You might be good at multitasking, but you probably aren’t as good as the Alpine swift. The small, swallow-like bird found in Europe and Africa can remain in flight for 200 days while migrating, during which time they eat insects, groom themselves, and even sleep while airborne. Alpine swifts native to Switzerland will fly all the way to Western Africa in order to stay warm during winter, a distance of thousands of miles (and you thought the trip to Florida was long).
Migration comes with no shortage of hazards, and many birds — including ravens, great horned owls, quail, and myriad other species — simply don’t bother. This allows them to save energy, defend their territory, and more easily care for their young.
Weighing in at just one-fifth of a pound, Alpine swifts (Tachymarptis melba) are tiny but mighty. They spend almost their entire lives airborne, although they do roost and breed on cliff faces and other high, rocky areas. And they come from a distinguished family: Scientists have discovered that the closely related common swift (Apus apus) can stay airborne for up to 10 months uninterrupted, now considered the world’s longest continuous flight. Both birds have evolved to adapt to a life in the sky — swifts’ legs tend to be small and clumsy, making the creatures vulnerable to predators while they’re on the ground. Once airborne, though, they can fly fast and free.
Swifts belong to the family Apodidae, which means “without feet.”
Advertisement
Dormice can hibernate for as long as 11 months.
It’s no surprise that dormice are prolific hibernators — their name comes from the French for “to sleep,” after all. After eating so much throughout the summer that they can double their body weight, the tiny, adorable creatures made famous by Alice in Wonderland make nests on the forest floor to prepare for the nap of all naps. Though they usually hibernate for around six months, they’re capable of doing so for as long as 11 — and looking absolutely precious all the while.
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.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
Original photo by Retro AdArchives/ Alamy Stock Photo
While the top three athletes in any Olympic competition take home medals, those who finish in the top eight receive a prize more commonly associated with graduating school: a diploma. Organizers have awarded these diplomas since 1896, the year of the first modern Olympiad, though back then they were given only to the winner. The field was expanded to the top three in 1923, the top six in 1949, and the top eight in 1981.
Much like Olympic medals, the paper certificates are designed by the host country. Early diplomas were quite ornate; the ones awarded at the 1896 Athens Games depicted Greek mythological figures next to the Acropolis. Modern designs, however, are typically more minimalistic, largely featuring text on a white or off-white background.
France has hosted more Olympic Games than any other nation.
While France has hosted six Olympics, the U.S. holds the record with eight as of 2026: the Summer Olympics in St. Louis (1904), Los Angeles (1932 and 1984), and Atlanta (1996), and the Winter Games in Lake Placid (1932 and 1980), Olympic Valley (1960), and Salt Lake City (2002).
Each diploma includes details such as the athlete’s name, the event, and where they placed. The diplomas for the top three medalists have a gold, silver, or bronze background relative to their position. By comparison, diplomas given to athletes who finish fourth through eighth feature an uncolored background.
The diplomas are sometimes sent by mail, while others are presented to the athlete in ceremonies held by their own national organizing committees after the competition. Still, some Olympians are surprised to find out Olympic diplomas even exist.
Norway has won the most Winter Olympic medals of any country.
Advertisement
The Olympic marathon used to be roughly 1.2 miles shorter.
The length of a marathon at the first three modern Olympic Games was measured at around 25 miles, a distance inspired by the ancient Greek legend of Pheidippides, a heroic courier who ran 25 miles from Marathon to Athens to deliver news of a wartime victory.
But the length of the race was extended to 26.2 miles at the 1908 London Summer Games. That decision was made by the British Olympic Committee, who wanted the race to start at Windsor Castle and end right in front of the royal box at Olympic Stadium so the royal family could have the best view of the finish. The 26.2-mile distance was eventually standardized in 1921 for all future Olympic marathons.
Bennett Kleinman
Staff Writer
Bennett Kleinman is a New York City-based staff writer for Inbox Studio, and previously contributed to television programs such as "Late Show With David Letterman" and "Impractical Jokers." Bennett is also a devoted New York Yankees and New Jersey Devils fan, and thinks plain seltzer is the best drink ever invented.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
Superman might be the only thing faster than a speeding bullet, but he has some competition from mantis shrimp. Also known as “prawn killers” in Australia, these pint-sized pugilists punch with about the same force as a .22-caliber bullet. At 50 miles an hour, their punches are the fastest in the animal kingdom — and 50 times faster than the blink of an eye. When they decide to clobber their prey, mantis shrimp create 1,500 newtons of force with their claws; even more amazingly, their punches superheat the water around them to a temperature nearly as hot as the surface of the sun. Their clublike claws are coated in impact-resistant nanoparticles that allow the shrimp to punch to their heart’s content.
Despite its name, the mantis shrimp is neither a mantis nor a true shrimp. Members of the order Stomatopoda, they’re more closely related to crabs and lobsters.
Mantis shrimp use their incredible punching skills to both feed on and fight creatures larger than themselves: crabs, mollusks, gastropods, and other ocean dwellers unlucky enough to get in their way. Videos of the phenomenon are as popular as you might imagine, not least because peacock mantis shrimp, perhaps the most famous type, are so visually striking. Not all mantis shrimp punch, however. There are two main types of hunters — smashers and spearers — and only the former engage in high-speed clubbing. Spearers, meanwhile, impale their prey on spiky forelimbs — a slower but presumably no less painful end.
The mantis shrimp lives in the Indian and Pacific oceans.
Advertisement
Mantis shrimp are older than dinosaurs.
Fossil records indicate that stomatopods branched off from other crustaceans some 400 million years ago, making them older than dinosaurs. And not just a little older, either — dinosaurs first appeared between 200 million and 250 million years ago, making them species-come-lately compared to their fast-punching friends. Other extremely long-lived species include horseshoe crabs (300 million years), alligators (245 million years), and cockroaches (at least 125 million years). Humans, meanwhile, have probably been on the planet for somewhere between 1.4 million and 2.4 million years.
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.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
When we think of where plants come from, we normally picture seeds: acorns dropping from oak trees or dandelion seeds floating on the breeze. But plants actually existed long before seeds arrived on the scene. Land plants likely emerged from ocean algae about 500 million years ago, but fossil records reveal the earliest seed plants didn’t appear until approximately 365 million to 385 million years ago.
During that vast stretch of time, plants relied on spores for reproduction — tiny, single-celled packages that could scatter and grow into new plants. An early group of plants called progymnosperms began manufacturing two sets of specialized spores, male and female. Those were shed from the plant and, if they landed close together, fertilization could take place, producing a new embryo and ultimately a whole new plant.
The total area of the world’s largest single plant is enough to cover all of Washington, D.C.
A single specimen of Posidonia australis seagrass, commonly known as Poseidon’s ribbon weed, covers an area of 77 square miles in Shark Bay, just off Western Australia. Washington, D.C., meanwhile, has a total area of 68.34 square miles.
Eventually, however, evolution came up with seeds as a better solution. With their multiple cells, seeds can be much larger than spores and can sit inside protective shells. Seeds can carry their own stores of food, providing fledgling plants with an immediate source of energy, and they’re also far more adaptable and resilient in various environments, allowing them to lay dormant for hundreds — and in some cases thousands — of years.
Today, there are almost 400,000 known species of plants, and the vast majority of them produce seeds. But spore-producing plants — including mosses, ferns, fungi, and algae — still thrive in suitable habitats, serving as living reminders of how plants conquered the land long before seeds existed.
The stem or stalk of a mushroom is known as a stipe.
Advertisement
Bamboo can grow 35 inches in a single day.
Under ideal conditions, the fastest-growing species of bamboo, such as Moso, can shoot upward at a rate of 35 inches in just 24 hours, earning bamboo the Guinness World Record for the fastest-growing plant. Bamboo typically grows in dense forests where little light reaches the ground, so the plant has evolved to reach vital sunlight as quickly as possible.
Unlike trees that slowly add layers of new cells over time, increasing their girth as they go, bamboo is almost totally focused on vertical growth. It maintains a constant diameter, so it doesn’t waste any energy on growth rings. Rather than having a stalk that progressively thickens, bamboo is basically just a single stick that grows straight up.
Bamboo also has a hollow stem, providing structural strength while using fewer resources to achieve the same heights as other types of plants. The plant also produces cells that can enlarge rapidly by taking in water, quickly elongating the nodes within the stem. The overall growth mechanism is less like watching a building being built brick by brick and more like watching a slinky being pulled from both ends.
Tony Dunnell
Writer
Tony is an English writer of nonfiction and fiction living on the edge of the Amazon jungle.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
Eyes are said to be the windows to the soul, but they’re also a glimpse at humanity’s genetic past. Scientists estimate that between 6,000 and 10,000 years ago, the eye color of all Homo sapiens individuals was brown — likely an evolutionary advantage, as the melanin pigment offers some protection from UV radiation. But then, something changed. Sometime during the Neolithic expansion in Europe, an individual was born with a mutation to the OCA2 gene. This gene code controls melanin production in the iris, and the mutation caused this person’s eyes to turn blue rather than the usual brown. Because blue eyes can only form as a result of this mutation, scientists theorize that all blue-eyed people — about 10% of the world population — are a relative of this original lone blue-eyed ancestor.
No evidence shows eye color affects visual acuity, but some research suggests that blue-eyed people can be more sensitive to bright lights, known as photophobia. Studies have found that blue eyes can be poorly suited for reaction tasks (like hitting a ball) compared to brown eyes.
Strangely, this mutation doesn’t actually turn your eyes blue — in fact, blue eyes are technically not blue at all. The eye’s iris is predominantly made up of two layers: the stroma and the epithelium. Brown eyes have a brown-black melanin pigment in both these layers (though the stroma absorbs the most light), which produces the color brown. Blue eyes, on the other hand, have no melanin pigment in the stroma; in fact, blue eyes have no pigment at all. Instead, they are a reflection of white light in a process called the Tyndall effect. Because blue wavelengths of light are the shortest, they are reflected the most by the fibers in the eyes, which absorb the longer red-orange wavelengths. This bit of complicated optics is similar to how the atmosphere reflects sunlight, turning the sky (and the ocean) a dazzling blue. So while the overall effect is that people have “blue” eyes, from a pigment perspective, the truth is that they really don’t have any color at all.
The famous singer Frank Sinatra is also known as “Ol’ Blue Eyes.”
Advertisement
Humans are less genetically diverse than other primates.
Humans are the least genetically diverse among the great apes. This means that we’re a relatively young species, as enough time hasn’t passed for mutations to accumulate (200,000 years is a geologic blink of an eye). It also means that Homo sapiens likely sprung from a surprisingly small population — around just 10,000 breeding pairs or so. This may be because early humans appear to have survived two genetic bottlenecks while exiting Africa, both of which caused the population to plummet. One theory suggests humans almost went extinct 74,000 years ago due to a massive volcanic eruption, but other studies question if that “eruption” was actually an epidemic. Usually, this low diversity can make it tougher for animals to adapt to climatic changes. Fortunately, what humans lack in genetic brawn, we make up for with our incredibly complex brains.
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.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
Among many other astounding capabilities, elephants inherently understand what pointing means. In fact, research suggests they’re among a few animals that understand the action without being trained by humans. A two-month study of 11 pachyderms in Zimbabwe used two buckets, one with fruit in it and one without, to determine whether elephants could understand which was which. A researcher standing between the two buckets used her arm to point toward the bucket of food, and the elephants successfully chose the bucket the researcher pointed toward 67% of the time.
Despite what countless cartoons would have you believe, elephants don’t fear mice — but they are afraid of bees.
The study was led by Richard Byrne, a professor at the University of St Andrews in Scotland, who told The Guardian, “Elephant society may have selected for an ability to understand when others are trying to communicate with them, and they are thus able to work out what pointing is about when they see it.”
Elephants have exceptionally high emotional intelligence, and communication is key to both their social bonds and survival, which may explain why they’re able to understand this gesture most animals are unable to grasp. Byrne has suggested whales and dolphins as other animals that could feasibly understand pointing, though there’s a major hurdle in finding out whether or not that theory holds water: They’re much more difficult to work with than elephants.
Elephants have the longest gestation period of any mammal.
Advertisement
Elephant tusks are teeth.
Elephant tusks are made of dentine and wrapped in enamel, which is another way of saying that they’re teeth. Deeply rooted but obviously protruding far beyond the mouth, they’re elongated incisors that never stop growing.
More layers of ivory are formed as the tusks continue to grow, with each new layer replacing the prior one. While the tusks are solid at the tip, they become more hollow the closer they get to the elephant’s head. They’re also highly sensitive, meaning it’s extremely painful when they’re removed.
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.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
Regardless of where you find them — be it on a beach, along a riverbank, or in a garden — most shells share a common feature: 90% of them coil clockwise and open to the right. Mollusk shells with these right-oriented openings are called “dextral,” while those with left-leaning apertures are designated “sinistral.” (These terms can be applied to right- and left-handed humans, too; remarkably, left-handedness occurs in shells and humans at similar rates, with an estimated 10% to 12% of people worldwide being lefties.)
The ancestors of octopuses, squid, and other cephalopods once had hard shells. Scientists believe the creatures shed their shells about 160 million to 100 million years ago in an evolutionary change that helped them swim faster, making it easier to catch prey and evade predators.
Some marine life experts believe that just one gene impacts the direction a shell will coil. The rarity of sinistral shells has created a high-priced market for them — they’re so sought-after among collectors that unscrupulous dealers have been known to peddle counterfeits. However, a few species of marine mollusks are predominantly sinistral. The most commonly known is the lightning whelk, a sea snail found in the waters of the Gulf of Mexico. Recognizable by their tapering brown, orange, and cream-colored shells, lightning whelks spend most of their lives submerged in underwater grass beds and at the bottoms of bays, feasting on clams and oysters. Some lighting whelks have reached record lengths of 16 inches — and most of these whoppers have openings pointing toward the left.
The lightning whelk is the official state shell of Texas.
Advertisement
Pearls are the only gems created by an animal.
Beyond being a decadent dish, oysters are best known for their glamorous byproduct: pearls. While pearls are the only gemstone created by a living creature, oysters aren’t the sole producer of these underwater jewels. All other mollusks can technically make pearls, as can some gastropods (aka sea snails, which produce rare melo pearls). The special spheres are formed thanks to an oyster’s natural defense against lodged pieces of food or parasites, which trigger the animal to surround the irritant in layers of aragonite and conchiolin — the same substances that make up shells. These layers create a material called nacre (better known as mother-of-pearl), which has the smooth, opalescent sheen for which pearls are beloved.
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.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
The two-seater upholstered benches we associate with cozy couples were initially crafted with another duo in mind: a woman and her dress. Fashionable attire in 18th-century Europe had reached voluminous proportions; panniers (a type of hooped undergarment) were all the rage, creating a wide-hipped silhouette that occasionally required wearers to pass through doors sideways. Not all women wore such full skirts; some historians believe the average woman of modest means owned a mere four dresses with narrower profiles meant for everyday work. But upper-class women with funds to spare on trending styles adopted billowing silhouettes that often caused an exhausting situation: the inability to sit down comfortably (or at all). Ever astute, furniture makers of the period caught on to the need for upsized seats that would allow women with such large gowns a moment of respite during social calls.
While most famed for his surrealist paintings, Salvador Dalí dabbled in interior design, constructing lamps, chairs, and tables. His best-known upholstered work is a red, lip-shaped couch crafted in 1938 that takes its iconic shape from actress Mae West’s pout.
As the 1800s rolled around, so did new dress trends. Women began shedding heavy layers of hoops and skirts for a slimmed-down silhouette that suddenly made small settees spacious. The midsize seats could now fit a conversation companion; some S-shaped versions were called the “gossip bench.” But when sweethearts began sitting side-by-side, the bench seats were renamed “love seats,” indicative of how courting couples could sit together for a (relatively) private conversation in public. The seat’s new use rocketed it to popularity, with some featuring frames that physically divided young paramours. While the small sofas no longer act as upholstered chaperones, love seats are just as popular today — but mostly because they fit well in small homes and apartments.
The “world’s most expensive love seat” is actually a computer.
The small computers and phones we carry in our bags and pockets are descendants of the monstrously large supercomputers of the ’60s and ’70s — some of which provided their own seating. Originally designed to process data and crunch numbers at superfast speeds, supercomputers were known for dominating floor space and budgets. One standout — the Cray-1A — debuted in 1976 and was quickly nicknamed the “world’s most expensive love seat” thanks to its 39-square-foot column shape with surrounding bench seating. Considered the fastest supercomputer in the world until 1982, the Cray-1A came with a hefty price tag: $8 million, plus a monthly operating cost of nearly $100,000.
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.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
Ever since early humans first stared at the night sky, the moon has played a starring role in stories and folklore. Personified by gods and goddesses such as the Greek Selene, Roman Luna, Chinese Chang’e, and Hindu Chandra, the moon takes various shapes depending on who’s doing the looking. Many Western cultures see a man’s face in the moon, with his misshapen eyes, nose, and mouth formed from the dark lunar “seas” — actually vast hardened lava plains — on the moon’s near side. Others see a whole male figure, with stories from Germany and elsewhere telling of a man banished to the moon for chopping wood on the Sabbath.
The moon is slowly moving away from, not closer to, Earth, at a rate of about 3.78 centimeters a year. The moon would stop this slow separation in about 15 billion years, but by then the sun will have engulfed the Earth during its red giant phase.
Some cultures don’t see a man at all, but instead a woman, like the New Zealand Maori legend of Rona, the moon’s maiden. In Angola, a tale tells of a frog in the moon. In a Chinese tale, the goddess Chang’e flees to the moon, where she is turned into a toad; according to the myth, she and her rabbit, Yutu, can be seen on the moon’s surface creating the elixir of immortality with a mortar and pestle. Many of these tales are thousands of years old, but some remain alive and well to this day. In 2019, China landed the world’s first spacecraft and lunar rover on the far side of the moon; their names were Chang’e-4 and Yutu-2.
Seeing a pattern in an otherwise random image, like a man in the moon, is called pareidolia.
Advertisement
One of the first mainstream pregnancy tests used live frogs.
In sub-Saharan Africa there lives an abundant amphibian called the African clawed frog, or Xenopus laevis. It looks like other frogs, but the females have a special ability — when injected with certain hormones, they begin laying eggs within 12 hours. This strange power was discovered by British zoologist Lancelot Hogben in 1930. Once he witnessed the egg-laying results while experimenting with ox hormones, Hogben wondered if the frogs would lay eggs if injected with urine containing similar hormones from pregnant women. The results were surprisingly reliable, and between the 1940s and 1960s, tens of thousands of Xenopus frogs were injected with urine sent by doctors to special frog labs. The “Hogben test” made pregnancy testing much faster and more widely available than it had been previously; the tests didn’t kill the frogs, so labs could keep colonies on hand and reuse them. In the 1970s, Xenopus laevis was replaced by at-home tests that directly detected the hormone chorionic gonadotropin (hCG), a telltale sign of pregnancy and the same hormone that caused the frogs to ovulate. But the African clawed frog’s career in the sciences wasn’t over, for better or for worse. With large populations of the animals already available for research, they ended up contributing in other fields: The first animal gene ever cloned belonged to aXenopus, and four even took a ride on the space shuttle Endeavour in 1992, which tested the frogs’ ability to reproduce in space. (They did just fine.)
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.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
Iceland is often called “the land of fire and ice,” a nickname describing two of the nation’s most prominent geological features — volcanoes and glaciers. But in recent years, the world’s 18th-largest island has gotten a new reputation as a destination for readers and book lovers, and it’s because Iceland has more authors per capita than any other country in the world. It’s estimated that on an island with a population around 372,500 people, one in 10 will publish a book. There’s even a phrase in Icelandic that relates to the popularity of writing — “ad ganga med bok I maganum,” which roughly translates to “everyone gives birth to a book.” Many writers reside in the island’s capital city of Reykjavik, a major publishing hub that in 2011 was named a UNESCO City of Literature.
Iceland banned most beers for most of the 20th century.
Like many places, Iceland experimented with prohibition, banning wine, liquor, and beer in 1915. The law was mostly repealed in 1933, but kept beer limited to 2.25% alcohol; full-strength brews weren’t allowed until March 1, 1989 — a day Icelanders celebrate as “Bjordagur” (Beer Day).
Icelanders’ love of reading is culturally ingrained in a country that has a nearly 100% literacy rate. It’s likely that storytelling became a tradition thanks to the family sagas passed from generation to generation; these stories described how the first Icelanders found and adapted to the land from around 930 to 1030 CE. Poetry and story recitation became a popular way for Icelanders to keep the stories alive, and provided an important form of socializing on long, winter nights. Today, sharing stories has spawned a more modern tradition, in which Icelanders give books to friends and family on Christmas Eve. The holiday season strain on publishers is so great, and so many books are gifted, that the tradition has its own name: Jolabokaflod, aka the Christmas Book Flood.
The world’s oldest known, still-erupting geyser is found in Iceland.
Advertisement
Some Icelandic towns have curfews for cats.
It’s 10 p.m. — do you know where your cat is? In some Icelandic cities, not knowing could land you a fine. Cats are the preferred pet of many Icelanders, especially those living in the capital city of Reykjavik, a trend that lingered after dogs were banned from the city for six decades to prevent the spread of echinococcosis, a tapeworm that can infect and blind humans. These days, Reykjavik is said to have one cat for every 10 people. Historically, cats have had free reign of the city, but some spots are squashing that tradition, imposing laws that keep cats indoors entirely or creating evening curfews for felines (the creatures are often considered a nuisance). Some ecologists think these restrictions could have a positive impact on the environment: Among other benefits, keeping Iceland’s feline hunters partially indoors would help protect nests and chicks of struggling seabird species.
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.
Advertisement
top picks from the Inbox Studio network
Interesting Facts is part of Inbox Studio, an email-first media company. *Indicates a third-party property.
Enter your email to receive facts so astonishing you’ll have a hard time believing they’re true. They are. Each email is packed with fascinating information that will prove it.
Sorry, your email address is not valid. Please try again.
Sorry, your email address is not valid. Please try again.