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Standing 29,032 feet above sea level in between Nepal and Tibet, Mount Everest is the world’s highest peak. It’s also still growing. While there’s a push-pull dynamic at work in its vertical expansion — plate tectonics push it further into the sky at the same time that erosion does the opposite — the mountain gets about 4 millimeters taller per year on average. That means it’s actually growing at a slightly slower rate than many of its Himalayan counterparts, some of which are rising about 10 millimeters each year.

Mount Everest is the tallest mountain in the world.

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Hawaii’s Mauna Kea is actually taller, but because more than half of its 33,500 feet are underwater, it reaches a much lower point above sea level. The volcanic mountain reaches an altitude of 13,802 feet above the Pacific, which still makes it an imposing peak in its own right.

At least 4,000 people have summited Mount Everest since 1953, although precise numbers vary depending on the source. It’s getting increasingly expensive to do so, however; the average cost in 2017 was about $45,000 per person, and some spend as much as $160,000 on travel, guides, food, and equipment. There are also growing concerns that expeditions up the mountain, which have increased in recent years, are having a negative impact. Both the crowds and the waste they leave behind degrade the mountain, and some have suggested it may be time to cease climbing the summit completely. Even so, adventurous spirits remain called to summit the highest peak on the planet — and will likely continue to feel that way for a long time to come.

Numbers Don't Lie

Numbers Don't Lie

Mountains in the world taller than 8,000 meters (26,247 feet)
14
People who have climbed all 14
44
Height (in feet) of Denali, the highest peak in North America
20,310
Countries the Himalayas pass through (China, Nepal, India, Pakistan, Bhutan, and Afghanistan)
6

The world’s second-highest mountain is ______.

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The world’s second-highest mountain is K2.

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George Everest didn’t want the mountain named after him.

Before it was Mount Everest, the world’s tallest peak was officially known as Peak XV for a time — and, if the mountain’s namesake had had his druthers, it might have stayed that way. Sir George Everest was Surveyor General of India from 1830 to 1843, during which time he helped survey the entire Indian subcontinent as part of the Great Trigonometrical Survey. It was for this and other accomplishments that his successor and former pupil, Andrew Scott Waugh, proposed renaming Peak XV (which he identified as the world’s highest peak in 1856 based on work by Indian mathematician Radhanath Sikdar) in Everest’s honor. Everest thought a local name would be more suitable, as his own last name couldn’t be written in Hindi and he had no actual involvement in the mountain’s discovery, but his objections went unheard. Funnily enough, he was more right than he knew about people having trouble with his name — it’s actually pronounced EEV-rest. (Meanwhile, the Tibetan name for the mountain is Chomolungma, or “Goddess Mother of the World,” while the Nepali name is Sagarmatha, or “Goddess of the Sky.”)

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 GarryKillian/ Shutterstock

Flamingos are some of the most striking birds on the planet. Their bright pink plumage is easy to spot in wetland habitats around the world, they eat upside down, and they can fall asleep standing on one leg — a task that’s impossible for most vertebrates. So how (and why) do flamingos pull off this impressive feat? For years, scientists believed it was because flamingos conserved heat by retracting their other leg into their body — similar to how a cat “loafs” to conserve warmth. However, this didn’t quite square with most birds’ physiology. So a study in 2017 went back to the proverbial drawing board, analyzed both dead and living flamingos, and discovered the answer has to do with some surprising physics.

Flamingos are pink because of mating displays.

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Flamingos are pink because of the food they eat. A flamingo’s diet involves a steady course of algae and small crustaceans, both filled with an orange pigment called beta carotene. Over time, this diet steadily turns flamingos from a dullish gray to a brilliant pink.

Scientists placed juvenile flamingos on what amounted to a highly sensitive bathroom scale to analyze the miniscule muscle movements in their legs and feet. When the birds slept on one leg, swaying decreased sevenfold compared to when they were standing or grooming on two legs. Scientists also realized that flamingos can passively lock their knee, which is located close to their trunk (the visible joint we see is actually their ankle), and then stabilize their center of gravity over this leg. Doing so doesn’t seem to require any conscious activity or muscle effort, as even dead flamingos were capable of doing it. The one-legged pose thus allows flamingos to expend less energy while they snooze — even if it looks a little unconventional.

Numbers Don't Lie

Numbers Don't Lie

Maximum wingspan (in feet) of the greater flamingo
5
Year the famous John Waters film “Pink Flamingos” was released
1972
Number of flamingo species, including the American flamingo
6
Approximate pounds of plastic transformed into flamingo lawn ornaments every year
270 million

A group of flamingos is called a ______.

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A group of flamingos is called a flamboyance.

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For more than a century, flamingos were considered an invasive species in Florida.

In the U.S., the American flamingo (Phoenicopterus ruber) is found almost exclusively in southern Florida — but for more than a century, the Sunshine State considered the bird an invasive species. Because of widespread hunting, flamingos stopped nesting in Florida at the turn of the 20th century. In the decades following, it was often assumed that any wild flamingos one spotted had escaped from captive colonies. However, research in 2018 using satellite trackers, aerial surveys, and historical reports (including accounts from 19th-century feather traders) concluded that the American flamingo is most likely originally native to southern Florida. This simple distinction carries big implications for the bird’s protection in the state, as well as protection of its wetland habitat. Today the Florida Fish and Wildlife Commission considers the American flamingo a native resident, but has declined to consider them “state threatened” in part due to their overall low population in Florida. That could change if these brilliant pink birds continue to return to their ancestral home.

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 Peter Ekvall/ Alamy Stock Photo

Decades before doctors began to publicize the harmful effects of cigarettes, a 30-year-old Austrian executive decided to invent a refreshing alternative. In 1927, Eduard Haas III was managing his family’s baking goods business — the Ed. Haas Company — when he expanded the product line to include round, peppermint-flavored treats known as PEZ Drops. The German word for peppermint is “pfefferminz,” and Haas found the name for his new candies by combining the first, middle, and last letters of the German term.

Clever advertising built national demand for the candy, which adopted its iconic brick shape in the 1930s and eventually nixed the “Drops.” They were marketed to adults with slogans like, “Smoking prohibited, PEZing allowed!” Originally, they were packaged in foil paper or metal tins until Haas hired engineer Oscar Uxa to devise a convenient way of extracting a tablet single-handedly. Uxa’s innovation — a plastic dispenser with a cap that tilted backward as springs pushed the candy forward — debuted at the 1949 Vienna Trade Fair. 

PEZ once came in a chlorophyll flavor.

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There are only a handful PEZ flavors available in the U.S., but other flavors are sold around the world — and still others have been discontinued. Among the flavors you can’t find anymore are liquorice, coffee, and, yes, chlorophyll.

A U.S. patent for the dispenser was obtained in 1952, but Americans of the day showed little interest in giving up smoking. So PEZ replaced the mint pellets with fruity ones and targeted a new demographic: children. In 1957, after experimenting with pricey dispensers shaped like robots, Santa Claus, and space guns, PEZ released a Halloween dispenser that featured a three-dimensional witch’s head atop a rectangular case. A Popeye version was licensed in 1958, and since then PEZ has gone on to produce some 1,500 different novelty-topped dispensers. An Austrian original that was revolutionized in America, PEZ is now enjoyed in more than 80 countries — and it’s still owned by the Ed. Haas Company.

Numbers Don't Lie

Numbers Don't Lie

Pressure (in pounds) the raw ingredients in PEZ undergo to become tablets
3,000
PEZ dispensers used to create the world’s largest PEZ dispenser sculpture, a replica of London’s Big Ben
9,404
Price a Prince Harry and Meghan Markle set of PEZ dispensers earned in a 2018 charity auction
$9,893
Minimum amount of individual PEZ candies eaten annually in the United States
3 billion

The all-time bestselling PEZ dispenser features ______.

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The all-time bestselling PEZ dispenser features Santa Claus.

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Hollywood almost made an animated PEZ movie.

The Lego Movie exceeded all box-office expectations by becoming the fourth-highest-grossing domestic film of 2014. Producers immediately started brainstorming about other nostalgia-inducing objects that could anchor an animated comedy. Envision Media Arts found a worthwhile property in PEZ, greenlighting a feature and hiring a screenwriter in 2015, yet no director or cast was ever announced. According to the Envision Media Arts website, “PEZ” remains in development, though it’s now listed as a TV show. In the meantime, anyone seeking a big-screen PEZ tribute can revisit the 1986 classic Stand by Me. In the Rob Reiner-directed film, 12-year-old Vern Tessio (Jerry O’Connell) contends, “If I could only have one food to eat for the rest of my life? That’s easy, PEZ. Cherry-flavor PEZ. No question about it.”

Jenna Marotta
Writer

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

Original photo by Buddy Mays/ Alamy Stock Photo

Many U.S. state flags have some strange quirks. The Virginia flag, for example, contains some tasteful nudity (thanks to its depiction of the famously bare-chested Amazons), and Maryland’s flag — a concoction of red crosses and black-and-yellow block patterns — looks more at home on a medieval battlefield than in 21st-century Annapolis. But Oregon has one of the most unusual state flags of them all. True, at first glance it looks relatively unremarkable: Emblazoned with the phrase “State of Oregon” on top and “1859” on the bottom, the blue-and-gold flag displays 33 stars, representing its admittance as the 33rd state in (you guessed it) 1859. These five-pointed stars encircle Oregon’s state seal, which features an ox and wagon traveling the Oregon Trail, while other natural elements including trees, mountains, and the Pacific can be seen in the distance. An eagle is perched atop the vignette for good, patriotic measure. 

Landlocked Paraguay has no navy.

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Although Paraguay has no coastline, the country has one of the largest navies of any landlocked country in the world. The navy operates on the nation’s lakes and rivers and patrols waterways for drug-smuggling and gang activity.

But what makes the flag stand out among all the other 49 state flags is that it has a separate image on the reverse side — a giant golden beaver, one of the state’s symbols and an important animal in Oregon’s history thanks to its role in the fur trade. Many flags used to have different images on the obverse (front) and reverse sides, but the cost and complexity of manufacturing two-sided flags led to an array of single-sided redesigns. Oregon became the last state with a two-sided flag after Massachusetts changed its banner in 1971. However, it shares some camaraderie with the South American country of Paraguay, the only nation in the world with a two-sided national flag. Based on the French tricolore but arranged horizontally, the obverse side of the flag features the country’s national coat of arms, while the reverse displays the seal of the treasury.

Numbers Don't Lie

Numbers Don't Lie

Estimated number of ghost towns in Oregon, more than any other U.S. state
200
Versions of the U.S. national flag that have existed since 1777
27
Year the “South Pass” through the Rocky Mountains was discovered, increasing migration to Oregon
1812
Possible number of beavers in pre-European North America
200 million

The only things on Alaska’s state flag are the ______ constellation and the North Star.

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The only things on Alaska’s state flag are the Big Dipper constellation and the North Star.

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No one knows for sure where the word “Oregon” originated.

The origin of the word “Oregon” is still a mystery, but not for lack of trying. Historians and linguists have offered up several possible solutions, though no definitive answer exists. The first reference to a similar word appears on a 1715 French map naming the Wisconsin River as “Ouaricon-sint.” The French also referred to the Columbia River, which borders northern Oregon, as “Le Fleuve aux Ouragans” (“Hurricane River”). Other theories for the origin of the term connect it to the herb oregano (although the reason for the link is unclear), Aragon (a French synonym for Spain), or a portmanteau of the Shoshone words ogwa, meaning “river,” and pe-on, meaning “west.” But the leading theory comes from a 1765 proposal to King George III from a colonial major named Robert Rogers, asking for funds to find the elusive Northwest Passage by means of exploring “the River called by the Indians Ouragon.” The word “ouragon” was likely derived from the Mohegan word wauregan, meaning “the beautiful.” Originally, the Mohegans, a tribe based in Connecticut, used the word to describe the Allegheny-Ohio River, but Rogers’ experience using Mohegans as troops during the French and Indian War (1754–1763) possibly influenced his description of a watery pathway to the Pacific, perhaps because he thought using a transplanted but “authentic” Indigenous name would strengthen his request for funds.

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 anilakkus/ iStock

The beloved film character Mary Poppins is known for sweetly singing that “a spoonful of sugar makes the medicine go down.” While it works wonders in the movie, the trick didn’t start with the fictitious nanny; healers, doctors, and pharmacists have relied on sugar to help patients choke down unsavory medications for thousands of years. But at one time, the sweet stuff wasn’t just an add-in — it was often the featured ingredient in healing remedies believed to cure all kinds of ailments. Sugar was used to treat sickness and injury as far back as the first century, when Middle Eastern practitioners prescribed it for dehydration, kidney issues, failing eyesight, and more. During the 11th century, English monks noted sugar’s ability to soothe upset stomachs and digestive issues, and by the Middle Ages doctors tried treating bubonic plague with concoctions of hemp, sugar, and more unpleasant ingredients. As recently as the 1700s, pharmacists recommended a glass of lemon juice and sugar water for asthma attacks.

Mary Poppins’ “A Spoonful of Sugar” was inspired by the polio vaccine.

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Disney’s 1964 film is known for its song urging sick children to palate bitter medicine, but the ditty takes its inspiration from children’s vaccines. Songwriter Richard Sherman penned the tune after hearing how his son received the oral polio immunization on a sugar cube.

Part of sugar’s allure — and perhaps perceived medicinal benefits — may have been connected to its former rarity. Some historians believe sugarcane originated in Southeast Asia, where farmers may have grown it as early as 8000 BCE, but refining began around 2,500 years ago in India — a process that made sugar shelf-stable and allowed it to spread to other regions. With far to travel, the sweetener was expensive by the time it reached medieval Europe, and for centuries was mostly reserved for the wealthy. But in 1747, German chemist Andreas Sigismund Marggraf discovered a way to produce sugar that didn’t require the sweltering climates in which sugarcane plants grow. Instead, sugar could be harvested in colder regions from the sugar beet, a root vegetable that grows in about three months. Over the next 100 years, sugar beet factories sprang up across Europe and then America, driving down the price of sugar and eventually giving people of all means a chance to savor a little sweetness — with their medicine or otherwise.

Numbers Don't Lie

Numbers Don't Lie

Amount of sugar (in pounds) the average American ate per year in colonial America
6
Amount of sugar (in pounds) eaten by the average American in 2019
57
Maximum weight (in pounds) of a mature sugar beet
5
Maximum height (in feet) of a mature sugarcane stalk
24

Sugar was once considered a ______, not a sweetener.

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Sugar was once considered a spice, not a sweetener.

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Sugar has been found in space.

Granulated, brown, powdered, pearl, cubed — there’s a lot of sugar on Earth. And surprisingly, there’s sugar in space, too. Researchers first discovered evidence of glycolaldehyde, a type of simple sugar, while looking for molecules in space that could support life. Glycolaldehyde is much less complex than cultivated Earth sugars, with only eight atoms compared to cane sugar’s 45. But when it’s found in space, researchers believe the stuff could play an important role in jump-starting life beyond our planet. That’s because glycolaldehyde can combine with a chemical called propenal to make ribose, a component of ribonucleic acid, which is similar to DNA and found in all living things. So far, glycolaldehyde has been found both in the interstellar gas cloud at the Milky Way’s center and in the gases surrounding a young star 400 light-years from Earth.

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 © Polina Kuzovkova/Unsplash.com

Brass fixtures have seen a resurgence in home design in recent years, especially in their natural, unlacquered form. But those warm, timeless decor pieces aren’t just stylish — they also happen to be natural germ fighters, a handy feature for surfaces our hands frequently come into contact with.

Brass is a durable metal known as an alloy, which means it’s made by combining different metals — in this case, copper and zinc. Copper has antimicrobial properties and can disinfect itself over time, and brass can too. This phenomenon is known as the oligodynamic effect; metals with this ability release ions that disrupt and kill bacteria and viruses.

Bacteria can double their population every 20 minutes.

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Under ideal conditions, a single bacterium can reproduce about every 20 minutes, and its exponential growth means one cell can turn into millions in just a few hours.

Studies have shown that, within as little as two hours, more than 99% of germs on copper and brass surfaces were gone. Within eight hours, 100% of previously detectable microbes were eliminated. That includes some of even the nastiest germs: MRSA and regular staph, which can cause deadly infections; VRE, a type of antibiotic-resistant bacteria; and E. coli, the foodborne troublemaker that can cause severe stomach illnesses. 

We should note that lacquered finishes block this property, so brass doorknobs, handles, or other fixtures must remain in their natural finish for the antimicrobial properties to work. Unlacquered brass is known to tarnish and get discolored, but since it doesn’t contain iron, it won’t rust, and it can easily be polished — a small tradeoff for fewer germs in the home.

Numbers Don't Lie

Numbers Don't Lie

Elements on the periodic table (as of 2026)
118
Bacteria in a liter of seawater
~1 billion
Melting point of brass (in degrees Fahrenheit)
~1710
Peak volume (in decibels) of a trombone, the loudest brass instrument
115

The most contagious disease is widely considered to be ______.

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The most contagious disease is widely considered to be measles.

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The total bacteria in your body weigh about as much as your brain.

Scientists once thought bacterial cells outnumbered human cells in our bodies by as much as 10:1. More recent estimates suggest the split is closer to even, so the human body contains roughly as many bacterial cells as human cells.

We have roughly 37 trillion cells in our bodies that act as foundations of our tissues, organs, and blood. By comparison, about 38 trillion microbial cells — bacteria, fungi, and viruses — live in and on our bodies. The vast majority of those are concentrated in the gut, where microbial densities are far higher than elsewhere in the body.

A stomach full of bacteria may sound troublesome, but those bacteria actually help break down food, produce essential nutrients, and support the immune system. The bacteria are collectively known as the microbiome, and they add up to weigh roughly 2 to 4 pounds — roughly the same weight range as the average human brain.

Nicole Villeneuve
Writer

Nicole is a writer, thrift store lover, and group-chat meme spammer based in Ontario, Canada.

Original photo by © bee32/iStock

Even among those who brush and floss every day, the human mouth isn’t exactly clean. It contains about 700 different kinds of microbes, including bacteria and fungi, some of which are helpful — but not so helpful that you’d ever want to be bitten by another person. Human bites are in fact even more dangerous than other animal bites, as they’re more likely to become infected as a result of that bacteria. Maybe all those zombie movies are onto something.

A dog’s mouth is cleaner than a human’s.

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This oft-repeated statement is little more than a popular misconception, most likely stemming from the fact that dogs lick their own wounds.

Health care providers treat roughly 250,000 human bites each year, around 10% of which result in an infection among children, who are more likely to be bitten than adults (usually by another child). Humans account for only 3% of all bites seen in emergency rooms, however. Dog bites are by far the most common, followed by those of cats, while bites from smaller animals such as mice, rabbits, and hamsters are more rare.

If any creature has put its teeth on you and broken the skin, you’re advised to seek medical treatment regardless of how cute the offending animal was — better safe than sorry.

Numbers Don't Lie

Numbers Don't Lie

Teeth an umbrella slug goes through in a lifetime
750,000
Bite force of a human (in pounds per square inch)
162
Fine paid by Mike Tyson after biting Evander Holyfield’s ear
$3 million
Deciduous (baby) teeth every human has
20

The animal with the strongest bite is the ______.

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The animal with the strongest bite is the Nile crocodile.

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Zombie folklore originated in Haiti.

Though we tend to think of them as cinematic creations, zombies predate motion pictures and can be traced back to Haitian folklore, which is itself rooted in African religious practices. According to the mythos, dead people can be brought back to life by voodoo sorcerers known as bokors.

The zombie (originally spelled “zombi”) was first written about in America in an 1838 article called “The Unknown Painter” published by the Alton Telegraph. In it, a person enslaved by the Spanish artist Bartolome Esteban Murillo claimed that a “zombi” made nightly appearances in Murillo’s studio to work on his apprentices’ paintings, a fantastical notion that was dismissed.

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 Kasturi Roy/ Unsplash

Ravens are smart — really smart. Studies have shown that they can use tools, remember human faces, and even plan for the future. This behavior cuts both ways for humans: Edgar Allan Poe’s favorite birds have demonstrated a tendency to both favor people who show them kindness and hold grudges against those who treat them poorly. These preferences aren’t fleeting, either — they may last for years.

Ravens (usually) mate for life.

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Like all corvids, ravens are referred to as socially monogamous. This means that mated pairs stick together for life. Other birds that do likewise include the bald eagle, black vulture, and whooping cranes.

Raven intelligence is comparable in some cases to that of chimpanzees, which are among the smartest members of the animal kingdom. What’s more, they aren’t the only ones upending the “bird brain” stereotype. Other members of the corvid family — namely crows, jays, and magpies — have displayed exceptional intelligence as well. So the next time you encounter a raven, be sure you get on its good side. You may make a new friend who won’t forget you anytime soon.

Numbers Don't Lie

Numbers Don't Lie

Life expectancy (in years) of a wild raven
10-15
Lines in Poe’s “The Raven”
108
Average wingspan (in inches) of an adult raven
46
Ravens belonging to Odin in Norse mythology
2

A group of ravens is called a(n) ______.

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A group of ravens is called a(n) unkindness.

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The Tower of London has a Ravenmaster.

English lore has long claimed that the kingdom will fall if ravens ever leave the Tower of London. With that in mind, it’s little surprise that the Ravenmaster has been an official — and important — position at the landmark since the 1960s. The current Ravenmaster, Barney Chandler, succeeded Christopher Skaife, who wrote a well-received memoir about his experiences tending to the clever birds, whose small stature belies the near-mythical status they occupy in England’s collective imagination.

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 IhorL/ Shutterstock

What’s the most boring day in history — a day where truly nothing important happened? That was the question posed in 2010 to a computer program named True Knowledge. Designed by computer scientist William Tunstall-Pedoe, the program contained 300 million facts, many of them tied to dates. After scouring those facts and comparing them to their respective dates, True Knowledge decided that April 11, 1954, was the most boring day in the 20th century. Belgium held a general election, some sports events happened, a coup in India was possibly planned but not carried out until two days later, and no notable births or deaths occurred — at least as far as the computer program could figure out. 

April is the wettest month in the U.S. overall.

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Although the phrase “April showers bring May flowers” seems to crown the month as a pretty soggy time of year, data suggests that the actual wettest month is usually June.

However, scientists may have some other days to suggest when it comes to the most boring day in history ever. The period from around 1.8 billion to 800 million years ago is known to geologists as “the Boring Billion,” because very little happened on Earth in terms of evolution, atmospheric chemistry, or geologic formation. Basically, it’s like the Earth was on pause for a billion years. It wasn’t until the Cambrian explosion some 530 million years ago, when most major animal groups started to appear in the fossil record, that things really started to get exciting. So chin up, April 11, 1954: You weren’t very interesting, but there’s at least a billion years that you easily beat. 

Numbers Don't Lie

Numbers Don't Lie

Registered voters in the April 11, 1954, Belgian general election
5.8 million
Number of studio albums released by Bob Dylan, who played his first major gig on April 11, 1961
40
Distance (in miles) of the R&D test tunnel dug by the Boring Company in California
1.14
Population of Boring, Oregon, according to the 2020 U.S. Census
1,931

According to a 2022 University of Essex study, the most boring job is ______.

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According to a 2022 University of Essex study, the most boring job is data analysis.

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Boredom may be good for your brain.

Today, boredom is under threat, with billions of smartphones bringing nearly limitless distraction to us worldwide. But while boredom may be uncomfortable, it can also be good for our brains. These precious moments of downtime give our brains a much-needed chance to rest, consolidate memories, and reflect on lessons learned throughout the day. Studies have shown that those who experience boredom spend more time thinking about their future, and boredom is also known to spur creativity as well as altruism. So the next time you’re feeling a mind-numbing sense of restlessness, don’t reach for your phone. Instead just let your mind wander — who knows what you’ll dream up?

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 deimagine/ iStock

Researchers estimate that some 300 million people around the world are colorblind, most of them male. On the opposite end of the spectrum are those with an exceedingly rare genetic condition that allows them to see nearly 100 million colors — or 100 times as many as the rest of us. It’s called tetrachromacy, or “super vision,” and it’s the result of having four types of cone cells in the retina rather than the usual three. (Cones help our eyes detect light and are key to color vision.) Because of the way the condition is passed down via the X chromosome, the mutation occurs exclusively in women.

Dogs see in black and white.

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While humans have three cones to detect light and color, dogs have two. They have trouble seeing red and green, but researchers think they can make out shades of blue and yellow.

One tetrachromat describes her ability this way: “If you and I look at a leaf, I may see magenta running around the outside of the leaf or turquoise in certain parts where you would just see dark green. Where the light is making shadows on the walls, I’m seeing violets and lavenders and turquoise. You’re just seeing gray.” In short, tetrachromats see colors within colors, and even the tiniest change in the color balance of a particular hue will be apparent to them. It's estimated that 12% of women have a fourth retina cone, but only a fraction of them experience tetrachromacy. In total, only about 1% of humans have the condition. The rest of us will just have to close our eyes and imagine what it’s like

Numbers Don't Lie

Numbers Don't Lie

Current number of Crayola colors
148
Americans who wear glasses
166.5 million
Percentage of women whose favorite color is purple
23%
Different colors on the world’s national flags
63

The world’s most common favorite color, according to a global survey, is ______.

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The world’s most common favorite color, according to a global survey, is blue.

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There are three types of heterochromia iridis, or different-colored eyes.

Complete heterochromia is when a person’s irises are each a different color — one blue and one green, for instance. Central heterochromia is when there’s an inner ring of color in the iris that’s different from the outer ring (usually in both eyes); the famous 1985 photo of “Afghan Girl” Sharbat Gula in National Geographic is likely an example. Segmental heterochromia is when a single iris has different colors in different parts, often as a patch or a triangle. Most of the time, heterochromia is a mere genetic quirk that doesn’t affect a person’s vision in the slightest. Some people are born with it, while others develop it later in life.

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.