Not unlike their human counterparts, penguin legs have a femur, tibia, fibula, and knee. But unlike ours, the knees are covered by feathers — as is the rest of the upper leg, which is why penguins’ legs look so adorably stubby.
That appearance is most evident when the less-than-graceful birds are seen waddling on land, which is a more energy-efficient means of locomotion than it appears. They use 80% less energy than they would walking the way we do, as their movement relies on momentum and gravity to propel them forward rather than their own effort.
Penguins are found only in the Northern Hemisphere.
Quite the opposite — they’re almost exclusively found in the Southern Hemisphere, primarily Antarctica. Only the Galápagos penguin sometimes ventures north of the equator.
Even so, penguins — which are collectively known as a “waddle” when on land and a “raft” when in water — are at their most elegant when swimming. An adult king penguin can hold its breath for 23 minutes and dive more than 1,000 feet deep in search of food. The animals spend up to 75% of their lives in water, which may help explain why they sometimes look like, well, a fish out of water when going about their business on land.
The largest penguin species by size is the emperor penguin.
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Penguins give each other pebbles as a sign of affection.
Most penguins live in rather barren environments, so they have to get creative when it comes to keeping their young warm. That makes pebbles especially precious as a building material for their “love nests.” Male gentoo penguins also give these desirable stones to their mates as a sign of affection. Picking an especially good pebble out of the water and carrying it a significant distance back to a shared nest is essentially the penguin equivalent of giving someone a love note or a bouquet of flowers.
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Michael Nordine is a writer and editor living in Denver. A native Angeleno, he has two cats and wishes he had more.
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When detectives investigate a crime scene in any prime-time cop drama, they’re often on the hunt for one thing: fingerprints. Because these intricate patterns of whorls and lines are exclusive to each individual, fingerprints have been a go-to method for tracking down suspects for more than a century. However, our fingerprints are not unique when it comes to being, well, unique. Our tongues, like our fingerprints, are also specific to each individual. That’s right — people have tongue prints, which vary from one person to another due to both shape and texture. And perhaps surprisingly, the organ has been gaining some popularity as a method for biometric authentication.
The world’s fastest tongue belongs to the 2-inch-long rosette-nosed chameleon (Rhampholeon spinosus), whose tongue can accelerate at an astounding 1.6 miles per seconds squared. Smaller chameleons have faster tongues in part because their high metabolisms mean they eat more often.
Where fingerprints can be altered, eyes affected by astigmatisms or cataracts, and voices changed just by the all-too-common cold, the human tongue is relatively protected from external factors. Sticking out one’s tongue for a print also involves a layer of conscious control and consent that goes beyond what’s required for retinal scans or even fingerprinting, which could make it a more appealing biometric tool for some. In fact, these “lingual impressions” may be so advantageous over other forms of authentication that some researchers have started investigating the idea of a tongue print database, using high-resolution digital cameras to record every ridge, line, and contour of that muscular organ in our mouths. Although promising, this research is in its early stages — meaning that “lick to unlock” won’t be an iPhone feature any time soon.
The Chinese were the first to use fingerprints as a means of identification.
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Tongue rolling isn’t a genetic trait.
Whether it was in a biology class or from a friend, you’ve likely heard the story that tongue rolling ― that is, forming your tongue in the shape of a “u” — is a genetic trait (shared by an estimated 65% to 81% of people). Although that may seem plausible at first, the genetic explanation of tongue-rolling is actually a persistent myth, and one still found in some biology textbooks today. The idea dates back to 1940, when geneticist Alfred Sturtevant suggested that tongue-rolling was a Mendelian trait — meaning the ability isn’t a combination of parental genes but instead inherited from one parent or the other. However, a study in 1952 involving 33 identical twins (who share the same genetic makeup) found that seven pairs didn’t share the same tongue-rolling trait. Other studies have found that two nonrolling parents can produce offspring who can roll their tongue, suggesting that the “skill” isn’t simply genetics. Sturtevant eventually retracted the idea, yet the myth lives on.
Darren Orf
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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.
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The @ symbol has been in use for centuries, since long before email made it one of the most-typed characters on Earth. The first documented use dates all the way back to a 1536 letter written by an Italian merchant, who used a looping “a” as shorthand for amphorae— a traditional unit of volume roughly equal to a standard clay amphora jar. In other contexts, medieval scribes also used the symbol to mean “at the rate of,” helping to make calculations and bookkeeping more efficient.
As global trade expanded, merchants began using @ in ledgers to indicate price per unit — for example, three barrels @ five florins each. That practical function kept the symbol alive for hundreds of years, even as writing styles, currencies, and languages evolved. The average person, however, rarely encountered it outside of accounting and typewriters.
The “Q” in the QWERTY keyboard name stands for “quick.”
The letters “QWERTY” don’t represent words — they are the first six letters on the top row of a computer keyboard.
That changed dramatically in 1971, when computer engineer Ray Tomlinson needed a character to separate a username from a host computer in the world’s first networked email. It had to be a symbol that was rarely used in names, yet widely understood across keyboards. He selected @, a typographic character used by developers that at the time meant “located at” — as in “user at computer.”
More than five decades later, the @ symbol now helps route billions of messages daily and anchors our digital identities across email and social platforms. Not bad for a 16th-century bookkeeper’s shorthand.
When it first appeared on a typewriter keyboard, the @ symbol was known as the “commercial ‘a.’”
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The @ symbol has many nicknames.
Despite its universal function, there is no globally recognized name for the @ symbol. In the U.S., it’s most commonly known as the “at sign,” and in modern computing terminology, it’s called the “commercial at” (formerly “commercial ‘a’”).
Across other languages, the names are far more imaginative. Several countries have nicknames related to monkeys, likely because of the symbol’s swirling tail. German speakers call it “spider monkey” (klammeraffe) or “monkey’s tail” (affenschwanz). Dutch speakers also use “monkey tail” (apestaart), and Polish speakers refer to it simply as “monkey” (małpa).
Some cultures see other animals in the distinctive curves. Danish speakers have two names for the symbol: “pig’s tail” (grisehale) and “elephant’s trunk” (snabel ). In Russia, it’s called “dog” (sobachka), and in Greece it’s “duckling” (papaki). Italians call it “snail” (chiocciola), while Hungarians refer to it as “worm” (kukac).
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“Huh?” is a humble expression, often a near-involuntary linguistic response, but behind this simple interrogatory palindrome is an extraordinary truth — it’s also universal. According to research conducted in 2013 by the Max Planck Institute for Psycholinguistics in the Netherlands, a version of the word can be found in nearly every language on Earth. Researchers analyzed 31 languages, including Spanish, Mandarin, Icelandic, and Indigenous tongues, and what they found was that every one included a word similar in both sound and function to the English “huh?”For example, in Mandarin it’s a?, Spanish e?, Lao a?, and in Dutch he? No matter the language, the word includes a relaxed tongue and rising pitch, and if there’s a sound before the vowel, it’s an “h”or a glottal stop (a consonant sound made by closing the glottis, the space between the vocal folds). Although there is some variation in pronunciation, the word shows staggeringly little difference among languages compared to what might be expected.
Although the Basque region is located in both Spain and France, its native tongue, Euskara — the oldest European language — shares no origins with either language. No one is entirely sure how Euskara, which is still spoken, originated; it’s one of the great linguistic mysteries.
This raises the question: Is “huh?” even a word at all? Perhaps it’s an innate interjection like a scream or a sneeze, or a nonlexical conversational sound like “ummm” or “aaaah.” Yet the researchers noted several factors that point to “huh?” being a full-fledged word. For one,it’s learned (as opposed to animal sounds like grunts), and children don’t use the word until they’ve started speaking. And even languages without an “h” sound still create a close approximation of the word “huh?” The researchers chock this linguistic similarity up to “convergent cultural evolution.” In the animal kingdom,convergent evolution occurs when two animals develop the same traits due to their similar environment (for example, how sharks and dolphins have a similar streamlined look). In a linguistic sense, convergent evolution occurs when pressures in human conversation — like a lack of information that necessitates a need for clarification — create a universal requirement for a word that is quick and easy to pronounce. In time, all languages naturally arrived at more or less the same response to this need: “Huh?”
Created in 1887, Esperanto was meant to be a universal secondary language for global communication.
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Papua New Guinea is home to more than 850 languages, more than any other country.
No nation compares in linguistic complexity to Papua New Guinea, an island nation with more than 850 spoken languages. The island’s numerous tongues derive from three main groups. The first and oldest is Papuan, which was brought by the island’s first human inhabitants some 40,000 years ago and accounts for two-thirds of the country’s languages. Next is the Austronesian language group, likely arriving from Taiwan 3,500 years ago. Then there are the country’s recent colonial experiences and all the European languages that came with it, including English and German. The country’s mountainous terrain also preserves many languages, as tribes (and their associated languages) remain isolated from the rest of the world. After independence in 1975, Papua New Guinea officially recognized three languages — English, Tok Pisin (an English-based creole), and Hiri Motu — but the decision has had little impact on the incredible linguistic diversity throughout the islands.
Darren Orf
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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.
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When we think of Antarctica, we tend to imagine a vast frozen wasteland, without much going on beyond the icy expanse. But that frigid continent harbors a surprising secret: Beneath the massive West Antarctic Ice Sheet lies the largest known volcanic region on Earth, with as many as 138 volcanoes. While some volcanoes rise above the frozen landscape, more recent discoveries have found volcanoes hidden under the ice.
Antarctica’s most famous volcano, Mount Erebus, was discovered back in 1841. Standing at 12,448 feet above sea level on Ross Island, Erebus is Earth’s southernmost active volcano and is also home to one of the planet’s few permanent lava lakes, which has been bubbling continuously since at least 1972. Along with Deception Island, located in the South Shetland Islands, Erebus is one of only two volcanoes currently considered active in Antarctica.
The largest known volcano in the solar system is three times as high as Mount Everest and as wide as France.
Located in the Tharsis Montes region near the Martian equator, Olympus Mons is one of a dozen massive volcanoes on Mars and the tallest of them all, rising to an incredible 16 miles high.
Over the past century, polar explorers have identified many other volcanoes in Antarctica — at least 40 — typically through the discovery of unusually shaped or prominent mountains that stand out from the icy landscape. With the exception of Erebus and Deception, however, they’re all considered dormant. But in 2017, researchers discovered 91 previously unknown volcanoes lurking beneath the West Antarctic Ice Sheet, and published their findings in the journal Geological Society. By using a combination of satellite data, ice-penetrating radar, and aeromagnetic and aerogravity measurements (used to map Earth's geological structure from the air), they identified zones of basaltic, or volcanic, rock below the ice.
The results don’t indicate whether the newly found volcanoes are active, but it’s certainly a possibility. What’s more, volcanic activity may increase if Antarctica’s ice thins. Robert Bingham, one of the researchers involved in the discovery of the volcanoes, explained to The Guardian that any further loss of ice could release pressure on the volcanoes that lie below, leading to eruptions that could destabilize the ice sheets.
The country with the highest number of volcanoes is the United States, with a total of 165.
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The lowest temperature ever recorded on Earth was at Russia's Vostok research station in Antarctica.
We all know Antarctica is chilly, but it’s hard to imagine just how bitter the cold can get. On July 21, 1983, during the Southern Hemisphere winter, temperatures at Russia’s Vostok research station in Antarctica plunged to a brutal -128.6°F (-89.2°C) — the lowest temperature ever recorded on Earth. To put that into perspective, the coldest temperature recorded in the U.S. was -80°F (-62.2°C) at Prospect Creek Camp, Alaska, in 1971 (the coldest in the contiguous U.S. was -69.7°F, reported from Rogers Pass, Montana, in 1954).
As if -128.6°F wasn’t already cold enough, NASA satellite data has shown evidence of even colder temperatures in Antarctica. In 2013, satellite data analysis revealed temperatures of -135.8°F (-94.7°C) near a high ridge between Dome Argus and Dome Fuji, two summits on the ice sheet known as the East Antarctic Plateau. But because the temperature was measured by satellite rather than by thermometer, the record isn’t recognized by the likes of Guinness World Records.
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By the time most people in Europe started eating with forks, chopsticks had already been around in Asia for millennia. The versatile utensil is believed to have been invented in China roughly 5,000 years ago, although it was initially little more than twigs used for cooking rather than eating (compared to human fingers, chopsticks were a much safer way to grab food from boiling water). None other than Confucius is credited with helping to make chopsticks popular as eating utensils sometime after 400 BCE. A man who espoused nonviolence, the philosopher believed that knives evoked bloodshed and the “honorable and upright man … allows no knives on his table.” (Chopsticks, then, were a more peaceful way to pick up food compared to spearing it with a knife.)
“The Celebrated Chop Waltz,” better known as “Chopsticks,” was the work of Euphemia Allan, writing under the name Arthur de Lulli. Allan did have a brother named Mozart, however, and fortunately for her, he was a music publisher.
Chopsticks gradually made their way beyond China’s borders and were the utensil of choice in other Asian countries such as Japan and Vietnam by 500 CE. Forks, meanwhile, slowly gained popularity throughout Europe after initially being used in their two-tined form by the ancient Greeks and Egyptians for cooking. Around the 11th century, they were introduced as eating utensils in Italy and France, after having initially been used in the Byzantine Empire — still in two-pronged form — but were widely frowned upon for centuries as unnecessarily luxurious or effeminate. Medieval Europe ate mostly with rounds of stale bread used as a platform for meat and vegetables, as well as with knives and spoons, which had been ubiquitous since ancient times. It wasn’t until around the 18th century that the use of forks — finally with three and four tines — became commonplace in much of Europe, in a slow process befitting their status as a late-to-the-party addition to the table.
National Chopsticks Day is celebrated on February 6.
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A small town in Japan produces 80% of the country’s chopsticks.
Despite being home to just 33,000 people, the town of Obama, Japan, produces 80% of all lacquered chopsticks made in the Land of the Rising Sun. With a name meaning “little beach,” Obama — no relation to the 44th president, though the coincidence has certainly brought the city joy — is especially revered for its Wakasa-nuri chopsticks. In addition to more than a dozen layers of lacquer, each of which is a different color, the artisanal implements also feature shells, gold and silver leaves, and a special polishing technique known as migakidashi.
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Michael Nordine is a writer and editor living in Denver. A native Angeleno, he has two cats and wishes he had more.
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Considering most fruits have a spherical or ovate shape, the average banana’s long, curved appearance is something of an anomaly. This unique curvature is due to a scientific concept called negative geotropism, where the stem flexes upward as the plant grows, rather than being pulled straight down by the forces of gravity. While most fruits simply absorb sunlight and grow down toward or into the earth, bananas begin to curve as they strive to find sufficient sunlight to fuel their growth. This has to do with the unique presence of photosensitive hormones called auxins, which influence how bananas react to light.
Bananas contain naturally occurring radionuclides, particularly the potassium-40 isotope. But eating a single banana provides an infinitesimal dose of about 0.01 millirems of radiation. In other words, you’d need to eat 274 bananas every day for seven years to develop radiation poisoning.
Some bananas grow in lush rainforests with dense canopies, which can obscure the fruit from getting enough light. In these cases, bananas will grow toward the sky to break through the light-blocking canopy. But negative geotropism still occurs even in other environments where there’s plenty of direct sunlight. The auxins are distributed unevenly along the side of the banana facing the sun, triggering accelerated growth on that side and causing the fruit to curve away from Earth’s gravitational pull.
In the very early stages of development, bananas actually grow at a straight downward angle, developing their signature shape later on. As the fruit matures, it will begin to flex upward in search of additional sustenance. But even as this happens, gravitational forces will continue to pull the banana down toward the ground and away from the sun. This combination is what ultimately gives bananas their distinct curve.
A visual artist once sold two bananas for $120,000 each.
In 2019, visual artist Maurizio Cattelan unveiled a conceptual piece titled “Comedian” at the Art Basel exhibition in Miami Beach. This unusual artistic work consisted of a banana that had been duct-taped to the wall. For years, Cattelan had dreamed of creating a sculpture in the shape of a banana; he often brought a banana with him on his travels and hung it on the wall for inspiration. But eventually, he gave up on the idea of creating a new sculpture and instead decided to exhibit the banana itself. He brought three editions of “Comedian” with him to Miami, two of which immediately sold for $120,000. Given the high level of interest, Cattelan raised the price of the third one to $150,000, which also promptly found a buyer. A week later, performance artist David Datuna ate one of the pricey fruits right off the wall, criticizing the artwork for embodying wealth inequality and food insecurity.
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Bennett Kleinman is a New York City-based staff writer for Inbox Studio, and previously contributed to television programs such as "Late Show With David Letterman" and "Impractical Jokers." Bennett is also a devoted New York Yankees and New Jersey Devils fan, and thinks plain seltzer is the best drink ever invented.
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Like a lot of masterpieces from centuries past, “The Last Supper” has undergone significant changes since it first saw the light of day. Perhaps most significantly, Leonardo da Vinci’s most famous work not named “Mona Lisa” originally included Jesus’ feet. That particular detail was lost in 1652, when the installation of a doorway on the refectory where the mural was painted led to removing the portion that included Jesus’ sandals. Efforts to digitally restore “The Last Supper” to its original form after centuries of decay have recently made it possible to see not only Jesus’ feet in detail but also the spilled salt shaker on the table (which has been widely interpreted as foretelling doom) as well as Judas’ coin purse.
Frescoes are painted on wet plaster, which requires painters to finish before it dries. Not wanting to do that, Leonardo instead used dry plaster — which means the masterpiece technically doesn't count as a fresco.
If you’d like to see the work today, you won’t be traveling to a regular museum. “The Last Supper” remains in Milan’s Santa Maria delle Grazie, on whose walls it was originally painted (probably between 1495 and 1498), and the convent wasn’t exactly built with large crowds in mind. Small groups are allowed in every 15 minutes, and visitors are advised to make reservations as early as possible — a limited number of people are allowed to see “The Last Supper” each day.
Leonardo’s full name was Leonardo di Ser Piero da Vinci.
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Leonardo da Vinci often wrote backward.
Though no one’s sure why, Leonardo — not simply an artist but a polymath and prolific inventor — had a habit of writing backward. Theories attempting to explain his “mirror writing” include the possibility that he was actually left-handed and taking great pains to avoid ink smudges and keep his hands clean, or that he wanted to make it difficult for prying eyes (including those of the Catholic Church) to uncover his secrets. (He also used his own special form of shorthand.) The habit was so ingrained, according to the Museum of Science, that “only when he was writing something intended for other people did he write in the normal direction.”
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Michael Nordine is a writer and editor living in Denver. A native Angeleno, he has two cats and wishes he had more.
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Only 45 people have ever become president of the United States, making it one of the world’s most exclusive clubs. But even rarer are the 43 people ever known to have “golden blood,” by far the most uncommon blood type.
There are four main blood groups — A, B, O, and AB — but there are also many other, less common types, with Rh null blood, also known as “golden blood,” being almost unfathomably rare. “Rh” is short for Rhesus factor, a group of more than 50 antigens, the most common of which is RhD. People with RhD in their blood have a positive blood type, and people who don’t have RhD in their blood have a negative blood type. Those without any of the 50+ Rh antigens, meanwhile, have Rh null blood.
People with AB positive blood are universal recipients.
AB positive blood recognizes all potential antigens as safe, meaning people with that blood type can safely receive blood from any other type.
In addition to being incredibly rare, “golden blood” carries serious risks related to transfusion. People with Rh null blood in need of a blood transfusion could be in danger if they receive any non-Rh null blood type, which contains antigens their body may reject because they aren’t present in Rh null. This includes O negative blood, whose carriers are otherwise considered universal donors. There are 47 known blood groups and 366 different antigens, highlighting just how rare "golden blood” really is.
Though most of us will have the same blood type for our entire lives, there are a number of instances in which blood type can change. The most common is after a bone marrow transplant, as bone marrow produces red blood cells. If a transplant between a donor and recipient with different blood types is successful, the recipient will inherit the donor’s type.
A change can also temporarily happen after a blood transfusion, specifically when a donor receives large amounts of blood of a different type; after a few months, however, the recipient’s marrow will replace the new blood type with the old one.
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Michael Nordine is a writer and editor living in Denver. A native Angeleno, he has two cats and wishes he had more.
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When McDonald’s tried to add bubble gum-flavored broccoli to Happy Meals, kids weren’t lovin’ it. In 2014, the fast-food giant’s then-CEO, Donald Thompson, revealed the bizarre experiment at an event hosted by a venture capitalist firm. Under pressure to make Happy Meals healthier, the company reflected on how toothpaste and amoxicillin producers had used artificial bubblegum flavoring to make their goods more palatable to children. McDonald’s decided to try a similar tactic with the divisive cruciferous veggie.
Former McDonald's owner and CEO Ray Kroc met Walt Disney when they were teenagers.
After lying about their ages to join the World War I effort, the Illinoisians became acquainted at a Connecticut camp that trained them to serve in the Red Cross Ambulance Corps. The war ended before either Kroc or Disney had a chance to use their skills, however.
Mickey D’s food scientists did successfully make broccoli taste like bubble gum, likely by employing a combination of strawberry, banana, and cherry flavors. However, a focus group of kids was confused by the final product, which they enjoyed about as little as standard broccoli (we’re guessing it wasn’t pink). The item was never added to the McDonald’s menu. Parents who want to impress their kids with a taste bud switcheroo will have to settle on cotton candy grapes.
A piece of gum turns “Charlie and the Chocolate Factory” character Violet Beauregarde into a giant blueberry.
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Swallowed gum does not stay in your stomach for seven years.
The old wives’ tale about gum in the gut has alarmed children for generations. It might have originated from the scientific truth that gum’s base — like corn and seeds — cannot be digested, although our bodies are able to break down sweeteners and oil derivatives present in gum. An accidentally gulped piece of Dubble Bubble won’t stick to the stomach wall or intestinal tract: Gum drifts through your digestive system within a few days.
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