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In most cities, Christmas comes once a year… unless you live in Santa Claus, Indiana, the self-proclaimed home of the holiday season and America’s first theme park: Santa Claus Land. While amusement parks have existed in the U.S. since the 1840s, at the beginning the general idea was just having fun. It wasn’t until 1946, with Santa Claus Land’s opening, that amusement parks began developing specific themes. The attraction took advantage of the town’s unique name, hoping to draw in visitors who wanted to experience a bit of holiday spirit any time of year, and especially youngsters keen to meet St. Nick himself. Owner Louis Koch, who built the theme park as a retirement project, planned the destination with children in mind; his original park featured a toy shop, doll displays, children’s rides, and a restaurant. Over time, Koch also added a mini circus, deer farm, wax museum, and live entertainment.

The world’s oldest operating roller coaster is on Coney Island.

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Altoona, Pennsylvania, is home to Leap-the-Dips, a wooden coaster constructed in 1902 that you can still ride today. The coaster ran for eight decades before it closed for restoration; it reopened in 1999 and continues to thrill visitors with downhill speeds of 10 miles per hour.

But Santa Claus Land’s biggest attraction was, of course, its namesake: Santa. Its Kris Kringle impersonators took the job seriously; the park’s longest-working Santa, Jim Yellig, wore the red-and-white suit for 38 years. During his tenure, Yellig reportedly heard more than 1 million holiday wishes from park visitors, an achievement that earned him induction into the International Santa Claus Hall of Fame in 2010. Santa Claus Land went through some upgrades around the time of Yellig’s retirement in 1984, adding on zones for Halloween, Thanksgiving, and the Fourth of July. Today, the park goes by the name Holiday World, and continues to welcome more than 1 million visitors each season.

Numbers Don't Lie

Numbers Don't Lie

Population of Santa Claus, Indiana, as of 2020
2,495
Height (in feet) of a granite Santa statue in Santa Claus, Indiana
22
Number of roller coasters at Holiday World
6
Pounds of Thanksgiving turkey baked each weekend at Holiday World
100+

Both Alaska and ______ have cities named North Pole.

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Both Alaska and New York have cities named North Pole.

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The U.S. Postal Service once considered renaming Santa Claus, Indiana.

The city of Santa Claus chose its holiday-inspired name in a bid to get its own post office, though at one point Congress considered renaming the town because it received too much mail. State lore says residents originally named the region Santa Fe, but another Indiana town had already claimed the title. To get a post office, the town had to choose a new name, leaving residents to somehow settle upon Santa Claus in the 1850s. As word got out about the unusual name, a deluge of Santa letters, holiday mail, and packages came to the city’s post office to be stamped with the Christmas-inspired postmark (especially after one kind postmaster began writing back to children who had sent letters to Santa, at his own expense). By 1931, the influx of mail overwhelmed the Postal Service, pushing Congress to consider renaming the town altogether — though legislators dropped the idea after residents argued in favor of the name. Today, the Santa Claus, Indiana, post office receives more than 400,000 pieces of mail in just December (compared to the normal 13,000 per month), all of which are processed with help from volunteers.

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 Pixel-Shot/ Shutterstock

The adult human body contains 206 bones, but that’s just a rough estimate. Biology doesn’t always follow the rules when humans — and other animals — grow from a clump of cells to full-fledged creatures. Even in generally healthy humans, this growing process can create a series of extra, or “supernumerary,” features. This can mean an extra rib, additional teeth, and yes, even an additional vertebra. This last one is particularly notable considering how central the spine is to a healthy, well-functioning body. According to scientists, about 10% of the population has an extra lumbar vertebra (known as L6).

A majority of animals have a spine.

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Although mammals, lizards, amphibians, birds, and nearly all fish have a spine, vertebrate animals make up only 5% of all species. A large percentage of invertebrate species are insects, which use exoskeletons instead of spines.

Lumbar vertebrae, the largest bones in the spinal column, protect the spinal cord — filled with tissues, cells, and nerves — while supporting the body’s weight and allowing for a wide range of motions. One might think that adding a sixth vertebra to the mix would mess with this delicate biological balancing act, but it turns out that our bodies are smarter than that. According to experts, the L6 vertebra has little to no impact on a person’s health — in fact, most people don’t even know they have one. Sometimes, an extra lumbar vertebra will fuse with the wrong bone, but an arguably greater concern is a doctor or surgeon identifying this extra L6 vertebra as the L5 vertebra, which can lead to medical mistakes known as “wrong-level” surgeries. So while it’s best to know if you’re the rare 1-in-10 case, it’s much more likely than not that your extra spinal bone won’t impact your life at all. 

Numbers Don't Lie

Numbers Don't Lie

Average length (in centimeters) of the vertebral column in Homo sapiens
66
Maximum weight (in ounces) of the hero shrew, which has one of nature’s strongest spines
4
Estimated number of spinal cord injuries in the U.S. every year
18,000
Estimated max percentage of the population born with an extra rib
1%

The smallest vertebrae in the spine are known as the ______ vertebrae.

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The smallest vertebrae in the spine are known as the cervical vertebrae.

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It’s technically impossible to be “double-jointed.”

Growing up, many people encounter that one friend who seems to be especially flexible — thumbs curve back, limbs jut out at awkward angles, and legs bend with unparalleled pliability. While this contortionist act is often said to be the result of being “double-jointed,” such a medical diagnosis doesn’t actually exist. Instead, a large portion of humanity is best described as having “hypermobility” or “joint laxity.” This means that some people are born with loose ligaments or other bone oddities that make them more flexible than most. For the majority, hyperflexibility isn’t harmful, but a small percentage — those with joint hypermobility syndrome — can experience pain. So in the end, all humans have the same number of joints, but as for the tautness of our ligaments? Well, that’s a different story.

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.

Credit: Brent Hofacker/ Shutterstock

The next time you take a sip of eggnog, you should know you’re indulging in a centuries-old tradition that traces back to medieval Britain. This sweet concoction — made from milk, cream, sugar, spices, and eggs — is the modern descendent of posset, a fixture of festive gatherings in the Middle Ages. Posset recipes vary, but most combine wine or beer with cream, sugar, and eggs, and are topped with a thick gruel made from bread, biscuits, oatmeal, or almond paste. To separate the drink from its rich topping, it was served in specialized “posset pots,” teapot-like vessels with two handles and a spout. These unique pots were passed around at English celebrations, particularly weddings, to toast prosperity and good health.

George Washington banned eggnog from his Mount Vernon estate.

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On the contrary, Washington seemed to embrace this tradition. Several eggnog recipes have been discovered at the estate, including one believed to be from Washington himself, which he reportedly served to guests. It includes eggs, sugar, salt, whipping cream, nutmeg, and bourbon.

Several centuries later, the drink made its way to the American colonies, where it became a hallmark of holiday festivities. Colonists added rum, making it more potent, which paved the way for the modern recipe as we know it. By 1775, the term “eggnog” was part of the American English vernacular. Etymologists pose two theories about its origin. The first suggests that “nog” comes from “noggin,” meaning a wooden cup, while others speculate it comes from “grog,” a strong beer. The origin of the word “posset” is more mysterious, possibly from the Latin word posca for a drink made of vinegar and water. The term endures to this day in the world of British baking, although it now refers to a cold cream-based dessert.

Numbers Don't Lie

Numbers Don't Lie

Gallons of eggnog consumed annually in the U.S.
15 million
Minimum proportion of egg yolks in store-bought eggnog
1%
Eggs a hen lays annually
~250
Year Starbucks’ eggnog latte debuted
1986

Often called “Puerto Rican eggnog,” ______ is a festive coconut milk-based drink.

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Often called “Puerto Rican eggnog,” coquito is a festive coconut milk-based drink.

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Spiked eggnog caused a “grog mutiny” at West Point.

The infamous “grog mutiny” at the United States Military Academy in West Point, New York, is an uncharacteristically unruly chapter in the highly esteemed institution’s history — and it all started with spiked eggnog. In 1826, West Point’s annual Christmas party erupted into chaos after Colonel Sylvanus Thayer, the superintendent, banned alcohol — including eggnog — from campus.

A group of defiant cadets boated up the Hudson River to gather whiskey from a nearby town, smuggling a few gallons onto campus by bribing a guard 35 cents for reentry. Mayhem ensued as eggnog-fueled cadets sought retribution by assaulting Captain Ethan Allen Hitchcock, the officer on duty during the party. As the revelers smashed windows, broke furniture, and even drew swords, Hitchcock barricaded himself in his room, calling upon the commandant for reinforcements. The mutiny eventually dispersed, but 19 cadets and one soldier were court-martialed for their involvement in the “eggnog riot” — a holiday rebellion that’s since been cemented into West Point lore.

Rachel Gresh
Writer

Rachel is a writer and period drama devotee who's probably hanging out at a local coffee shop somewhere in Washington, D.C.

Original photo by Maryna Auramchuk/ iStock

The human body is a story of resilience. Wounds heal, bones regenerate, and our immune system fights diseases and infections, yet few parts of the body experience as many challenges as our teeth. Capable of biting, tearing, and grinding, teeth are designed to withstand (almost) anything humans consume, and evolution has provided Homo sapiens some help in the form of tooth enamel. Formed from a mineral known as calcium phosphate and arranged in a crystal lattice “woven” with threads 50 nanometers across (1,000 times smaller than a human hair), enamel is the hardest substance in the human body. Its lifelong mission is to protect the innermost layers of the tooth, including the dentin and tooth pulp (which contains all those nerves that give you a toothache). 

Some people are born without wisdom teeth.

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Between 5% and 37% of people are born missing one or more wisdom teeth. A study in 2020 concluded that more babies are being born without these third molars, which could be an example of microevolution as humans lose the need for them.

A human’s extra-strength set of chompers is useful for eating everything from warm soup to rock candy, but teeth aren’t invincible. Modern diets (“modern” meaning after the agricultural revolution 10,000 years ago) are rich in carbohydrates, sucrose, and other sugars — much richer than what our hunter-gatherer ancestors experienced for hundreds of thousands of years. This new diet upset the well-balanced microbiome in our mouths, which are filled with around 700 kinds of bacteria. Some of these bacteria thrive on sugars, and left unchecked (i.e., without brushing, flossing, and regular dental visits), they attack enamel with lactic acid, a byproduct of the bacteria’s metabolism. So while enamel is the hardest stuff found throughout the human body, it needs extra special attention to keep all 32 teeth covered in it healthy and strong.

Numbers Don't Lie

Numbers Don't Lie

Percentage of U.S. citizens who are afraid to go to the dentist
36%
Number of years ago the first teeth evolved, in the throat of jawless fish during the Cambrian period
500 million
Number of days the average person will spend brushing their teeth during their lifetime
38.5
Number of teeth humans use during their lifetime — 20 baby teeth and 32 permanent teeth
52

The first known dentist is ______, a scribe from ancient Egypt’s third dynasty (2670-2613 BCE).

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The first known dentist is Hesy-Re, a scribe from ancient Egypt’s third dynasty (2670-2613 BCE).

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Snails have thousands of teeth.

Picture an animal sporting an impressive array of pearly whites, and something like a shark, whale, or lion might come to mind — but the humble snail outdoes them all. Depending on the species, snails have anywhere from 2,000 to 15,000 teeth in their pint-sized mouths. However, these teeth aren’t the same as the hardened enamel in our own jaws. Instead, a snail’s tongue (called a “radula”) is essentially covered in rows and rows of tiny teeth that act like a file when the gastropod is munching on a meal. Because this wears down the teeth over time, they’re regularly replaced. Yet some snail species also have incredibly tough teeth: The common limpet (Patella vulgata), for example, has teeth that are even stronger than spider silk, making them potentially the toughest biological material on the planet.

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 skynesher/ iStock

Soap is an everyday essential, but this incredibly useful (and lifesaving) cleanser hasn’t always existed. The earliest known mention of soap dates back 4,500 years, found on a cuneiform tablet unearthed from Girsu, in ancient Mesopotamia (modern Iraq). But even then — and for centuries afterward — humans likely weren’t using the slippery substance for handwashing. Bars of soap made from rendered fat and wood ash were primarily used to clean dirty clothing and raw fibers that were being prepped for weaving. Instead of soap, many ancient peoples (such as the Greeks) used scented olive oils and other substances — including coffee — to clean their bodies.

Soap and detergent are the same thing.

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The words “soap” and “detergent” are used interchangeably, but there is a difference. Soaps are made from oils or fats, and bond with dirt particles, making the latter slippery enough to slide away while washing. Detergents are made from dirt-removing enzymes, and don’t contain any soap.

Historians believe the practice of drinking coffee originated in Ethiopia and slowly spread to the Middle East and Europe, becoming popular around the 15th century. Before then, some cultures relied on the brew not as a beverage, but as a cleanser. Around the 10th century, physicians and botanists in the Middle East began writing in Arabic about “bunk,” a compound similar to modern brewed coffee that could be used for handwashing. Surviving texts from the time credited bunk with removing strong odors from hands without drying out the skin, and recipes for the substance sometimes included spices such as cloves, cinnamon, and fruit peels. Bunk also may have been incorporated into other products, like body oils and perfumed powders. However, little is known about the compound. It appears the practice fell out of popularity as coffee became valued less for its odor-eliminating properties and more for the same thing modern consumers appreciate: that caffeinating buzz.

Numbers Don't Lie

Numbers Don't Lie

Seconds the CDC recommends scrubbing your hands when handwashing
20
Year Purell, the gel-based hand sanitizer, became available in stores
1997
Estimated species of bacteria that live on human hands at any given time
150
Estimated cups of coffee consumed in the U.S. each day, as of 2023
440 million

The chemical process of creating soap is called ______.

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The chemical process of creating soap is called saponification.

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Soap carving was a popular hobby during the Great Depression.

How do you convince children to like soap? That was manufacturer Procter & Gamble’s big question in the early 1920s, when company executives were looking to draw in a younger demographic of shoppers. Believing that children familiar with the company’s Ivory soap would be future consumers, advertisers launched a marketing campaign that introduced the floating soap bars as art materials. In 1924, Procter & Gamble held its first National Soap Sculpture Competition, promoting the brand’s soap bars as the perfect medium for artistic carvings and awarding amateur artists with cash, trips, and other prizes. Soap carving exploded in popularity for more than a decade to follow, in part because of the Great Depression. Out-of-work Americans with more downtime sought out hands-on hobbies such as carpentry, gardening, and crafts — and with Ivory soap priced at just 25 cents for a six-pack (less than $5 today), soap carving became an inexpensive amusement.

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 loops7/ iStock

The English language is vast — so vast, in fact, that the average native speaker only knows about 6% of all English words, which equates to roughly 35,000 of the 600,000 words in the Oxford English Dictionary. That percentage may seem small, but the fact that most of us get by just fine on a daily basis suggests the other 94% of words are fairly obscure or redundant. English has one of the largest vocabularies of any language due to its history of freely incorporating words from other languages, particularly French (the origin of at least 30% of English words). Most adults learn an average of one new word per day until middle age, when vocabulary growth tends to slow or even stop — all the more reason to keep the mind sharp with crossword puzzles and word games.

English is the most widely spoken language in the world.

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Though Mandarin Chinese and Spanish have more native speakers, English takes the top spot when factoring in those who speak it as a second language.

Different studies have shown slightly different stats, of course. While one estimates the average English-speaking adult’s vocabulary somewhere between 20,000 and 35,000 words, another estimates it closer to 42,000. The latter study featured 70 real words alongside 30 made-up words and asked subjects to identify which was which; however, they weren’t required to define the words. This could account for the higher estimate of known words, as participants may have recognized some words without actually knowing their meanings.

Numbers Don't Lie

Numbers Don't Lie

Unique words in Shakespeare’s collected works
28,829
New words added to Merriam-Webster.com in 2024
200
Words in the Spanish language
~150,000
Average number of letters in an English word
4.5

Oxford’s 2023 word of the year was “______.”

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Oxford’s 2023 word of the year was “rizz.”

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The longest word in English has 45 letters.

You’ve probably never spoken the longest English word out loud, which is good for two reasons. The first is that pneumonoultramicroscopicsilicovolcanoconiosis clocks in at 45 letters and is exceedingly difficult to pronounce. The second is that it’s defined as “a lung disease caused by inhalation of very fine silicate or quartz dust,” which is to say that if you ever have occasion to speak it, it may not be a happy one.

To get even more technical, Merriam-Webster notes that the longest “string of letters used to describe something,” which isn’t a word but rather the chemical name of a protein, contains a staggering 189,819 letters and takes 50 pages to write in its entirety. (So you’ll excuse us not including it here.) It also takes more than three hours to pronounce, a feat that at least one person has actually accomplished.

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 Michael Wapp/ Alamy Stock Photo

Egypt's Library of Alexandria, possibly built around the fourth century BCE, was reputed to hold the wealth of humankind's accumulated knowledge in the ancient world. That makes "Alexa" an inspired choice for the name of the voice-activated virtual assistant that debuted with the Amazon Echo smart speaker in 2014. Yet this was hardly the only name strongly considered by Alexa's developers — nor even the favored choice of the company founder who pushed to bring the project to life. 

Alexander the Great founded the Library of Alexandria.

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Although the Macedonian conqueror founded, circa 330 BCE, the Egyptian city that bears his name, he died a few decades before the library was probably established.

As told in Brad Stone's Amazon Unbound: Jeff Bezos and the Invention of a Global Empire, the project's speech-science team had specific criteria for an appropriate "wake word," a vocal signal that would bring the virtual assistant to life. This word needed to have a distinct combination of phonemes — units of sound — and be at least three syllables, to diminish the likelihood of the program being accidentally triggered by everyday conversation. Bezos, the hands-on head honcho, offered several suggestions: "Finch," the title of Jeff VanderMeer's fantasy detective novel; "Friday," the helpful companion of Daniel DeFoe's Robinson Crusoe; and "Samantha," the enchantress played by Elizabeth Montgomery in the hit 1960s sitcom Bewitched. Bezos also came up with "Alexa," but seemed especially attached to "Amazon," reasoning that it could spark favorable feelings toward the company.

Despite the objections of his staff, Bezos clung to "Amazon" as a wake word until finally giving the go-ahead for the switch to "Alexa" a few weeks before the 2014 launch. As the company now proudly notes, the virtual assistant’s name "was inspired by the Library of Alexandria and is reflective of Alexa’s depth of knowledge." Yet certain Alexa-infused products offer the option of changing the wake word, reminiscent of that great learning center of antiquity, to one of a small list of replacements that still includes the choice of "Amazon."

Numbers Don't Lie

Numbers Don't Lie

“Skills” developed for Alexa to perform in the U.S. as of January 2021
80,111
Estimated number of scrolls stored in the Library of Alexandria
400,000-700,000
Smart home devices compatible with Alexa as of July 2020
100,000
U.S. babies given the name “Alexa” in 2022
574

Voice technologies like Alexa analyze human speech via a process known as ______.

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Voice technologies like Alexa analyze human speech via a process known as natural language understanding.

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The Library of Alexandria probably wasn’t destroyed by a great fire.

One of the enduring legends about the famed Library of Alexandria is that its priceless collection of manuscripts was tragically lost to a massive conflagration. However, modern researchers have serious doubts that such a catastrophic event ever happened. Roman Emperor Julius Caesar certainly was responsible for a fire during the 47-48 BCE siege of Alexandria, though evidence suggests that any damage to the library’s wares was done to books being temporarily stored in dockside warehouses. Citywide destruction also took place during a standoff between Roman and Palmyran forces circa 270 CE, and a temple complex housing the “daughter library” was wiped out late the following century, though it’s unclear whether this marked the end of the once-voluminous collection. So while war likely played a part, the consensus seems to be that the library simply underwent a slow demise over the course of centuries, through a failure to maintain the intellectual ambitions that once made it a world-renowned marvel.

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 Soft_Light/ iStock

The length of an average adult human neck ranges from about 4.5 inches to a bit more than 5 inches, while the longest human necks measure about 7.75 inches. In comparison, the average giraffe neck can reach up to 8 feet long. Despite this stark difference, humans and giraffes have an identical number of neck bones, with seven vertebrae apiece; in fact, most mammals have seven cervical vertebrae. These bones are located in the upper portion of the spine, and in humans, each measures around half an inch long. But in giraffes, those same bones can grow up to 12 inches long, resulting in their striking signature feature.

Wild giraffes sleep for as little as 30 minutes per day.

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Giraffes can get by on 30 minutes of daily sleep — among the shortest average sleep times in the animal kingdom. They also rarely lie down while sleeping, as that would make them vulnerable to predators. But giraffes in captivity act differently; they often sleep lying down for up to six hours.

Some research suggests giraffes may have an unofficial eighth neck vertebrae in the form of their first thoracic (chest) vertebra. In humans, this bone is considered a fixed part of the spine and has no impact on neck mobility. But for giraffes, the first thoracic vertebra is believed to act as a fulcrum, which allows their necks to have greater range of motion. If true, it could be argued that giraffes have eight neck bones in practice, even if their musculoskeletal structure only technically contains seven.

Nonmammalian species, meanwhile, have far more neck bones than humans and giraffes. In the avian world, ostriches have the longest neck of any living bird at around 3 feet. Their necks contain 17 cervical vertebrae, measuring a little more than 2 inches each. But in all of recorded history, the record for most neck bones belongs to the plesiosaur Albertonectes vanderveldei, which is thought to have had around 76 cervical vertebrae.

Numbers Don't Lie

Numbers Don't Lie

Height (in feet) of the tallest recorded giraffe
19
Distinct giraffe species, according to recent research
4
Weight (in pounds) of the average giraffe heart
25
Speed (in mph) the average giraffe can sprint
37

Among other terms including “tower” and “journey,” a group of giraffes is known as a “______.”

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Among other terms including “tower” and “journey,” a group of giraffes is known as a “kaleidoscope.”

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No two giraffes have the same spot pattern.

Much like human fingerprints, a giraffe’s spotted coat is unique to each creature, which allows researchers to easily identify individual giraffes. The different species of giraffe also have distinct spot styles. For example, reticulated giraffes have distinct brown spots separated by clear white lines. Masai giraffes, on the other hand, have a spot pattern that’s more oblong and jagged. But spots are used for more than just identification purposes. The brown and tan colors provide giraffes with natural camouflage in the savannah, and the spots are also used for thermoregulation, which is helpful given that giraffes don’t sweat. Each spot covers up a complex array of blood vessels that expand or contract depending on the surrounding temperature, allowing each giraffe to release and manage their body heat accordingly. In rare cases, giraffes can be born spotless, though this has only been recorded once in the wild and twice in zoos.

Bennett Kleinman
Staff Writer

Bennett Kleinman is a New York City-based staff writer for Optimism Media, 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 Peter Hermes Furian/ Shutterstock

Seeing into the future is supposed to be impossible. But if you travel to the Diomede Islands of the Bering Strait, the impossible becomes reality. The Diomedes consist of two remote islands, Big Diomede (part of Russia) and Little Diomede (part of Alaska). They’re only 2.4 miles apart, but the international date line runs in between them. That means that when you’re in the Alaskan fishing village of Little Diomede and looking at your Russian neighbor, you’re actually gazing into tomorrow. It’s no wonder these landmasses have been nicknamed the Yesterday and Tomorrow islands

For a few hours every day, three different days occur on Earth at the same time.

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Thanks to the quirks of the international date line and time zones, there are two hours a day when three days are happening at once. Because the date line curves to encompass Kiribati, part of the island nation has begun Wednesday while other spots in the world haven’t ended Monday.

Today, Big Diomede has no permanent population (except a few observation posts), whereas Little Diomede has a population of around 100 people, mostly Native Alaskans. Native people long passed freely between these two islands, even after the U.S. bought Alaska from Russia in 1867, but things changed with the Cold War. That’s when the “Ice Curtain” (a reference, of course, to the “Iron Curtain” of the Soviet era) came down between the two islands. Since then, travel between Big and Little Diomede has been strictly forbidden, even though ice in the winter forms a land bridge between them, making it theoretically possible to walk into the next day.

Numbers Don't Lie

Numbers Don't Lie

Years ago the Bering Land Bridge became submerged
12,000
Distance (in miles) of the U.S.-Canadian border, the longest border in the world
5,525
Amount (in USD) Russia sold Alaska for in 1867 (about $148 million today)
$7.2 million
Number of federally recognized tribes living in Alaska
229

When Secretary of State William Seward bought Alaska from Russia, the press called it “______.”

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When Secretary of State William Seward bought Alaska from Russia, the press called it “Seward’s Folly.”

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The U.S. has one ongoing territorial border dispute with Canada.

No matter how much you like your neighbor, you might have a few disagreements if your backyards share the largest land border in the world. Since April 11, 1908, the border between the U.S. and Canada has been a mostly settled issue, but one spot is still up for debate (on land, that is; other maritime disputes exist). Machias Seal Island, along northern Maine’s coast (or possibly New Brunswick’s coast), got stuck in a geographic “gray zone” when two separate documents essentially granted each country claim to the island. Although the place has an old Canadian lighthouse (Canada even makes sure to staff the lighthouse 24/7 for “sovereignty purposes”), the U.S. doesn’t recognize the land as Canadian. Luckily, this hasn’t escalated into too big of a deal, as it mostly only inconveniences lobster fishermen and tourists bird-watching puffins.

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 Just dance/ Shutterstock

“I feel like someone is watching me” is a classic horror film trope, but the idea also taps into a biological fact: Humans are good at sensing when someone is looking at them. While some label this gut feeling a kind of sixth sense, it’s really a biological phenomenon known as gaze detection, caused by a complex neural network in our brain. This detection system rests largely in our peripheral vision; the sense dissipates quickly when someone turns only a few degrees away from us. Because some 10 regions of the brain are involved with human vision, and little is known about gaze detection generally, scientists haven’t pinpointed what’s controlling this seemingly uncanny ability — although researchers have detected a dedicated group of gaze-detecting neurons in macaque monkeys.

Carrots are good for your eyes.

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You may have heard that carrots are good for your eyes. While this root vegetable won’t let you toss your prescription glasses, there is some truth to the idea. Carrots contain beta carotene and lutein, antioxidants known to prevent ocular damage by free radicals.

Gaze detection is particularly interesting in humans because our eyes are unlike any other in the animal kingdom. The area around the pupil, known as the sclera, is very prominent and white, which makes it easier to discern in what direction someone is looking. The overall theory as to why humans are so good at gaze detection boils down to the evolutionary advantage of cooperation. Simply put, humans are social creatures, and the detection of subtle eye movements helps us work with others while also helping us avoid potential threats. But because of the evolutionary importance of knowing when someone is looking at you, our brains tend to oversignal that someone is staring at us, when they’re really not. So if you’re ever feeling a bit paranoid, blame your brain.

Numbers Don't Lie

Numbers Don't Lie

Running time (in minutes) of 1896’s “Le Manoir du Diable,” the world’s first horror film
3
Release year of Rockwell’s hit single “Somebody’s Watching Me”
1984
Distance (in light-years) the James Webb Space Telescope can see
13.5 billion
Distance (in miles) that an eagle can see prey with 20/5 vision
2

Most people blink at least ______ times per minute.

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Most people blink at least 15 times per minute.

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Humans have a “sixth sense” called proprioception.

We’re all familiar with the supposed five senses — smell, taste, touch, sight, and hearing — but humans have far more senses than that. One of them is called proprioception, a sense that helps our brain interpret where we are in space. This sense is derived from small receptors (called “piezo2” receptors) located in our skeletal muscles and tendons, which act as a kind of gateway through which mechanical motion enters the nervous system and gives our brains a sense of spatial awareness. Proprioception is what allows you to meander through a pitch-dark room and still have a sense of yourself occupying a particular space; if asked, you could touch your nose, hop on one foot, or do other tasks even though you can’t see. This sense isn’t as easily understandable as the basic five, but it’s a big deal if you’re missing these crucial receptors. In 2019, Vox spoke with someone missing this sixth sense, and she said that when the lights go out, it’s as if “you had a blindfold and somebody turned you several times, and then you’re asked to go in a direction.” So while the human body does an incredible job mapping the world with its five senses, there’s a lot more going on than you may realize.

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.