Original photo by ilbusca/ iStock

For about 37 years of its history, the U.S. has been without a second-in-command. Before the passage of the 25th Amendment in 1967, there was no procedure for filling the role if a commander in chief died in office. Instead, there just wasn’t a VP if that happened — at least not until the next presidential election. Thanks to this legislative quirk, John Tyler, Millard Fillmore, Andrew Johnson, and Chester Arthur (all VPs under a President who died in office) served their entire presidential terms without a Vice President. 

National elections are held on Tuesdays in early November thanks to 19th-century farmers.

Ready to reveal?

Oops, incorrect!

It's a fact

When the U.S. came up with a nationwide voting day in 1845, they picked November — a month when farmers were done harvesting but before winter set in. Tuesday allowed farmers (who often had long trips to polling sites) to go to church on Sunday and to market day on Wednesday.

Other Presidents have gone without VPs for at least part of their terms, whether through resignation (two) or because their veeps died in office (seven). The first VP vacancy occurred in 1812, when George Clinton, President James Madison’s running mate, died in office. Strangely, Madison’s VP pick for his second term also died in office, after serving only about 20 months. The last executive shuffle occurred during the Nixon administration in 1973–74, when Spiro Agnew and Richard Nixon both resigned (Agnew about nine months before Nixon, amid tax evasion and corruption charges). Nixon nominated Gerald Ford to replace Agnew, and after Nixon himself resigned in August 1974 following the Watergate scandal, Ford became the first and only President never elected by the U.S. people. Ford left the vice presidency vacant for several months until Nelson Rockefeller finally filled the position on December 19, 1974. Since then, the U.S. has never been without a veep.

Numbers Don't Lie

Numbers Don't Lie

Number of Vice Presidents who became President of the United States
15
Year Walter Mondale moved into official VP residence Number One Observatory Circle (the first VP to do so)
1977
Number of VPs who’ve won the Nobel Peace Prize
3
Number of episodes of HBO’s “Veep,” starring Julia Louis-Dreyfus as fictional VP Selina Meyer
65

The political term “gerrymandering” is named for fifth Vice President ______.

Ready to reveal?

Confirm your email to play the next question?

The political term “gerrymandering” is named for fifth Vice President Elbridge Gerry.

Placeholder Image

The vice presidency used to be a consolation prize.

We’re used to seeing a presidential ticket featuring one person aiming for the top job and their running mate, but for the first three U.S. administrations, that wasn’t how things worked. In the beginning, the vice presidency was given to the candidate who came in second in the presidential election. During the nation’s first election, in 1789, electors (members of the Electoral College) voted for two people to be President. General George Washington received 69 votes, but fellow founding father John Adams received 34, enough to secure the second-place spot and, in turn, the vice presidency. But pretty quickly — and especially as U.S. political parties began to form — this system displayed a fatal flaw: It forced men who had been bitter rivals to work right next to each other. In 1796, Thomas Jefferson became Adams’ Vice President after tallying the second-most votes, but the two were from opposing parties (with Adams a Federalist and Jefferson a Democratic-Republican). By 1803, Congress had become convinced that the vice presidency needed a tweak, which came in the form of the 12th Amendment — a change that allowed electors to cast a separate vote for President and Vice President, which ensured that both leaders came from the same party.

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 ArisSu/ iStock

The animal kingdom is full of incredible variety, thanks to evolution, but one thing most animals have in common is that they use a set of eyes to navigate the world around them. But even the pupil of the eyeball, the biological aperture responsible for how much light enters the eyes, is nearly as diverse as the types of birds that soar the skies or fish that swim the seas.

Humans can’t keep their eyes open when they sneeze.

Ready to reveal?

Oops, incorrect!

It's a fib

Most people experience an automatic response to close their eyes when sneezing, but it is possible to keep them open (your eyes won’t pop out either). Scientists think the response keeps irritants, which the sneeze just expelled, from re-entering the body through the eyes.

For mammals, one big factor determining the shape of a pupil is whether the creature is predator or prey. For example, a goat is a grazing prey animal that would be a pretty easy target for coyotes, bears, and other predators with sharp teeth. Yet evolution gave the goat a few tools to defend itself. The horns certainly help, but the biggest advantage is a goat’s horizontal rectangular pupils. These long, horizontal pupils create a panoramic view that lets the animal see more of the landscape, which makes it harder to sneak up on them. The pupils also enhance the image quality of objects (read: threats) all around the goats, and they cut down on glare from the sky by capturing less light from above and more from below. Cats and snakes, on the other hand, are ambush predators, whose vertical pupils help them hunt in the night and judge the distance between themselves and their next meal. But according to scientists, vertical pupils are reserved only for animals whose eyes are close to the ground. That’s why other cats that are higher up, like lions and tigers, have round pupils rather than vertical ones.

Numbers Don't Lie

Numbers Don't Lie

Years ago the first animals with eyes appeared on the planet
550 million
Maximum size (in millimeters) of the human pupil in the dark (at full dilation)
8
Approximate year the first goats were domesticated, in western Iran
8000 BCE
Height (in feet) a mountain goat can jump in a single bound
12

The first use of the acronym GOAT (Greatest Of All Time) was in reference to ______.

Ready to reveal?

Confirm your email to play the next question?

The first use of the acronym GOAT (Greatest Of All Time) was in reference to Muhammad Ali.

Placeholder Image

Goats have accents.

A 2012 study from Queen Mary University of London revealed that kids (the goat kind, not the human kind) altered their bleating when socializing with other goats. The ability to change one’s voice in response to a social environment is known as “vocal plasticity,” and humans display an extreme form of this concept — it’s how we can develop accents. Goats develop similarly distinct accents based on their social group, admittedly with a more limited vocabulary. In the study, scientists analyzed one-week-old goats compared to five-week-old goats; the latter is about the time goats form social groups known as “crèches.” They found that young goats raised in the same crèches developed similar bleats, altering their noises to fit in their social group as they aged. It’s also possible these accents help goats identify members of their group, an idea familiar to anybody who’s traveled outside their home country — or even their hometown.

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 Rui Serra Maia/ Shutterstock

The American West is known for its wide open spaces, but nowhere is quite as wide open as the area around Glasgow, Montana. Crunching some numbers back in 2018 in an effort to definitively define “the middle of nowhere,” The Washington Post found that a whopping 98% of Americans in the contiguous U.S. live within an hour of some kind of urban center (that is, a metropolitan area with at least 75,000 people). But Glasgow, located in the northeast corner of the state, is an estimated 4.5 hours from the nearest urban center, making it the most isolated town (with a population of 1,000 or more) in the Lower 48. 

Glasgow, Montana, was named by spinning a globe.

Ready to reveal?

Oops, incorrect!

It's a fact

Though you might think that Glasgow has an intimate connection with Scotland, the isolated Montana town, previously named “Siding 45,” was actually named randomly after a railroad clerk spun a globe and his finger landed on the Scottish city.

Glasgow was founded in 1887 as a railroad town, and during World War II was home to the Glasgow Army Airfield, which eventually transformed into the Glasgow Valley County Airport. After a nearby Air Force base left town in the late ’60s, Glasgow’s population settled around 3,000. Although it’s now the most remote town on the mainland, many towns in Alaska rival Glasgow’s “middle of nowhere” claim when it comes to the nation as a whole. Utqiagvik, formerly known as Barrow, is the U.S.’s northernmost city, is only accessible by plane, and is 500 miles away from Fairbanks. In other words, Alaska takes the idea of “wide open spaces” to a whole new level. 

Numbers Don't Lie

Numbers Don't Lie

Estimated year when St. Kentigern established a religious community in present-day Glasgow, Scotland
550 CE
Year Montana joined the union as the 41st state
1889
Distance (in miles) of Pitcairn Island from New Zealand, one of the most remote inhabited islands in the world
3,240
Population of the state of Montana, according to the 2020 census
1,084,225

The farthest spot from land is called ______, after a character in “Twenty Thousand Leagues Under the Seas.”

Ready to reveal?

Confirm your email to play the next question?

The farthest spot from land is called Point Nemo, after a character in “Twenty Thousand Leagues Under the Seas.”

Placeholder Image

The object farthest from the sun in our solar system is called Farfarout.

Things don’t get much more isolated than the trans-Neptunian object (TNO) Farfarout — so named because it’s the farthest known object in our solar system. With the technical name 2018 AG37, Farfarout takes an entire millennium to complete its orbit around the sun; it’s an average of 132 astronomical units (AU) away from our host star. With one AU equaling the distance between Earth and the sun (about 93 million miles), Farfarout is true to its name. However, depending on where it is in its orbit, Farfarout can be up to 175 AU away or as close as 27 AU, which is about as near as Neptune. While astronomers found this far-flung celestial body searching for “Planet X” — an unknown, hypothesized planet somewhere beyond the orbit of Neptune (sorry, Pluto) — Farfarout puts the “dwarf” in dwarf planet, as it stretches only about 250 miles across.

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 scyther5/ iStock

Our diversity is part of what makes human beings special. Yet as far as our genes are concerned, we’re all fairly similar: Humans share 99.9% of their genes with one another. To put this into perspective, bonobos and chimpanzees — the closest relatives to humans in the animal kingdom — share approximately 98.8% of their genes with humans. Clearly, even small differences in genetic similarity can have a major impact. 

Modern humans still have traces of DNA from other human species.

Ready to reveal?

Oops, incorrect!

It's a fact

Some 70,000 years ago, at least four species of humans coexisted on Earth — Homo sapiens, Neanderthals, Homo floresiensis, and Denisovans. Evidence of this coexistence can be found in human genetics, with small percentages of Neanderthal and Denisovan DNA embedded in our genes.

That may be especially true when it comes to human health. According to the National Institutes of Health, nine of the 10 leading causes of death in the U.S. (barring accidental deaths) are influenced by our genetics, and variations among individuals can mean significantly varying health outcomes. 

In the 21st century, advances in our understanding of the human genome — thanks to the completion of groundbreaking scientific studies including the Human Genome Project — have pushed medicine into the genetic frontier. Now doctors can screen newborns for genetic abnormalities and sometimes use gene-based therapies, while nutritionists are using genomics to tailor diets to specific genetic dispositions. According to some, the future of medicine is in our genes.

Numbers Don't Lie

Numbers Don't Lie

Estimated number of human genes (by one count)
20,000
Number of people who had their DNA sequenced by 23andMe as of 2022
12 million
Year the Human Genome Project (mostly) finished sequencing the human genome
2003
Distance (in miles) a person’s DNA would stretch if unwound and linked together
110 billion

The ancestor of all life is a single-celled organism called ______.

Ready to reveal?

Confirm your email to play the next question?

The ancestor of all life is a single-celled organism called Luca (Last Universal Common Ancestor).

Placeholder Image

The woman who discovered DNA’s double helix was denied the Nobel Prize.

Photo 51 is one of the most famous images in science history. Taken by British chemist Rosalind Franklin in 1952, the image revealed the now-famous double helix structure of deoxyribonucleic acid (DNA). The photo was shared with scientists Francis Crick and James Watson at the Cavendish Laboratory, likely without Franklin’s knowledge. In 1953, the two scientists, along with Franklin’s colleague Maurice Wilkins, published their DNA work alongside Franklin’s photo without crediting her. A decade later, the three scientists received the Nobel Prize — and Franklin was once again neglected. (Sadly, she had died in 1958 of ovarian cancer.) Thankfully, in the decades since, the scientific community has honored Franklin’s contribution to science. In 2019, the European Space Agency even named its new Mars rover the Rosalind Franklin.

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 Tim Bish/ Unsplash

The human body has 206 bones — unless you’re talking about babies, in which case the number is closer to 300. Many of a newborn’s bones are actually made of cartilage, which is much more malleable and allows fetuses to curl inside the womb as they develop. As children grow, cartilage turns into bone in a process called ossification, and the excess bones fuse together. (If you’ve ever wondered how those “soft spots” on an infant’s head — technically known as fontanelles — become stronger, bone fusion is the answer.) This is also a big part of why calcium is so important for babies: New bone tissue can’t grow without it.

Newborns don’t cry tears.

Ready to reveal?

Oops, incorrect!

It's a fact

For the first weeks of their life, babies don’t technically cry. They may make a lot of noise when expressing their displeasure, but because tear ducts don't fully form for a month or so, their eyes will remain dry while they do so.

Ossification doesn’t happen overnight, however — it continues until a person reaches their mid-20s, which is around when humans reach their peak bone mass. In much the same way that we’re constantly shedding our skin, our bones are constantly changing as well, with old bone gradually destroyed and new bone material formed. The process is called remodeling, and it helps keep the skeletal system healthy long after we’ve settled down at 206 bones.

Numbers Don't Lie

Numbers Don't Lie

Babies born worldwide every minute
250
Bones in the human foot
26
Most babies born to a mother at once
9
Pounds of compressive force the adult male femur can support
6,000

The smallest bone in the human body is the ______.

Ready to reveal?

Confirm your email to play the next question?

The smallest bone in the human body is the stapes.

Placeholder Image

Humans and giraffes have the same number of neck bones.

Despite having the longest necks in the animal kingdom — they can reach a length of 8 feet, twice as long as the neck of any other creature — giraffes have the same number of cervical vertebrae as humans: seven. The key difference is that giraffes’ vertebrae are much longer, with each of them measuring close to 10 inches in length; in humans, the entire vertebral column is around 28 inches for men and 24 inches for women. We have the same number of neck bones as our tall, spotted friends for the simple reason that we’re both mammals — sloths and manatees are the only members of this particular class that don’t have seven.

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 Africa Studio/ Shutterstock

Mentions of radioactivity can send the mind in a dramatic direction, but many ordinary items are technically radioactive — including the humble banana. Radioactivity occurs when elements decay, and for bananas, this radioactivity comes from a potassium isotope called K-40. Although it makes up only 0.012% of the atoms found in potassium, K-40 can spontaneously decay, which releases beta and gamma radiation. That amount of radiation is harmless in one banana, but a truckload of bananas has been known to fool radiation detectors designed to sniff out nuclear weapons. In fact, bananas are so well known for their radioactive properties that there’s even an informal radiation measurement named the Banana Equivalent Dose, or BED. 

Bananas have more potassium than any other food.

Ready to reveal?

Oops, incorrect!

It's a fib

One of the most ubiquitous facts about bananas is that they’re loaded with potassium. While the berry (yes, a banana is a berry) has a good amount of potassium, many other foods provide more milligrams of the stuff, including lima beans, spinach, potatoes, and avocados.

So does this mean bananas are unhealthy? Well… no. The human body always stores roughly 16 mg of K-40, which technically makes humans 280 times more radioactive than your average banana. Although bananas do introduce more of this radioactive isotope, the body keeps potassium in balance (or homeostasis), and your metabolism excretes any excess potassium. Oh, and in case you were wondering, a person would have to eat many millions of bananas in one sitting to get a lethal dose (at which point you’d likely have lots of other problems). So go ahead and eat that banana cream pie — you can leave the Geiger counter at home.

Numbers Don't Lie

Numbers Don't Lie

Tons of Cavendish bananas produced every year, making it by far the most popular type
50 billion
Time (in seconds, equal to 2:41:27) of the fastest marathon ever completed by a runner wearing a banana suit
9,687
Year the flash animation “Peanut Butter Jelly Time,” featuring a dancing banana, first appeared online
2002
Species of bananas
1,000+

______ grows more bananas than any other country, producing more than a quarter of the world’s total.

Ready to reveal?

Confirm your email to play the next question?

India grows more bananas than any other country, producing more than a quarter of the world’s total.

Placeholder Image

Scientists have measured the slipperiness of a banana peel.

Slipping on a banana peel is one of the world’s oldest jokes, but it’s also based on some solid physics. In 2011, researchers from Kitasato University in Tokyo analyzed the slipperiness of banana peels compared to orange and apple peels. Without a doubt, bananas were the slipperiest, due to polysaccharide follicular gels that spill out when the peels are crushed (or stepped on). These same chemicals are found in membranes where human bones meet, and further research on them could lead to better prosthetics. Not content with just taking a scientist’s word for it, Twitter users in 2016 created the viral Banana Peel Challenge, which provided even more qualitative data proving the devilish slipperiness of the banana peel.

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 Nitr/ Shutterstock

You’ve probably heard people say things like “I’ll be there in a jiffy,” using “jiffy” to mean a very short period of time — something like the blink of an eye. But it may surprise you to learn that for some scientists, the term has a more precise definition. That definition varies depending on who’s doing the talking: The physical chemist Gilbert Newton Lewis (1875–1946) defined a jiffy as the length of time it takes for light to travel 1 centimeter in a vacuum. However, some physicists have defined a jiffy as the time it takes light to travel 1 femtometer — one-millionth of a millionth of a millimeter. By this account, each second contains roughly three hundred thousand billion billion jiffys.

Ancient Egyptians created today’s 60-minute hour.

Ready to reveal?

Oops, incorrect!

It's a fib

We owe a lot to ancient Egyptians for dividing time into something close to our own clocks and calendars. However, they divided the day and night into 12 hours each, which varied from 45 to 75 minutes long, depending on the season. Our 60-minute hour comes from the Babylonians.

But a jiffy has also been defined outside of physics and chemistry. An electrical engineer, for example, might describe a jiffy as the time it takes for a single cycle of alternating current, which is one-fiftieth or one-sixtieth of a second depending on the electrical system. Whatever definition holds true, one thing is certain — no one in the history of the world has ever truly accomplished much “in a jiffy.”

Numbers Don't Lie

Numbers Don't Lie

Minimum number of years the world’s oldest clock, at Salisbury Cathedral, has kept time
637
Year Jiffy Lube was founded, in Utah
1971
Number of “atoms” — an Old English measurement — in a minute
376
Approximate year that the word “jiffy” entered the English lexicon
1785

A leading theory suggests that “jiffy” was originally slang for a ______.

Ready to reveal?

Confirm your email to play the next question?

A leading theory suggests that “jiffy” was originally slang for a flash of lightning.

Placeholder Image

Technically, a second is not 1/60 of a minute.

It’s forgivable to think a second is one-sixtieth of a minute (or 1/86,400 of a day). After all, it’s pretty prominently displayed on every clock and watch ever built. But time isn’t nearly as neat as our timekeeping devices make it out to be. The universe is full of astronomical quirks, and for scientific purposes a second needs to be much more precise than a simple fraction. That’s why, in 1967, scientists changed the official definition of a second from 1/86,400 of a day to “the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.” This is the basic principle behind atomic clocks, super-accurate instruments that use atomic physics to maintain long-lasting accuracy. For some state-of-the-art devices, it would take 15 billion years for the clock to be off by one second.

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 Sueddeutsche Zeitung Photo/ Alamy Stock Photo

Before founding the animation studio that bears his name, Walt Disney was a commercial artist in Kansas City, Missouri. It was there, around 1919, that he began making hand-drawn cel animations of his own, which were screened in a local theater and dubbed “Laugh-O-Grams.” The studio he acquired following his cartoons’ success had the same moniker, but it was a short-lived venture — Laugh-O-Gram’s seven-minute fairy tales and other works were popular with audiences, but financial troubles forced Disney to declare bankruptcy in 1923.

Walt Disney was cryogenically frozen.

Ready to reveal?

Oops, incorrect!

It's a fib

Intriguing though it may be to think otherwise, “Disney on Ice” is just a show. Not unlike Elvis still being alive and Paul McCartney being replaced by a look-alike, this odd urban legend has persisted for decades despite being based on nothing more than tabloid rumors.

Disney, his brother Roy, and cartoonist Ub Iwerks moved to Hollywood the same year and founded Disney Brothers Cartoon Studio, which quickly changed its name to Walt Disney Studios at Roy’s behest. Had it not been for Laugh-O-Gram, however, it’s likely that Disney’s most famous creation would never have been born. The inspiration for Mickey Mouse came from a brown mouse who frequented his Kansas City studio trash basket — a “timid little guy” Disney was so fond of that before leaving for Hollywood, he “carefully carried him to a backyard, making sure it was a nice neighborhood,” at which point “the tame little fellow scampered to freedom.”

Numbers Don't Lie

Numbers Don't Lie

Academy Awards won by Walt Disney, the most of any individual
26
Box-office gross of “Frozen II,” Disney’s highest-grossing animated film
$1.45 billion
Disney Parks around the world
12
Feature films produced by Walt Disney Animation Studios
63

Mickey Mouse’s original name was ______.

Ready to reveal?

Confirm your email to play the next question?

Mickey Mouse’s original name was Mortimer Mouse.

Placeholder Image

Walt Disney was the original voice of Mickey Mouse.

For the first 20 years of his existence, Mickey Mouse was voiced by none other than Walt Disney himself. The world was introduced to Mickey in 1928’s animated short Steamboat Willie, though Disney produced two prior shorts featuring Mickey that same year, Plane Crazy and Gallopin’ Gaucho, which weren’t picked up by distributors. Steamboat was the first of these to feature sound, though Mickey didn’t utter his first actual words (“Hot dogs!”) until the following year’s The Karnival Kid. The last regular short Disney lent his vocal talents to was 1947’s Fun and Fancy Free, though 2013’s Get a Horse! patched together previous recordings to once again feature him as the voice of his most famous creation.

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 PeopleImages/ iStock

Gravity is an essential force on Earth: It keeps the planet in orbit at a safe and comfortable distance from the sun, and even holds our atmosphere in place. It does have a downside, however: It weighs down the human body, making us a tiny bit shorter by the end of the day. From the moment we climb out of bed in the morning, gravitational forces push down on us, applying downward pressure on our joints, compressing our spines, and causing our organs to settle. All that strain adds up, enough to shrink a body by 1 centimeter. Gravity is at work whether we’re sitting or standing, but at bedtime, our bodies get a slight reprieve as lying down redirects the force. Sleeping horizontally gives our spines and joints time to decompress and gain back the height lost during the day, making us once again slightly taller by morning. 

Children have more vertebrae than adults.

Ready to reveal?

Oops, incorrect!

It's a fact

At birth, humans tend to have 33 vertebrae — the individual bones that make up the spinal column. By adulthood, many of those bones have completed the normal process of fusing together, leaving the average adult with just 24 vertebrae.

Even though this ebb and flow is a normal process our bodies endure, over time humans tend to shrink in stature. The human body constantly breaks down and replenishes its bones to keep them healthy, though by age 35, that process tends to slow, with bones breaking down faster than they rebuild. The aging process also causes the cushions between our bones to retain less water and deteriorate, which makes the bones settle together. These processes slowly chip away a few millimeters of height at a time, which can eventually add up — on average, men tend to lose an inch of height between 30 and 70 years old, while women can lose up to 2 inches.

Numbers Don't Lie

Numbers Don't Lie

Estimated number of genes that impact a person’s height
12,000+
Average number of inches children grow per year after age 2
2.5
Height (in feet) of Robert Wadlow, the world’s tallest man ever
8’11”
Approximate height (in feet) of Afshin Ghaderzadeh, world’s shortest living man
2’1”

On average, the world’s tallest people are from ______.

Ready to reveal?

Confirm your email to play the next question?

On average, the world’s tallest people are from the Netherlands.

Placeholder Image

Astronauts get taller in space.

Most people reach their maximum height by early adulthood — unless they’re astronauts. That’s because scientists who rocket into space for extended periods tend to grow about 3% taller during their time off Earth. In astronaut Scott Kelly’s case, a 340-day trip aboard the International Space Station gave him the souvenir of around 2 additional inches of height. NASA research on astronaut bodies shows that while in space, the spine’s vertebrae decompress and relax, giving space explorers the benefit of added height. However, that increase in statute is temporary; once back on Earth, the planet’s gravitational forces are back in play, causing those extra inches to disappear.

Interesting Facts
Editorial

Interesting Facts writers have been seen in Popular Mechanics, Mental Floss, A+E Networks, and more. They’re fascinated by history, science, food, culture, and the world around them.

Original photo by sharpner/ iStock/ Getty Images Plus

Aside from long blond hair, horned helmets are probably the most famous Viking accessory — but that would have been a surprise to the real Scandinavian warriors who plundered Europe between the 9th and 11th centuries. The Viking horned helmet convention dates only to the 19th century: In 1876, costume designer Carl Emil Doepler introduced it in Richard Wagner’s famous opera "Der Ring des Nibelungen" ("The Ring of the Nibelung," often called the Ring Cycle). At the time, Germans were fascinated with the story of the Vikings, so Doepler plopped the ancient headdress of the Germans — the horned helmet — on Wagner’s Viking protagonists. The opera proved so popular that by 1900 the horned helmet was inextricably entwined with Vikings themselves, appearing in art, ads, and literature.

Bluetooth technology is named after a Viking king.

Ready to reveal?

Oops, incorrect!

It's a fact

Bluetooth is named after Viking king Harald Gormsson, known for a dead (“blue”) tooth. But why? “[He] was famous for uniting Scandinavia just as we intended to unite the PC and cellular industries with a short-range wireless link,” Intel’s Jim Kardach has said.

Yet during the Viking era, Norse warriors never actually wore horned helmets — and especially not during battle, where they’d probably have gotten in the way. Some artifacts, such as a tapestry discovered with the famous Oseberg ship burial in 1904, do depict horned figures, but these “horned” occurrences only happened — if they happened at all — during rituals. To date, archaeologists have uncovered only two preserved Viking helmets: Both are made of iron, both have guards around the eyes and nose, and both are entirely without horns.

Numbers Don't Lie

Numbers Don't Lie

Year the NFL’s Minnesota Vikings introduced their logo, featuring the historically inaccurate horned helmet
1961
Year Vikings arrived in Newfoundland, the earliest evidence of Europeans in North America (outside Greenland)
1021 CE
Length (in feet) of the Roskilde 6 ship, the longest Viking ship ever discovered
118
Percent by which helmets lower risk of brain injury, according to the American Association of Neurological Surgeons
33

Most of our knowledge of Norse mythology comes from two 13th-century Icelandic works known as the ______.

Ready to reveal?

Confirm your email to play the next question?

Most of our knowledge of Norse mythology comes from two 13th-century Icelandic works known as the Eddas.

Placeholder Image

In English, four days of the week are named after Norse gods.

The names of the days of the week are a mixture of Roman and Norse influences. In 321 CE, Emperor Constantine established the seven-day week. While Romance languages, such as French, Spanish, and Italian, retained the original Latin-based names, the Germanic-based English language chose another pantheon. Saturday, Sunday, and Monday derive from the Romans, but Tuesday is named after the god Tyr, the Norse god of war. Wednesday comes from Odin, who’s also known as “Woden.” Thursday is the most obvious one — Thor’s day — while Friday comes from the goddess Frigg, or Freya.

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.