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Stroll through the baking aisle at any grocery store, and you’ll likely find instant cake mixes and containers of frosting emblazoned with the Duncan Hines name. But unlike other boxed-mix personalities (looking at you, Betty Crocker), Hines was a real-life food personality whose name was once synonymous with fine dining. For a man who couldn’t cook, Hines became a surprisingly well-trusted authority on American cuisine for nearly three decades, all thanks to an iron stomach and fearless forays into restaurant kitchens. 

Duncan Hines rated American restaurants before the Michelin Guide did.

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The Michelin Guide is known for ranking fine dining establishments with a three-star system dating back to 1900. But the European brand didn’t review eateries across the Atlantic until 2005 — almost 70 years after Duncan Hines published his first guide to American restaurants.

Born in Kentucky in 1880, Hines worked as a traveling salesman from the 1920s through the ’40s, a life that didn’t allow for regular home-cooked meals. While putting anywhere from 40,000 to 60,000 miles on the road each year, he kept a meticulous journal of his dining experiences, listing noteworthy restaurants that provided budget-friendly dishes. But Hines didn’t just review meals — at a time when health codes and food inspections weren’t yet standard, he went so far as to audit kitchens himself, monitoring food safety practices and cleanliness, and even examining the garbage. 

Flooded with requests from fellow travelers, Hines attached a list of 167 restaurants to his 1935 Christmas card. A year later, he self-published Adventures in Good Eating, a comprehensive compendium of U.S. eateries that was updated annually until 1962. With each edition, Hines solidified his reputation for honest critiques, in part because he refused payment for good reviews (though he did profit from renting signs bearing his stamp of approval to restaurants, and once accepted a gifted Cadillac from a happy restaurant owner). By 1949, Hines had teamed up with businessman Roy Park to launch Hines-Park Foods, which sold under the Duncan Hines label — moving the reviewer’s name from print to the containers of more than 250 grocery items. The brand’s iconic boxed cake mixes debuted in July 1951 in just two flavors  — vanilla and devil’s food. Today, the cake mixes are beloved by many, even if the man who originally helped create them has been forgotten.

Numbers Don't Lie

Numbers Don't Lie

Hines’ budget-friendly, preferred price for a restaurant meal in 1935
$1.25
Last year Hines’ compendium was published, three years after his death
1962
Estimated number of guidebook copies Hines sold annually by 1959
300,000
Number of Americans who purchased a boxed cake mix in 2020
186 million

The first big Duncan Hines product was ______, not cake mix.

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The first big Duncan Hines product was ice cream, not cake mix.

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The first cake mix was invented during the Great Depression.

Duncan Hines’ cake mixes were a hit with home cooks, but the idea for easy-to-prepare baked desserts wasn’t at all original — another company had created and sold instant cake mixes almost two decades before Hines’ name graced grocery store aisles. P. Duff and Sons, a Pittsburgh molasses company, launched the first commercially available mixture in 1930 out of necessity; the company experienced a molasses surplus and sought out a creative way to boost sales. By combining flour and molasses (along with powdered eggs, spices, and more), Duff and Sons created instant cake blends in popular flavors such as devil’s food and spice cake, along with a line of muffins and breads. While launching a new product during the Great Depression might seem like a gamble, the company sold its tins at 21 cents, marketing them as a cost-efficient way for cooks to provide a tasty dessert without the expense of buying individual ingredients. Even so, it wasn’t until after World War II that boxed cake mixes became grocery store standards, as flour companies and others served a burgeoning market once the GIs returned home.

Nicole Garner Meeker
Writer

Nicole Garner Meeker is a writer and editor based in St. Louis. Her history, nature, and food stories have also appeared at Mental Floss and Better Report.

Original photo by aphotostory/ iStock

Traversing thousands of miles across eastern Asia, the Great Wall of China has stood as a symbol of the country’s military and technological know-how for more than 2,000 years. And thanks to a team of scientists at Zhejiang University, we now know that the secret to its legendary endurance is … sticky rice soup?

As explained in Accounts of Chemical Research in 2010, the scientists stumbled upon this discovery while examining mortar samples from the Great Wall and other long-standing Chinese buildings. They realized the mortar was an unusual composite created from slaked lime and congee, the former a heated type of limestone exposed to water, and the latter a pudding-like rice porridge commonly eaten throughout Asia. When combined with the lime’s calcium carbonate, a complex carbohydrate in the congee known as amylopectin helped stymie the development of calcium carbonate crystals in the mortar, resulting in a compressed structure that gave the ancient barrier the strength to withstand earthquakes and bulldozers.

The Great Wall of China is visible from the moon.

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The Great Wall’s similar coloring compared to the surrounding landscape renders its identification from the lunar surface a futile task. Experts say that the wall can be discerned by the human eye only in low orbit under favorable lighting conditions.

While not invented until around the fifth century CE, well after the initial parts of the Great Wall were raised, the sticky rice-lime mortar was used for the well-preserved sections that remain from the Ming dynasty (the 14th through 17th centuries). Which all goes to show that along with fueling the diet of a country of 1.4 billion people, this simple porridge packs enough power to keep historic structures upright through all sorts of human- and nature-instigated onslaughts.

Numbers Don't Lie

Numbers Don't Lie

Length (in miles) of the Great Wall, per a 2012 Chinese government report
13,171
Maximum daily visitors allowed at the Badaling section of the Great Wall
65,000
Year the Great Wall was designated a UNESCO World Heritage Site
1987
Calories in a slice of P.F. Chang’s The Great Wall of Chocolate cake
1,700

Sticky rice has low amounts of the starch known as ______.

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Sticky rice has low amounts of the starch known as amylose.

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Architects are exploring the possibilities of building with salt.

Porridge isn’t the only kitchen product used to build magnificent structures, as salt is capable of surprising results in that capacity as well. The concept of salt-based buildings is actually a pretty old one: First-century Roman dignitary Pliny the Elder wrote of seeing “towers built of square blocks of salt” in the Middle Eastern city of Gerrha, while 14th-century explorer Ibn Battuta described the salt mosques in the African village of Taghaza. Of course, the mineral was mainly prized in antiquity for its food storage and preparation capabilities, while its propensity to dissolve in water presented sustainability problems. Nevertheless, modern builders are increasingly hungering for salt as a versatile, environmentally friendly component of the construction and design processes. Given its widespread availability, it may not be long before salty projects like Bolivia’s Palacio de Sal hotel go from novelty dish to main course as architectural innovations continue to evolve.

Tim Ott
Writer

Tim Ott has written for sites including Biography.com, History.com, and MLB.com, and is known to delude himself into thinking he can craft a marketable screenplay.

Original photo by Venti Views/ Shutterstock

The Golden Gate Bridge is the most recognizable part of San Francisco’s misty skyline, not least because of its vibrant orange color, but the iconic structure was almost painted an entirely different hue — or rather, two entirely different hues. The idea of connecting parts of California’s Marin County with San Francisco via a bridge dates back to 1869, but plans for the architectural wonder didn’t take shape until 1916. Despite a hefty $35 million bill amid the Great Depression, the bridge project broke (underwater) ground in 1933. When it came time to choose a paint color two years into the build — a necessity to prevent rust on the steel caused by the underlying salt water — there was no obvious choice. The U.S. Navy, for one, recommended a black-and-yellow-striped design intended to increase visibility for ships and airplanes operating in foggy weather, while the Army Air Corps reportedly favored red and white stripes. Architect Irving Morrow rejected the idea (along with the commonly used gray and silver), settling instead on the vivid “International Orange” after seeing the bridge primed in a vermillion hue and believing the color would complement the surrounding landscape while providing high visibility. The bridge officially opened on May 27, 1937, painted in its gleaming new hue.

The Golden Gate Bridge has its own fog horns.

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Despite its blazing hue, the Golden Gate Bridge is known for disappearing into San Francisco’s famous fog. Two fog horns protect the bridge from boats below, blaring upwards of five hours a day — or more — during August’s peak fog.

Exactly how the Golden Gate Bridge maintains its iconic glow is something of a maintenance marvel that’s shrouded in myth. Popular theories suggest that the 1.7-mile overpass is entirely repainted from end to end annually, or just once every seven years, but in fact caretakers continuously have paint brushes in hand. Crews note areas of the bridge where paint has worn away, then spot-paint sections as needed. The work is tedious, requiring high climbs atop the structure’s 746-foot towers and its underbelly, which sits just 200 feet above the bay. Workers use specialized equipment and brushes to remove old paint, prime the underlying steel, and lacquer on the standout shade. The bridge has been fully repainted only one time — beginning in 1968 — to remove its failing, original lead-based paint; the task took 27 years and wasn’t finished until 1995.

Numbers Don't Lie

Numbers Don't Lie

Gallons of “International Orange” used to initially paint the Golden Gate Bridge
110,000
Individual wires in each of the bridge’s two main support cables
25,572
Toll cost for crossing the Golden Gate Bridge one way in 1937 (about $10.29 today)
$0.50
Year the first movie monster destroyed the bridge on screen (in “It Came From Beneath the Sea”)
1955

San Francisco’s iconic fog is nicknamed ______.

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San Francisco’s iconic fog is nicknamed Karl.

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The Golden Gate Bridge isn’t named for its color.

While the Golden Gate Bridge does seem to shimmer in the California sun, it wasn’t named for its vibrant paint job. The moniker actually refers to the Golden Gate Strait, the underlying waterway connecting the San Francisco Bay to the Pacific Ocean. Captain and explorer John C. Frémont came up with the name in 1846, inspired by the similarities between the 377-foot-deep channel and Istanbul’s Golden Horn harbor. Incidentally, Frémont — who later held political office in California, ran as the nation’s first Republican presidential candidate in 1856 (losing to James Buchanan), and served as a Union general in the Civil War — has been timelessly memorialized on street signs and city designations, including a bridge bearing his own name in Portland, Oregon.

Nicole Garner Meeker
Writer

Nicole Garner Meeker is a writer and editor based in St. Louis. Her history, nature, and food stories have also appeared at Mental Floss and Better Report.

Original photo by DROPERDER/ Shutterstock

One of the most complex parts of human anatomy is also one (or rather two) that we use hundreds of times per day yet often take for granted. Human hands are the body’s multipurpose tools, equipped with 27 individual bones. About half of those are found in our fingers, the tactile appendages that will bend and flex roughly 25 million times over the course of our lifespan. Our fingers are able to perform the everyday tasks we need thanks to thousands of nerve endings and touch receptors that can sense pressure, texture, temperature, movement, and more. But there’s one thing our hardworking digits don’t have: muscles.

Fingernails grow faster than toenails.

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Fingers and toes are topped with nails for good reason: Both help protect our delicate digits by preventing injuries and infections. However, these nails don’t grow at the same speed. A 2010 study found fingernails grow twice as fast as toenails, on average.

Muscles make it possible for our bodies to move, and the human frame relies on more than 600, which are tasked with helping us in nearly every motion. So how do fingers perform the intricate tasks we require without them? Turns out, human fingers are controlled by the muscles in our forearms and the tops and palms of our hands. Small intrinsic muscles in the hand allow the fingers to perform fine motor movements, while extrinsic muscles in the forearm and elbow control how the wrist and hand move. Finger bones (aka phalanges) are connected to these muscles by tendons — fibrous, cordlike connective tissues — and when the attached muscles contract, fingers are able to perform their range of motion. Flexor tendons in the palm help fingers to bend, while extensor tendons on the top of the hand are responsible for straightening the fingers back out — essential movements that allow our hands to touch, grasp, and hold objects.

Numbers Don't Lie

Numbers Don't Lie

Bones in each finger, excluding thumbs (which have only two bones)
3
Time (in milliseconds) it takes to snap our fingers, about 20 times faster than blinking
7
Muscles in the human hand
30+
Puppets in the world’s largest finger puppet collection (as of 2023)
1,517

The ______ has copper fingers that measure 8 feet long.

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The Statue of Liberty has copper fingers that measure 8 feet long.

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Some primates have six fingers.

Primates and humans tend to share some similarities, like having five fingers on each hand (along with five toes on each foot). But just like in the human world, there are anomalies among primates — like the aye-aye, a six-fingered lemur. Native to Madagascar, aye-ayes are the world’s largest nocturnal primate, utilizing batlike ears that echolocate their prey. As researchers recently discovered, aye-ayes also differ from their primate relatives by relying on an extra thumblike digit found near their wrist, though it’s unclear just how the finger is used. Aye-aye finger-related differences don’t end there; the lemurs tap their exceptionally long middle fingers against logs and limbs, using the reverberations to eke out an insect’s hiding spot before digging them out.

Nicole Garner Meeker
Writer

Nicole Garner Meeker is a writer and editor based in St. Louis. Her history, nature, and food stories have also appeared at Mental Floss and Better Report.

Original photo by EKKAPHAN CHIMPALEE/ Shutterstock

Who knew the California gold rush would spin off a fashion trend that has lasted nearly 150 years? Probably not the gold miners who donned Levi Strauss’ first denim pants. The jeans we wear today as casual apparel initially had a different function, marketed as sturdy work pants that could withstand a day in the mines or manual labor on a farm. And they had a different name, too: waist overalls.

Strauss, a Bavarian immigrant who ran a dry goods store in San Francisco during the 1850s, catered to prospectors and settlers looking to strike it rich in California’s gold claims. But while Strauss’ name is sewn into the history of jeans, the idea for heavy-duty apparel actually came from Jacob Davis, a Reno, Nevada, tailor who was a customer at Strauss’ store. Around 1872, Davis approached Strauss with a concept for work pants that used copper rivets and stitching to bulk up the weakest points of traditional pants; within a year the duo had patented their design for denim workwear, initially available in indigo or brown hues. Strauss marketed the waist overalls under the Levi Strauss & Company name, first commissioning seamstresses to stitch the pants together from their homes before building a factory in the 1880s. Over time, Strauss added designs for other reinforced work clothes such as shirts, true overalls, and coats.

Indigo dye was once used as currency in the United States.

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Denim originally obtained its distinctive color from indigo dye, an expensive pigment so valued that traders exchanged it for goods around the time of the American Revolution. Inexpensive synthetic dyes first emerged in the 1850s, and today, most jeans are colored with artificial hues.

As the gold rush era wound down, the popularity of jeans grew with the help of Hollywood Westerns of the 1920s and ’30s. World War II skyrocketed denim “dungarees” to popularity thanks to their durability; jeans became standard issue for soldiers and factory workers alike. But it was the postwar ’50s and turbulent ’60s that cemented the pants as everyday wear. Actors such as Marlon Brando in 1953’s The Wild One and James Dean in 1955’s Rebel Without a Cause gave denim a counterculture reputation and helped usher in a trendy, new name: jeans, a centuries-old name for denim that originally came from the French name for the port of Genoa, Italy: Génes.

Numbers Don't Lie

Numbers Don't Lie

Pounds of cotton needed to make one pair of jeans
1.5
Cost of one pair of Levi’s jeans in the 1880s
$1.25
Approximate length (in feet) of the world’s largest jeans
250
2025 revenue for Levi Strauss & Co.
$6.3 billion

The tiny front pocket sewn onto jeans was originally meant to hold a ______.

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The tiny front pocket sewn onto jeans was originally meant to hold a pocket watch.

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There’s no clear reason why pants come in a “pair.”

While the word “pants” has a generally accepted origin (see below), linguists say there’s no certain answer as to why we identify the one-piece clothing item as a pair. But it could be because some bottoms of the past came in a set of two. The word “pants” is derived from pantaloons, a name for trousers that cropped up in mid-1600s England in connection with the character Pantalone, from the Italian commedia dell’arte, who wore tight breeches and stockings. While most pants and breeches through time have been one piece of apparel, some undergarments — particularly those for women, girls, and young boys during the 18th century — consisted of sleeve-like coverings that were slid on individually and tied together at the waist. Considering that those pantaloons came in a set, some historians believe it’s possible that referring to them as a pair stuck around, even for unsplit trousers. Interestingly, pants are considered plurale tantum — a word only ever used in plural form — which is common among other singular items that have two main internal components, such as tweezers, glasses, scissors, and sunglasses.

Nicole Garner Meeker
Writer

Nicole Garner Meeker is a writer and editor based in St. Louis. Her history, nature, and food stories have also appeared at Mental Floss and Better Report.

Original photo by Vidar Nordli-Mathisen/ Unsplash

When we think of pirates, some instantly recognizable iconography comes to mind: eye patches, peg legs, treasure maps, parrots. But as it turns out, only some of these ideas are grounded in truth. For one thing, as far as we know, pirates did not, in fact, make treasure maps. Though they are believed to have buried treasure on occasion — those ill-gotten gains had to go somewhere — there are few documented cases of them doing so, and even fewer (read: none) of them creating a map where “X” marks the spot. Treasure maps are a double-edged cutlass, after all: For as much help as they might be to the pirate in question, they could also fall into the wrong hands. 

Pirates made people walk the plank.

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Like drawing treasure maps, walking the plank is thought of as a classic pirate activity. But there’s little evidence that it ever happened, and it seems we have Daniel Defoe and other writers to thank for creating the myth in the first place.

The myth of treasure maps may have originated with the legendary exploits of Captain William Kidd, who was believed to have buried some of his riches on Gardiner’s Island in the 17th century. Novels like Robert Louis Stevenson’s Treasure Island (1881-1882) helped further popularize the idea of buried treasure in general and treasure maps in particular.

In fact, many of our ideas about pirates come more from novelists (and, of course, screenwriters) than from historians, which makes it difficult to separate truth from legend when it comes to the seafarers, who have long occupied an outsized place in our collective imagination. There is some good news, though: It seems likely that some pirates really did have parrots — among other exotic pets.

Numbers Don't Lie

Numbers Don't Lie

Estimated possible value of all sunken treasure in the world
$60 billion
Year the golden age of piracy is said to have begun
1650
Pirates active during the golden age
5,000
Cumulative world box-office gross of the “Pirates of the Caribbean” franchise
$4.5 billion

Blackbeard’s real name was ______.

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Blackbeard’s real name was Edward Teach.

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The most successful pirate in history was a woman.

With 1,800 ships and 70,000 men under her command, Zheng Yi Sao — better known as Madame Cheng — is in many regards the most successful pirate in history. A former prostitute who married into the business, she took over her husband’s Red Flags Fleet after his death in 1807. After surviving multiple assassination attempts by the Chinese government, she struck a deal that allowed her to retire peacefully in 1810.

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 tartanparty/ Shutterstock

Yard sales are an American tradition — especially along U.S. Route 127. It’s there that you can find the famous 127 Yard Sale, an annual event on the first Thursday through Sunday in August, featuring thousands of vendors on front lawns and in church parking lots in Alabama, Georgia, Tennessee, Kentucky, Ohio, and Michigan. All in all, the “world’s longest yard sale” covers 690 miles, starting near Addison, Michigan, and ending in Gadsen, Alabama. The inaugural event took place in 1987, when a Tennessee county executive named Mike Walker conceived of the idea to encourage travelers to bypass the big interstate highways in favor of experiencing life in more rural communities. 

The concept of a yard sale originated at old shipyards.

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The word “rummage” was originally used to describe arranging objects stowed in the hold of a ship. Upon arriving at port, sailors would take all of the leftover and damaged cargo and resell it on the pier — hence the origins of the modern phrase “rummage sale.”

Yard sales aren’t just a great way for vendors to declutter, though — they can also be a literal treasure trove. In 2013, a seemingly nondescript ceramic bowl that had been purchased at a garage sale for $3 in 2007 sold at Sotheby’s for $2.2 million; it turned out to be a 1,000-year-old piece of pottery from the Northern Song dynasty. Even the Declaration of Independence has found its way to the bargain bin — a first printing was purchased at a flea market in 1991 because the buyer wanted the picture frame. It later went on to sell at auction for $2,420,000.

Who knows what treasures await at the 127 Yard Sale? This year’s event is August 6 to August 9, so you still have time to plan your road trip.

Numbers Don't Lie

Numbers Don't Lie

Year ​​U.S. Route 127 opened
1926
Average number of yard sales held each week in the U.S., as of 2013
165,000
Miles you would have to cover every day to cover the entire 127 Yard Sale route
172.5
Estimated number of items sold at yard sales each week
4,967,500

National Garage Sale Day occurs on the second Saturday in ______.

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National Garage Sale Day occurs on the second Saturday in August.

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Oprah Winfrey hosted a “yard sale” that raised over $600,000 for charity.

In 2013, Oprah Winfrey decided to declutter her various homes and hold a massive auction-style yard sale that she called “the biggest yard sale ever” to support one of her charities, the Leadership Academy for Girls in South Africa. The sale included items from her Montecito mansion and three additional properties in Santa Barbara. The value of each item was, of course, boosted through its association with Oprah, including a nondescript teapot worth less than $100 that ultimately went for over $1,000. That’s not to say all the items were so mundane — a set of six 18th-century Louis XVI armchairs fetched $60,000. With that major sale, plus several velvet-clad sofas that sold for $8,750, a print of one of Oprah’s “TV Guide” covers that raked in $3,000, and many more household items, the event — held at the Santa Barbara Polo and Racquet Club — raised more than $600,000 in all.

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 © Dorling Kindersley RF/ Getty Images

Woodpeckers rank among nature’s most extraordinary engineers, especially when it comes to excavation. They use their beaks to hammer away at tree trunks up to 20 times per second. It’s an ability that raises one obvious question: How do they not knock themselves out? For a while, scientists thought part of the answer lay in the woodpecker’s extraordinarily long tongue — a tongue so long it wraps around the bird’s skull. 

A woodpecker’s tongue, when considered in conjunction with the entire hyoid apparatus (a system of bones and muscles that controls tongue movement), originates at the upper beak, runs up the forehead and between the eyes, then loops around the back of the skull before coming out at the base of the lower beak. Some woodpeckers have tongues 4 to 5 inches long, roughly one-third of their total body length. In addition to being extra-long, woodpecker tongues are sticky and covered in tiny barbs at the tip, which helps them extract insects from deep inside tree holes.

Lemurs have a second tongue they use for grooming.

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Lemurs — the small, large-eyed primates that live on the island of Madagascar — have a second tongue, known as a sublingua, located underneath their main tongue. It aids in their social grooming rituals.

For decades, scientists believed those long, skull-encompassing tongues served a second remarkable purpose: protecting the woodpecker’s brain from injury through shock absorption. It’s easy to see why biologists and ornithologists found the idea so compelling; the tongue could quite logically act as a shock absorber around the skull.

Engineers have even modeled football and bicycle helmets on this supposed woodpecker anatomy, implementing liners with multiple layers of different materials and densities. Those designs mimic the woodpecker’s cranial anatomy to create helmets that cradle the head more completely and redirect force away from the brain from multiple angles simultaneously.

For a long time, the incorrect theory about woodpecker tongues protecting the brain gained traction and was propagated online. Then, in 2022, researchers demolished the hypothesis using high-speed cameras. Frame-by-frame video analysis showed that woodpecker skulls act like stiff hammers and don't have built-in shock absorption.

So the tongue wrapping, while real and spectacular, has nothing to do with protecting the brain. What actually keeps a woodpecker’s noggin safe is a combination of its small, tightly fitted brain, the brain’s tilted position within the skull, and the very brief duration of each impact — too short for damaging force to accumulate.

Numbers Don't Lie

Numbers Don't Lie

Height (in feet) of the Pentaceratops skull, the largest land animal skull ever discovered
10.5
Depth (in feet) of the deepest hole ever dug into Earth
40,236
Most words ever learned by a bird (a budgerigar named Puck)
1,728
Length (in inches) of the bar-breasted piculet, the world’s smallest woodpecker
3

Woody Woodpecker is the official mascot of ______.

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Woody Woodpecker is the official mascot of Universal Studios.

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A blue whale’s tongue weighs the same as an entire adult elephant.

We sometimes underestimate just how massive a blue whale actually is. Many people assume the largest dinosaurs were bigger than anything in existence today, but that’s not true: The blue whale is by far the largest known animal ever to have graced our planet. An adult can grow to more than 100 feet in length and weigh up to 200 tons — about the same as 30 comparatively puny Tyrannosaurus rexes put together.

The blue whale is so huge that its tongue alone can weigh as much as 4 tons, making it the largest and heaviest tongue in the world by far. To put it into perspective, a blue whale’s tongue weighs about the same as an adult Asian elephant. And if one of those magnificent whales were to open its mouth to a bunch of curious humans, its tongue would have enough surface area to comfortably accommodate 50 standing people.

Tony Dunnell
Writer

Tony is an English writer of nonfiction and fiction living on the edge of the Amazon jungle.

Original photo by © lesniewski/stock.adobe.com

France’s colonial empire reached its peak centuries ago, but it hasn’t been entirely lost to history. There are still five French overseas departments today: Guadeloupe and Martinique in the Caribbean, Mayotte in the Mozambique Channel, Réunion in the Indian Ocean, and French Guiana in South America. 

The last of those is responsible for France’s longest border, which is with the Brazilian state of Amapá and spans 454 miles. With a population of 293,200, about half of whom live in the metropolitan area of Cayenne (the capital), French Guiana also borders Suriname to the west and the Atlantic Ocean to the northeast. France itself borders Belgium, Luxembourg, Germany, Switzerland, Italy, Monaco, Andorra, and Spain; the longest of those, with Spain, stretches 401 miles.

Brazil built a new city specifically to be its capital.

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Brasília was founded in 1960 to replace Rio de Janeiro as the country’s capital. Brasília is more centrally located and was intended to stimulate the economy in Brazil’s interior.

Brazil, meanwhile, borders nine other countries: Argentina, Bolivia, Colombia, Guyana, Paraguay, Peru, Suriname, Uruguay, and Venezuela; the longest of these boundaries, at 2,115 miles, is with Bolivia. (The only South American countries Brazil doesn’t border are Chile and Ecuador.) 

Inhabitants of overseas departments and regions of France (DROM) are French citizens. Their currency is the euro, they elect members of the French Parliament, and they’re beholden to French laws. French is the official language of French Guiana, but French Guianese Creole is widely spoken as well.

Numbers Don't Lie

Numbers Don't Lie

Total length (in miles) of Brazil’s international borders
10,492
FIFA World Cups won by Brazil, the most of any country
5
FIFA World Cups won by France
2
Regions of mainland France
13

France’s mainland is nicknamed the “______.”

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France’s mainland is nicknamed the “Hexagon.”

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The world’s longest border is between Canada and the United States.

At 5,525 miles, the border between Canada and the United States is the longest in the world. It spans 13 U.S. states (Maine, New Hampshire, Vermont, New York, Pennsylvania, Ohio, Michigan, Minnesota, North Dakota, Montana, Idaho, Washington, and Alaska) and eight Canadian provinces/territories (New Brunswick, Québec, Ontario, Manitoba, Saskatchewan, Alberta, British Columbia, and Yukon).

The border isn’t continuous, however, and Alaska alone accounts for 1,538 miles of it. The longest continuous border is between Kazakhstan and Russia, spanning 4,750 miles. Other notably extensive borders include Argentina/Chile (4,185 miles), China/Mongolia (2,877 miles), Russia/China (2,597 miles), and India/Bangladesh (2,574 miles).

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 © Point Normal/Unsplash.com

Most mammals, including humans, have two sets of teeth: deciduous teeth (also called baby teeth or milk teeth), which fall out as the jaw grows to an adult size, and permanent teeth that replace the deciduous teeth and are capable of grown-up biting and chewing. But it’s possible we could even grow a third set.

Some animals, such as sharks, have many rows of teeth that act as a kind of conveyor belt that replaces those that are lost. While humans are far from sharklike tooth factories, we do have something in common with our fishy friends: All of our teeth start out as buds, which are clusters of cells inside the jaw. And research has shown that humans have a third set of tooth buds, which scientists are hoping may lead to the potential for replacing lost teeth or teeth that never developed.

Tooth buds start to grow as soon as a baby is born.

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Tooth buds begin to form very early in embryonic development, around eight weeks gestation, and buds for all of a baby’s deciduous teeth are present before it is born. Some permanent teeth even start to form before birth.

Researchers at Japan’s University of Kyoto are hard at work developing a medication that could stimulate the growth of new teeth in humans. Their first study, conducted in mice, found that the presence of a certain protein could limit tooth growth. Preventing that protein from forming produced the opposite effect in rodents, allowing them to grow new teeth. 

The researchers are hopeful that human dental treatments using this method could be available by 2030. That means in the near future, tooth regrowth could become an option for dental care alongside dentures and dental implants.

Numbers Don't Lie

Numbers Don't Lie

Permanent teeth the average human has
32
Deciduous teeth the average human has
20
Percentage of your chewing that’s done with the molars (back teeth)
90%
Portion of the tooth made up of the root, which lies entirely below the gumline
2/3

The outer layer of your teeth, called ______, is the hardest substance in your body.

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The outer layer of your teeth, called enamel, is the hardest substance in your body.

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About 1% of humans have a condition that allows them to grow extra teeth.

Some people are able to grow more than the standard set of teeth — a condition known as hyperdontia. The current Guinness World Record holder for the most erupted teeth in a human mouth is Prathab Muniandy of Malaysia, who has 42 — 10 more than the average adult.

And in 2011, doctors documented a case of an 11-year-old girl whose dental X-ray showed 18 deciduous (baby) teeth, 32 permanent teeth, and 31 supernumerary (extra) teeth, for a grand total of 81. That makes for a lot of extra flossing!

Ali Eldridge
Writer

Ali Eldridge is a writer and editor based in Chicago. Currently the editor of "What on Earth! Magazine," she has also contributed extensively to Encyclopaedia Britannica and published several books for children. She spends much of her free time learning new languages and trading puns with her clever kid.