, they also whipped up a powdered mix that required only the addition of milk. 

Since Waffle House locations are open 24/7, they do not have locks on their doors.

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Locks are in place to protect each restaurant when it's under construction prior to opening day. Once customers start visiting, the locks are used during rare closures such as a remodeling or when, in March 2020, 418 outposts temporarily shuttered in response to COVID-19.

When the frozen food industry took off in the 1950s, the brothers wanted to take advantage of the rush to the freezer aisle. Frank Dorsa (a trained machinist) repurposed a carousel engine into a rotating device that could anchor a series of waffle irons, each cooking a breakfast treat that was flipped by a factory employee. The machine allowed Eggo to prepare thousands of freezer-bound waffles per hour. These debuted in grocery stores in 1953 under the name Froffles, a portmanteau of “frozen” and “waffles.” Customers referred to them simply as “Eggos,” and the Froffles moniker was dropped within two years. Now a Kellogg's-owned brand, Eggo serves up waffles as well as other frozen breakfast treats, with mayonnaise — and the name Froffles — but a distant memory.

Numbers Don't Lie

Numbers Don't Lie

Century in which waffle-eating parties called “wafel-frolics” became popular in the U.S.
18th
Date the first modern waffle iron was patented (August 24 is now known as National Waffle Day)
August 24, 1869
Weight (in pounds) of the world’s largest waffle, created in the Netherlands in 2013
110
Americans who ate frozen waffles, pancakes, or French toast in 2020
163.9 million

On the NBC sitcom “______,” Leslie Knope ordered waffles whenever she got the chance.

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On the NBC sitcom “Parks & Recreation,” Leslie Knope ordered waffles whenever she got the chance.

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Waffles helped inspire the original Nike sneaker design.

When Blue Ribbon Sports — the company that became Nike — was founded in 1964 by Phil Knight and his former college track-and-field coach, Bill Bowerman, its original business model was importing Japanese sneakers to sell in Oregon and California. Yet Bowerman had been experimenting with cobblery since the 1950s, and in 1970, he challenged himself to create a light, comfortable shoe that would give his athletes the traction to run on various surfaces. One morning, as Bowerman’s wife, Barbara, used their waffle iron, he began to brainstorm, deciding that a 3D lattice pattern could cushion runners’ steps. From his in-house lab, Bowerman retrieved the chemicals that form urethane, a type of rubber. Then he poured his mixture straight onto the hot waffle maker. The waffle design that eventually resulted was patented in 1974, the year Nike began selling its rubber-soled Waffle Trainer. In 2019, a pair of Bowerman’s unworn prototypes — the Nike Waffle Racing Flat “Moon Shoe” sneakers — sold at auction for $437,500.

Jenna Marotta
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Jenna is a writer whose work has appeared in The New York Times, The Hollywood Reporter, and New York Magazine.

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When detectives investigate a crime scene in any prime-time cop drama, they’re often on the hunt for one thing: fingerprints. Because these intricate patterns of whorls and lines are exclusive to each individual, fingerprints have been a go-to method for tracking down suspects for more than a century. However, our fingerprints are not unique when it comes to being, well, unique. Our tongues, like our fingerprints, are also specific to each individual. That’s right — people have tongue prints, which vary from one person to another due to both shape and texture. And perhaps surprisingly, the organ has been gaining some popularity as a method for biometric authentication.

Frogs have the fastest tongue of any animal.

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The world’s fastest tongue belongs to the 2-inch-long rosette-nosed chameleon (Rhampholeon spinosus), whose tongue can accelerate at an astounding 1.6 miles per seconds squared. Smaller chameleons have faster tongues in part because their high metabolisms mean they eat more often.

Where fingerprints can be altered, eyes affected by astigmatisms or cataracts, and voices changed just by the all-too-common cold, the human tongue is relatively protected from external factors. Sticking out one’s tongue for a print also involves a layer of conscious control and consent that goes beyond what’s required for retinal scans or even fingerprinting, which could make it a more appealing biometric tool for some. In fact, these “lingual impressions” may be so advantageous over other forms of authentication that some researchers have started investigating the idea of a tongue print database, using high-resolution digital cameras to record every ridge, line, and contour of that muscular organ in our mouths. Although promising, this research is in its early stages — meaning that “lick to unlock” won’t be an iPhone feature any time soon.

Numbers Don't Lie

Numbers Don't Lie

Number of known extended families who have adermatoglyphia (hands without fingerprints)
4
Estimated maximum number of taste buds in the average human tongue
4,000
Length (in feet) of the world’s longest tongue, belonging to the giant anteater (Myrmecophaga tridactyla)
2
Number of muscles in the human tongue
8

The ______ were the first to use fingerprints as a means of identification.

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The Chinese were the first to use fingerprints as a means of identification.

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Tongue rolling isn’t a genetic trait.

Whether it was in a biology class or from a friend, you’ve likely heard the story that tongue rolling ― that is, forming your tongue in the shape of a “u” — is a genetic trait (shared by an estimated 65% to 81% of people). Although that may seem plausible at first, the genetic explanation of tongue-rolling is actually a persistent myth, and one still found in some biology textbooks today. The idea dates back to 1940, when geneticist Alfred Sturtevant suggested that tongue-rolling was a Mendelian trait — meaning the ability isn’t a combination of parental genes but instead inherited from one parent or the other. However, a study in 1952 involving 33 identical twins (who share the same genetic makeup) found that seven pairs didn’t share the same tongue-rolling trait. Other studies have found that two nonrolling parents can produce offspring who can roll their tongue, suggesting that the “skill” isn’t simply genetics. Sturtevant eventually retracted the idea, yet the myth lives on.

Darren Orf
Writer

Darren Orf lives in Portland, has a cat, and writes about all things science and climate. You can find his previous work at Popular Mechanics, Inverse, Gizmodo, and Paste, among others.