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Cheese, glorious cheese. One of humanity’s oldest culinary creations, cheese has been around for nearly 4,000 years and comes in more than 1,800 varieties. Here’s a sampler platter of facts about everybody’s favorite dairy product.

Cheese with holes large and small on wooden background.
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Swiss Cheese Is a Scientific Mystery

Surprisingly, nobody really knows for certain why Swiss cheese has holes. The longstanding theory was that bacteria in the cheese emits carbon dioxide, creating bubbles — or “eyes” — that burst as the cheese matures. (Cheese varieties without these eyes are referred to as “blind.”) While this has been the leading hypothesis for the past century, there are other theories. A 2015 study suggests that small particles of hay in milk may cause the famous holes. There’s evidence that these small specks weaken the cheese’s internal structure, causing gas bubbles to emerge.

A child holding a huge block of circular cheese.
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Cheese Is Surprisingly Human

There’s a reason the scent of certain cheeses smells like feet, armpits, or sweat: The bacteria that make human beings stinky are closely related to the bacteria responsible for stinky cheeses, such as Limburger. In fact, some cheeses are so human-like that mosquitoes can mistake them for flesh.

A look at a bull moose feeding on fall foliage.
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The World’s Most Expensive Cheeses May Surprise You

One of the world’s priciest cheeses? Moose. Made in Sweden, moose cheese is created exclusively at a 59-acre farm that sells the stuff to high-end restaurants for approximately $500 per pound. The cheese is amazingly high in butterfat, making it rich and creamy. Even more pricey is pule, a cheese made from the milk of Serbian donkeys. It reportedly costs about $1700 per pound. (Reviewers say it tastes like manchego.)

Flay lay of blue baby bodysuit and a toy right beside.
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Newborn Children Used To Be Welcomed With Cheese

In parts of medieval England, it was traditional for a father to buy a cheese — called “groaning cheese” — when his wife gave birth. The cheese was hollowed out and pieces presented to everyone present around the birth. At the child’s christening, the baby would be passed through the wheel of cheese for good luck.

Confetti in the air with a boombox blaring noise.
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Music May Affect Cheese Flavor

In 2018, researchers separated nine giant wheels of Emmental cheese and played them selections from Mozart’s “The Magic Flute,” Led Zeppelin’s “Stairway to Heaven,” and “Jazz (We’ve Got)” from A Tribe Called Quest, among other sonic selections. The cheeses were exposed to the music 24 hours a day over six months. When food technologists later analyzed the samples, they discovered that the cheese exposed to classical music and rock had a milder flavor compared to a control. As for the hip-hop cheese? It had “a discernibly stronger smell and stronger, fruitier taste than the other test samples.” Researchers are further studying how acoustic waves might affect cheese development.

A mouse on a mission to steal a block of cheese.
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Everybody Loves (To Steal) Cheese

Each year, about 4% of the world’s cheese supply is stolen — making it the most-stolen food in the world. Cheese, after all, is big business: Global sales exceeded $114 billion in 2019. In Italy, Parmesan is so valuable it can be used as loan collateral, according to CBS News. Consequently, the black market for cheese is thriving. From 2014 to 2016, organized crime was responsible for stealing about $7 million of Parmesan. And dairy-based crime definitely isn’t limited to Italy: In 2009, a duo of cheese thieves in New Zealand led police on a high-octane car chase — and tried to throw off the pursuit by tossing boxes of cheddar out the window.

A glowing Crystal ball on a table.
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Cheese Was Once Used for Divination

In both ancient Greece and the European Middle Ages, people occasionally tried to predict the future using cheese — a practice known as tyromancy. By some accounts, the holes in the cheese were “read” as omens, much in the same way the shapes that tea leaves form at the bottom of a cup might be interpreted. In other accounts, women attempted to predict their future husbands by writing the names of suitors on scraps of cheese. The first scrap to mold was the “winner.”

Close-up of a typewriter keyboard.
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There Have Been Poems About Cheese

A 19th-century Canadian poet named James McIntyre tried to make a name for himself by writing lyrical verse in homage to fromage. His poetry included titles such as: “Hints to Cheesemakers,” “Prophecy of a Ten Ton Cheese,” and “Lines Read at the Dairymaid’s Social.” But his most famous work is “Ode on the Mammoth Cheese: Weight over Seven Thousand Pounds.” It is reproduced here in all of its glory:  

We have seen the Queen of cheese,
Laying quietly at your ease,
Gently fanned by evening breeze —
Thy fair form no flies dare seize.

All gaily dressed soon you’ll go
To the great Provincial Show,
To be admired by many a beau
In the city of Toronto.

Cows numerous as a swarm of bees —
Or as the leaves upon the trees —
It did require to make thee please,
And stand unrivalled Queen of Cheese.

May you not receive a scar as
We have heard that Mr. Harris
Intends to send you off as far as
The great World’s show at Paris.

Of the youth — beware of these —
For some of them might rudely squeeze
And bite your cheek; then songs or glees
We could not sing o’ Queen of Cheese.

We’rt thou suspended from baloon [sic],
You’d caste a shade, even at noon;
Folks would think it was the moon
About to fall and crush them soon.

You may have already come to this realization on your own, but it’s worth mentioning that McIntyre is widely considered one of the worst poets of all time.

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The human history of the United States begins with Native Americans. After stewarding the land for generations, Indigenous peoples introduced Europeans to “new food plants, new drugs, new dyes, tobacco, unheard-of languages, novel modes of life,” and much more, as the historian A. Irving Hallowell wrote back in 1957. Here’s a look at just a few of the ways Indigenous peoples impacted American culture.

The Crowning Of Powhatan.
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Powhatan and Patuxet: Aided in the Survival of Early Settlers

The survival of America’s first white settlements hinged on the knowledge of the native population. The settlers at Jamestown would have likely perished during the brutal winter of 1609-1610 were it not for the help of Powhatan captives, who managed 40 acres of maize. The same was true of the Mayflower pilgrims in Massachusetts, who learned how to plant corn thanks to the teachings of the famed Patuxent interpreter, Squanto. The settlers, however, did not return the favor, and continued to take more and more of the natives’ land.

Iroquois Indian Five Nation Confederacy.
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Iroquois: Influenced Federal Power

Today, students are often taught that American democracy has its roots in ancient Rome or Greece. But the American republic also took cues from the Six Nations of the Iroquois Confederacy. Philosophers like John Locke, whose writings influenced the creation of the United States, wrote with amazement about how the Iroquois Confederacy vested power in people, not a monarch. Meanwhile, Benjamin Franklin wrote letters to the Iroqouis, seemingly calling out how people incorrectly viewed them as “ignorant savages,” and spent significant time learning about their federal-style government. In 1751, Franklin wrote, “It would be a strange thing if Six Nations of ignorant savages should be capable of forming a scheme for such an union, and be able to execute it in such a manner as that it has subsisted ages and appears indissoluble; and yet that a like union should be impracticable for ten or a dozen English colonies.”

The idea that the American republic was influenced by the Iroquois can be polarizing, and is often over- or understated. Some argue that American democracy was copy-and-pasted from the Six Nations. Others argue that the Iroqouis had no influence at all. Most historians, however, occupy a middle ground. “It is a fairly important idea that a great many societies and networks influenced American constitutional thought, the Iroquois among them,” historian Gautham Rao tells Politifact.

A hut of the Pima Indians of Arizona.
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Pima: Developed Farm Irrigation

Without water, there can be no agriculture — and no civilization, for that matter. The Pima understood this challenge intimately. Around 1,500 to 2,000 years ago, the nation developed sophisticated irrigation systems across the arid deserts of Arizona, making the region habitable. (And establishing life in what is now Phoenix.) Those technologies paid off. Today, agriculture first cultivated by Native Americans makes up 60% of the world’s food supply, including pumpkins, cranberries, squash, pineapple, avocados, peanuts, and, of course, corn.

A family of Plains Indians transport their possessions on a travois.
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Plains Indians: Initiated Early Sign Language

Native Americans communicated through sign language centuries before the development of ASL. First recorded in the 1520s, the system — now called Plains Indian Sign Language — was used as a lingua franca by dozens of native nations across the American continent, including the Navajo, Cree, and Crow. The system allowed disparate tribes — many of which spoke completely foreign languages — to communicate and trade. While American Sign Language would later take inspiration from multiple language systems, the sign language developed by Native Americans remains one the world’s oldest and most widespread.

A Group of Algonquin men.
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Algonquin: Created Lacrosse

First played in southern Canada more than 200 years ago, early lacrosse games were a chaotic ballsport consisting of hundreds — and sometimes thousands — of participants at one time. When Europeans began settling on North America, some tribes used the game to win the newcomers’ trust. In 1763, the Ojibwa people of Michigan used lacrosse as a Trojan Horse. With the British troops watching in the audience, the native athletes slowly worked their way to Fort Michilimackinac, and once they got close enough, they took the fort.

View of an Anishinaabe camp.
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Native Nations: Promoting Conservation

Writers often attribute the rise of the American conservation and environmental movement to Rachel Carson’s 1962 book, Silent Spring. However, Native Americans have been promoting conservation since the beginning of time. In fact, some tribes, like the Anishinaabe, don’t have a word for “conservation” because, to them, it’s much more than a political philosophy — it’s simply a fact of life. A 2019 U.N. report found that land managed by Indigenous populations had stronger biodiversity than land managed through modern agricultural methods.

The Indians are riding a horse and spear ready.
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Native Nations: Shaped Modern-Day Words

You cannot drive around the United States or speak English without bumping into a Native American contribution. At least 26 state names have native origins, including Arkansas (“downstream people”), Mississippi (“great water”), and Ohio (“beautiful river”). English words that have native origins include “chipmunk,” “hammock,” “chocolate,” “tequila,” “canoe,” and “opossum.”

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Few artist names are as recognizable (and as difficult to pronounce) as Vincent van Gogh. The Dutch painter’s name is synonymous with the art movement known as post-impressionism, and van Gogh made an incredible impact on the art world despite an abbreviated life. For all of the beautiful color, expression, mood, and extravagant wonder that filled his canvas, van Gogh struggled with mental illness. Despite these trials, he was an engine of creativity, and the strokes of his brush bestowed upon the world such gifts as “The Starry Night,” “Vase With Fifteen Sunflowers,” “Wheatfield With Crows,” “Irises,” “Café Terrace at Night,” and dozens of mesmerizing self-portraits. These seven facts explore the fascinating life of this self-made artist.

Self-Portrait by Vincent van Gogh.
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Van Gogh Started Painting at 27 And Was Mostly Self-Taught

Born March 30, 1853, in Groot-Zundert, Netherlands, Vincent van Gogh arrived at art through a more circuitous route than most of his contemporaries. Although exposed to the art world at a young age by his mother’s interest in watercolors and his work at his uncle’s art dealership in The Hague, van Gogh suffered a nervous breakdown after a failed marriage proposal and instead started studying to become a preacher. It wasn’t until 1880 — after facing another rejection, this time from the evangelical committee itself — that van Gogh took up the pencil and paintbrush and began experimenting with art at the age of 27. Many of van Gogh’s early works were actually drawings; he believed the art form to be “the root of everything.

However, these drawings, some of which were masterpieces in their own right, were largely eclipsed by the incredible oil paintings that he created over the next decade. This body of work, considered by some to be one of the greatest ever created, eventually earned van Gogh a spot among the pantheon of history’s greatest artists.

A variety of Van Gogh paintings collaged together.
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Van Gogh Created 900 Paintings in Less Than 10 Years

Seemingly making up for lost time, van Gogh painted around 900 paintings from November 1881 until his death in July 1890 at the age of 37. Van Gogh often depicted subjects like peasants or farmers (one of the most famous examples being “The Potato Eaters”), or even himself, because he was too poor to pay any models. Flowers were also a frequent subject.

Although museum-goers can glimpse some of van Gogh’s most famous paintings crafted during these incredible years of creativity, many of the artist’s works were destroyed either after his death or during World War II. In addition to these lost works, another 85 van Gogh pieces are considered “missing” to this day.

'The Red Vineyards at Arles', 1888. Artist: Vincent van Gogh.
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Van Gogh May Have Sold Only One Painting in his Lifetime

Although a number of theories suggest van Gogh sold or bartered a few paintings, the only verified account of a painting being sold during his lifetime was when “The Red Vineyard” sold at a Brussels exhibition for 400 Belgian francs in March 1890, only a few months before the artist’s death. Although a small amount today, those francs amounted to essentially two months’ living expenses in 1890.

Overall, van Gogh was famously underappreciated as an artist during his lifetime. The popular conception of him is as a solitary genius who was shunned by the art community at large, and his combative and antisocial personality didn’t ingratiate himself to others. However, evidence exists that van Gogh was beginning to gain wider recognition a couple of years before his untimely death. An article published in the January 1890 issue of Mercure de France acknowledged van Gogh’s detractors but noted that he was ultimately understood by “his brothers, the true artists.”

Paul Gauguin (1848-1903), French painter born in Paris.
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Van Gogh Had an Intense Friendship With Famous Painter Paul Gauguin

Much like van Gogh, Paul Gauguin was also unappreciated during his lifetime, but gained fame after his death for his inventive use of color, among other things. Gauguin arrived in the French town of Arles in October 1888 at the behest of Theo van Gogh — Gauguin’s art dealer and Vincent’s younger brother and benefactor. Theo promised Gauguin a small sum to look after his brother, and the artist saw the opportunity as a way to raise money for his return trip to Martinique, an island in the Caribbean that served as Gauguin’s muse. Vincent, however, had other ideas, and hoped Gauguin would stay and be the leader of a new artistic community based in Arles.

The two settled in a small house in the center of town, immortalized by van Gogh’s painting “The Yellow House,” and both artists painted similar subjects, developing a sort of rivalry. Gauguin even captured van Gogh in the creative process in his portrait titled “The Painter of Sunflowers.” However, van Gogh’s increasingly erratic behavior caused Gauguin to eventually flee Arles, but not before one of the most dramatic moments in art history unfolded. Speaking of which…

Manipulation style of Vincent van Gogh studio.
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The Story About Van Gogh’s Ear Is Still a Mystery

When people think of van Gogh, their minds usually meander among his masterworks, such as “The Starry Night” and “Sunflowers,” along with the infamous incident involving his severed ear. Today the story is filled with hyperbole and hearsay, and that’s largely because no one is exactly sure what took place on the evening of December 23, 1888. What we do know is that a fight erupted between Gauguin and van Gogh, and the latter suffered what some historians have called a “cataclysmic breakdown.”

Gauguin’s first-hand account says van Gogh approached him with a razor before pausing and retreating back to their home. Understandably freaked out by the incident, Gauguin decided to check himself into a hotel and call it a night. It was at some point soon after this altercation that van Gogh took the razor to himself and mutilated his left ear. Some reports say the troubled artist only severed his ear lobe, but further analysis has uncovered that van Gogh in fact removed his entire ear, leaving only a piece of the lobe behind. The story goes that van Gogh then delivered the ear to a prostitute before collapsing at his home in a pool of blood. Although van Gogh did travel to Arles’ Red Light District that night, historians believe that he actually delivered the ear to a cleaner — not a prostitute. The details of the event will always remain hazy, but the dramatic moment is a powerful reminder of the mental illness van Gogh suffered from for his entire life.

The Starry Night painting, June 1889.
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Van Gogh painted “Starry Night” While in an Asylum

That December night was a bloody tragedy for van Gogh, but it was only a chapter in the life of an artist who experienced dismal lows followed by unprecedented artistic highs. While staying at the Saint-Paul asylum in Saint-Rémy, France — recovering from the ear incident — van Gogh painted roughly 150 paintings at a pace of about one painting every other day. Sometime in mid-June of 1889, he painted his most well-known masterpiece: “The Starry Night.” The Dutch master was inspired by the view outside his second-story asylum window, which he had painted several times before. Because he couldn’t paint in the dark, he actually painted the view from memory during the day.

The painting takes drastic departures from the actual view from his window, with the most obvious being that the dominant cypress trees in the foreground were actually much smaller in real life. Van Gogh also couldn’t glimpse a village from his window, and instead drew an idealized village (as it doesn’t resemble nearby Saint-Rémy).

The night sky itself is also an amalgamation of nighttime and early dawn views, and while the swirls throughout the heavens might seem like a clear example of artistic license, some art historians argue that van Gogh — who was passionate about astronomy — would’ve likely known about the swirling depiction of spiral galaxies found in popular French astronomy books of the day.

Sister of Vincent Willem van Gogh, Johanna Bonger.
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Vincent’s Sister-in-Law Made Him Famous

Theo van Gogh was Vincent’s constant companion and benefactor throughout his life. Theo supported his brother’s art and also sought care for Vincent’s mental illness. However, Theo himself wasn’t exactly a paragon of perfect health, and after Vincent’s suicide on July 29, 1890, Theo developed complications from syphilis and died only six months after his brother, at age 33. It’s very possible Vincent van Gogh would have remained a little-known Dutch post-impressionist if not for the tireless work of Theo’s wife and widow, Johanna “Jo” van Gogh-Bonger.

After her husband’s death, Jo inherited Vincent’s paintings, and spent the rest of her life fulfilling her late husband’s wish to promote his brother’s art. Jo made strategic sales to collections that were visible to the public, and in 1905, she secured a Vincent van Gogh retrospective at Stedelijk Museum in Amsterdam, which showcased more than 480 works. As Vincent’s popularity rose, she also published, in 1914, a collection of letters written between him and her husband, which only raised appreciation for the artist. After Jo’s death in 1925, her son carried on her work and became one of the founding members of the Van Gogh Museum in Amsterdam.

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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.

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Marsupials: They’re not just kangaroos! From iconic Australian wildlife like wallabies and koalas to the furry friends in South American rainforests to the single species of North American opossum, these animals take many forms. What ties them together is how their babies grow: They emerge as embryos and develop the rest of the way outside the womb, usually in a pouch. Each species has its own special quirks, though, including some incredibly adaptable pouch variations.

Which notable land animal has equal command of the sea? Which animal is giving the Easter Bunny a run for its money in Australia? What small desert creature is rarely seen by humans?

From the unusual feeding habits of mama koalas to why backyard opossums are not as scary as they may seem, these facts about marsupials show the deep diversity in this special order of animals.

Eastern Gray Kangaroo swimming in the water.
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Kangaroos Are Great Swimmers

On land, a red kangaroo — the largest of the kangaroos — can leap along at more than 35 miles per hour and jump up to 6 feet high. They have a strong command of the water, too, and can even use their forepaws to drown potential predators.

A 1974 research paper described their profound natural instinct for swimming, and noted that red kangaroos observed in a pool reached speeds of about 1 meter (a little more than a yard) per second. Although both kangaroos in the pool had been raised in captivity and had never swum before, it took them only 10 to 15 seconds to adapt and start swimming in a pattern that they wouldn’t use on land, using their back legs to stay afloat. Their forward motion came from stroking using their front legs, with the digits of their paws fully extended. Sweeping their tails horizontally from side to side like the back fin of a fish also helped propel them forward (on land, kangaroo tails typically move vertically).

Kangaroos of multiple species have been observed swimming in the wild, with at least one swimming about 2 miles when threatened. On YouTube, you can see kangaroos swimming along an open coastline and in more sheltered waters alike.

Wombat exposing his amazing sharp teeth.
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Wombats’ Teeth Don’t Stop Growing

Wombats have a lot in common with groundhogs and other rodents found in North America, but these Australian beasts are marsupials and significantly larger, at about 31 to 47 inches long. They all spend a lot of time gnawing on stuff, though, so wombats have very similar teeth: They’re rootless, and they never stop growing.

The common wombat has two pairs of large incisors, one at the top and the other at bottom of their jaw, and 16 molars tucked into its cheeks. As long as wombats stick to their regular diet of highly abrasive grasses, their teeth grind down as they grow — although some wombats, especially those in captivity, require special dental intervention to keep things from getting out of hand after eating less fibrous foods.

Little Brazilian short tailed opossum.
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Some Marsupials Don’t Have Pouches

A fully functional pouch is not a prerequisite for being a marsupial — it’s just a common convenience for animals that give birth to babies that aren’t fully developed — so some joeys are left to just cling to their mothers’ teats and hope for the best. Some species only have the remnants of a pouch.

Short-tailed opossums, a species native to Brazil that’s between the size of a mouse and a rat, have no pouch at all. When their embryos emerge, they don’t even have limbs yet, so they use their little nubs (with tiny claws!) to scramble for a nipple and attach. A seal forms that holds the baby on, and the mother can retract her nipples into her body, holding the babies close until they’re ready to detach.

Yapok, also called a water opossum.
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Water Opossums Have Built-In Swimsuits

The yapok, also called a water opossum, is native to the lakes of Mexico, Central America, and South America, and has two kinds of pouches: one on male yapoks and one on females. Male yapoks’ pouches don’t serve quite the same reproductive purpose, though. When they’re swimming, moving quickly, or diving, they have a muscle that can pull their pouch up to protect their reproductive equipment and keep it dry.

Female yapok pouches are also pretty cool, though: They create a sealed compartment that can keep the babies inside dry while mom is swimming.

Rabid opossum in a metal cage.
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Opossums Have a Natural Immunity to Rabies

Because of their tendency to crawl around in the trash and hiss at people open-mouthed and drooling, opossums are often thought to carry rabies. Not only are the creatures bluffing when they pretend to be vicious, but it’s actually exceedingly rare for them to contract rabies, possibly because they have a much lower body temperature than other warm-blooded animals like raccoons and bats.

Opossums may look scary at times, but they’re one of the better scavengers to find in your backyard. They rarely eat live chickens, but do eat garden pests, small rodents, fruit that has fallen from trees, and messes left behind by less courteous passing critters.

Captive Greater Bilby on red soil.
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Australia Has “Easter Bilbies” in Addition to Easter Bunnies

Easter Bunnies make sense in Europe and the Americas, which have native rabbit species. In Australia, not so much: Rabbits, which were brought from England in the 1800s, are an incredibly invasive species Down Under.

Bilbies, on the other hand, are native to Australia. They’re marsupials about the size of rabbits, with similarly long ears and an adorable face, along with a shrew-like snout. They’re also endangered, thanks in part to the interloping rabbits that started pushing bilbies out of their burrows, leaving them vulnerable to cat and fox attacks that were already on the rise with the arrival of European settlers.

Enter the Easter Bilby, a now-decades-long Australian tradition. It has its origins in 1968, when a nine-year-old girl wrote a story called “Billy the Aussie Easter Bilby,” which she later published. It really started catching on in the 1990s, though, after the Foundation for Rabbit-Free Australia started a campaign to promote native wildlife. Candymakers caught on, and now you can find Easter Bilbies on Australian shelves every year, often raising money for preservation groups.

Easter Bunnies are still sold in Australia, too — but the Easter Bilby has caught on as well, introducing new generations to this uniquely Australian animal.

The southern marsupial mole.
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Marsupial Mole Sightings Are (Very) Rare

Marsupial moles, a pair of species native to Australia called kakarratul and itjaritjari, really keep to themselves. Like standard moles, which evolved completely separately, they have no sense of sight (moles have no eyes; marsupial moles have no optic nerves and only vestigial lenses) and live their lives digging underground. Unlike moles, they don’t leave any trail behind, instead moving seamlessly through soft desert sand as if they’re swimming. As is the case with other burrowing marsupials, their pouch faces backward, which shields their babies from the dirt.

They live most of their lives underground, and not only do they leave little trace of where they’ve been, but they rarely show their silky golden faces above the surface. A mere sighting can be a newsworthy event. One Australian scientist estimates that humans see them above the surface only about 10 times a decade.

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Philosophers and scientists agree: Memories help shape who we are. A lifetime of experiences, cataloged and stored in our brain, helps form internal biographies that orient us throughout our lives — but memory is more complex than a simple chronological record. Different kinds of memories help us achieve different things, and many facets of memory continue to baffle scientists. These seven facts explore the fascinating world of memory, the role it plays in our lives, and some of the mysteries that still surround this psychological process.

hands holding missing white jigsaw puzzle piece down into the place as a human brain.
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There Are Many Types of Memories

Human memory is too complex to be described by just one type — so experts use four categories. Long-term memory is likely the category that comes to mind when you think of “memories,” since this type holds important biographical information. This mental category can be further divided into semantic memory, the stuff that helps you recall bits of trivia and other learned skills, and episodic memory, which keeps track of the vital moments of your life.

Another type of memory is sensory memory, which is initially triggered by one of the senses but is incredibly fleeting (interestingly, experts believe all memories first form as sensory memories). There’s also short-term memory, the one that’s supposed to keep track of your keys. Finally, there’s working memory, which helps the brain hold onto small tidbits of information in order to perform cognitive tasks. Some categorize working memory as a type of short-term memory, but it typically lasts longer and is mostly confined to the manipulation of information.

Holding a memory card next to closed eyes.
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The Brain Can Store 2.5 Petabytes of Information

With the average life span of a U.S. citizen in the upper 70s, that’s a lot of time (and a lot of memories) for the brain to process and store — but amazingly, our minds are more than up for the task. Scientists estimate that the human brain can store upwards of 2.5 petabytes of information. A petabyte equals a million gigabytes, so that is a lot of storage space. According to Scientific American, that amount of information is equivalent to recording your television for roughly 3 million hours (which would take roughly 342 years nonstop). It’ll be a while before the iPhone can match the amazing memory-storing power of the human mind — brought to you by millions of years of evolution.

Woman sleeping in bed.
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Dreaming Is the Result of the Brain Organizing Memories

Theologians and philosophers since time immemorial have tried to make sense of dreams, and the ability to interpret dreams appears in religious texts and pagan myths alike. When a person sleeps, they fluctuate among light, deep, and rapid-eye movement (REM) sleep, and it’s during this last phase — which accounts for roughly one-fourth of our sleeping hours — that the brain consolidates memories. If you look at the activity of a person’s brain when in REM sleep, it fires as if it’s awake, but the chemicals in the brain — such as serotonin, norepinephrine, and histamine — are blocked so we don’t injure ourselves by physically acting out our dreams. Research shows that during REM sleep, dreams are a reflection of a biological process wherein the brain strengthens neural connections to important experienced events while ditching the inessential information — all while preserving the integrity of current memories and adding new information. You can kind of think of your brain as a very large filing cabinet, and every night, your brain has to add new files to its ever-growing record system while simultaneously not upsetting its organized methodology.

Elevated View Of Couple Looking At Baby's Photo Album.
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Babies Form Memories (We Just Don’t Remember Them)

Ask anyone to describe their very first memory, and one thing is common — no one remembers their first two years. Scientists sometimes call this biological phenomenon “childhood amnesia,” an inability for older children and adults to recall their earliest years on Earth. But this doesn’t mean babies don’t form memories at all — studies in the ’80s and ’90s found that within the first few months, infants could form memories that aided in learning and completing simple tasks. The problem is that babies don’t form episodic memories (see above), a form of long-term memory that helps us remember details from specific events. When we’re between the ages of 2 and 4, our brain’s hippocampus — the region responsible for tying fragments of information together — begins to make the necessary neural connections for episodic memory, which is why your very first memories lie somewhere within these toddler years.

Couple of seniors has fun solving puzzles as a memory training.
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Some People Can Recall Every Day of Their Lives

Those blessed with a good memory can still usually conjure only a fuzzy picture of the past, but for people with hyperthymesia (also known as “highly superior autobiographical memory”) — a condition that gives the brain the remarkable ability to remember every single day of a person’s life since adolescence — memory is both a blessing and curse. In a famous 60 Minutes interview in 2010, one person with hyperthymesia described her exacting recall as effortless, saying, “It’s almost as automatic as if you say, ‘What is your name and where do you live?’” Name any date, and they’ll almost immediately tell you what day of the week it was and what they did that day. But a superhuman memory means remembering things best left forgotten. The first person to ever be identified with this condition, Jill Price, has described the experience as haunting, telling the Seattle Post-Intelligencer in 2008, “I’ve been through hell in my life.” As of 2021, only 60 or so people have been diagnosed with the condition, but their superhuman memories give scientists an unparalleled opportunity to study the still-unknown marvels of the human mind.

Top view of woman looking at her retro photographs.
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We Don’t Know If Photographic Memory Exists

While hyperthymesia is real, there is no existing evidence that a “photographic memory” — that is, the ability to recall any previously glimpsed image and examine it in precise detail — actually exists. The belief in this kind of memory may have grown out of the biological fact that humans are generally better at recalling visual material than other forms of information. The only known example of a condition similar to photographic memory is something called “eidetic memory,” when someone can hold an incredibly detailed and accurate image in their mind but only for a short time. Strangely, this incredible ability is relatively common in young children and virtually absent in adults, leading scientists to believe that this snapshot memory plays some role in cognitive development in early childhood.

A man smelling a small bouquet of flowers.
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Smell Triggers Particularly Strong Memories

Unlike our other senses, our sense of smell is more directly hardwired into the parts of the brain that deal with memory. Instead of electrical signals being sent to the thalamus as in other senses, smell bypasses this region of the brain and instead travels to the olfactory bulb, which is directly connected to the hippocampus and amygdala — areas of the brain associated with processing memory and emotion. These strong connections are likely why smell can elicit such powerful memories throughout our lives. A study in 2017 found that one part of the olfactory bulb in particular — known as the piriform cortex — is responsible for depositing scents in our long-term memory. This cortex links up with other regions of the brain to determine whether a smell earns a spot in the filing cabinet of our mind. Often, these memories take us back to our childhood, as the recollections tend to be associated with the first time we smelled a certain scent, allowing us to relive those early years, if only briefly.

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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.

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On June 19, 1865, some 250,000 enslaved people in Texas gained their freedom, ending slavery in one of its last major outposts in the United States. Today, this momentous event is marked by a federal holiday known as Juneteenth, which is sometimes referred to as the U.S.’s second Independence Day. Although a new holiday for many Americans, Juneteenth has a long history. These six facts show why the day more than deserves a hallowed spot among the nation’s holidays.

American Union Army Major General Gordon Granger poses in his Union Army uniform.
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Juneteenth Commemorates a Proclamation — But Not Lincoln’s

Most Americans are familiar with the Emancipation Proclamation — President Abraham Lincoln’s famous 1863 declaration that freed all enslaved people in the Confederacy — but the proclamation itself didn’t guarantee those freedoms. In fact, it would be a couple of years before Confederate General Robert E. Lee surrendered his Army of Northern Virginia at Appomattox Court House to General U.S. Grant. Although the surrender was the last nail in the Confederacy’s coffin, many Texas enslavers still resisted emancipation. On June 19, 1865, Major General Gordon Granger issued General Orders, No. 3, stating that “the people of Texas are informed, that in accordance with the proclamation from the Executive of the United States, all slaves are free.” Backing up that order with 2,000 federal troops in Galveston, Granger ensured the freedom of a major portion of the last remaining enslaved people within the borders of the U.S.

A Texas Historical marker at the City of Houston's Emancipation Park.
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The First Juneteenth Was Celebrated One Year After the Civil War

It didn’t take long for Juneteenth (originally known as “Emancipation Day” or “Jubilee Day”) to become a beloved celebration. One year after Granger’s General Orders, No. 3, the newly freed people of Texas celebrated the very first Juneteenth with community gatherings throughout the state that included sports, cookouts, dancing, prayers, and even fireworks. Over the years, celebrations became ever more elaborate — and more resilient, as racist Jim Crow laws took hold of the South. To continue celebrating the holiday, some freedmen even bought land in 1872 in Houston as a place to celebrate Juneteenth every year (today, that land is known as Emancipation Park; Juneteenth is still celebrated there). One by one, freed Texans traveled to other parts of the United States, and brought their Juneteenth customs with them. By the 1920s, the holiday was unofficially celebrated around the country.

Juneteenth day picnic food.
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The Color Red Is Prominent in Juneteenth Celebrations

For more than a century, Juneteenth celebrations have been accompanied by red velvet cake and red-hued refreshments, whether strawberry soda or red lemonade. There are a few theories behind this color-specific culinary tradition. One is that the color red is a significant hue in West African cultures, often symbolizing strength and spirituality. Another theory is that red featured prominently in the enslavement narratives of Yoruba and Kongo people forcibly brought to Texas in the 19th century. Other historians argue that the color is tied to special occasions dating back to ancient African traditions.

As for red drinks specifically, the tradition is likely linked to two West African plants — the kola nut and hibiscus — which can be used to make a variety of red-hued teas and refreshments. After the Civil War, newly freed Black folks also often infused lemonade with cherries or strawberries to make a cheap, refreshing drink. With the advent of food dyes and the arrival of the Texas-made Big Red soda in the 1930s, red foods and drinks were solidified as a staple of the Juneteenth menu.

Washington Monument where people joined in support of the Poor People's Campaign Washington.
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Juneteenth Was Revived During the Civil Rights Movement

At the end of the 19th century and beginning of the early 20th century, Black people living in Texas — along with the rest of the American South — were victimized by Jim Crow laws and a surging white supremacist movement. Many Black families left Texas during the Great Migration, and the holiday seemed doomed to be stamped out by this new wave of virulent racism. During World War I, some even viewed Juneteenth as unpatriotic, as it focused on a “dark chapter” of U.S. history. But the holiday found new life — nearly a century after it was first celebrated — during the civil rights movement of the 1950s and ’60s. The Poor People’s March on Washington, occurring only months after Martin Luther King Jr.’s assassination, was specifically organized to coincide with Juneteenth in 1968. By the 1970s, major cities around the U.S. were holding large Juneteenth celebrations, and in 1980 Texas became the first state to officially make Juneteenth a holiday.

People carry a Juneteenth flag as they march during a Juneteenth re-enactment celebration.
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Juneteenth Has Its Own Flag

Created in 1997, the Juneteenth flag is full of symbols — some more obvious than others. Starting with the most basic, the date June 19, 1865, running along the flag’s outer edge, represents the date of Granger’s General Orders, No. 3. The single star in the flag’s center represents Texas (aka “the Lone Star State”) as well as symbolizing the freedom of all Black Americans in all 50 states. Around the star is a “nova” (a kind of starburst), representing the birth of a new beginning for African Americans throughout the country, while the arc across the flag’s center represents a new horizon. Finally, the red, white, and blue color scheme tells us that enslaved people were and forever shall be remembered as Americans.

Office closed marked on a calendar in observance of the Juneteenth federal holiday.
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It’s the U.S.’s Newest Federal Holiday

Although the celebration of slavery’s end stretches back more than 150 years, Juneteenth didn’t become a federal holiday until 2021, when President Joe Biden signed the Juneteenth National Independence Day Act. Prior to that, the last holiday to be recognized by the federal government was Martin Luther King Jr. Day, back in 1983. Before Juneteenth became a federal holiday, all but one state (South Dakota) recognized it as a holiday, though only six states — Texas, Massachusetts, New York, Virginia, Washington, and Oregon — made it an official paid day off (that number has since grown). In 2023, more than 25,000 people will attend Philadelphia’s Juneteenth Parade & Festival, museums across Alexandria will organize Juneteenth events in Virginia, and citizens living in a free nation will return to Galveston, Texas, to once again celebrate the end of this great injustice.

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For mountaineers looking to climb the world’s most challenging peaks, Everest is the top prize. At 29,032 feet, Everest is the highest mountain in the world in terms of elevation and the crown jewel of the Himalayas. (Overall, the region is home to nine of the 10 highest peaks in the world, with the exception being K2 in the Karakoram range.) Although its height is its most touted feature, Mount Everest is the subject of many incredible facts — some of which stretch 50 million years into the past.

Evening view of Ama Dablam on the way to Everest Base Camp.
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Mount Everest Has Many Names

Beginning in 1802, the Great Trigonometrical Survey was a massive undertaking to painstakingly survey the entire Indian subcontinent (then a colony of Britain). British surveyor George Everest served as the Surveyor General of India for 13 years (1830 to 1843) before retiring and returning to Britain.

In 1865, a mountain previously named “Gamma,” “peak b,” and finally “Peak VX” received a new name that finally stuck — Mount Everest. Everest’s name was put forward in 1856 by his successor, Andrew Scott Waugh, in honor of his friend and mentor. However, the traditional Tibetan name of the mountain is Chomolungma, which means “Goddess Mother of the World.” The Sanskrit name is Sagarmatha, or “Peak of Heaven.”

Sir George Everest, military engineer, 1854-1866.
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Everest Never Saw the Peak Named After Him

Although George Everest dedicated his life to surveying the Indian subcontinent, he never traveled to Nepal, and likely never saw the famous peak that now bears his name. His closest connection with the mountain was through his protégé Andrew Scott Waugh, who made the first scientific observations of the mountain and announced its height at 8,840 meters (29,002 feet) in 1856. This height surpassed Kangchenjunga, a nearby mountain then considered the world’s highest peak. Although K2 came close to knocking it out of the top spot, no other mountain has ever surpassed Everest’s impressive stature.

A mountaineer stops to admire the view of Mt Everest in the middle of the Himalayas.
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Everest Started Forming 50 Million Years Ago

About 50 million years ago, only 5 or 6 million years after the cataclysmic end of the dinosaurs, the Indian subcontinent — traveling some 15 centimeters per year — closed an ancient sea named Tethys and collided with the Eurasian continent. As the two tectonic plates buckled, they formed a dramatic uplift that created Everest along with the rest of the Himalayan mountain chain. Additionally, Everest’s location near the Tropic of Cancer means that mountain glaciers (ice masses that carve away most mountains) are relatively small on Everest, which is part of why it remains so impressively massive to this day.

Hiker walks on train in Himalayas.
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Everest Grows 4 Millimeters Per Year

Everest is already the highest peak above sea level, and it’s still growing. The ancient collision that formed the mountain many millions of years ago is still ongoing, as India continues to advance northward about 2 inches per year. In fact, in 10 million years, India will plow into Tibet by more than 100 miles, effectively erasing the country of Nepal. Through all this tectonic drama, Everest will continue climbing an additional 4 millimeters, or roughly 0.16 inches, per year.

Ama Dablam framed with praying flags in Himalaya, Nepal.
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Mount Everest Is the World’s Highest Mountain — But Not the Tallest

Everything’s relative when it comes to measuring the tallest mountain in the world. Going off of a mountain’s number of feet above sea level is what gives Everest the crown, but there are other contenders for the globe’s tallest peak. The most obvious one is Mauna Kea, a shield volcano in Hawaii that is the tallest mountain in the world when measured from base to peak. In total, Mauna Kea is about 33,000 feet — roughly 4,000 feet taller than Everest.

Another contender is Mount Chimborazo. At 20,564 feet above sea level, this mountain in Ecuador doesn’t even come close to Everest’s height. However, when measuring from the center of the Earth, Mount Chimborazo gets a big boost by being located near the equator. Because the planet bulges at its middle due to the centrifugal forces produced by its rotation, Mount Chimborazo is actually around 6,800 feet taller than Everest.

A jumping spider on a rock.
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Jumping Spiders Are the Only Permanent Residents on Everest

The high altitude of Everest makes it difficult for life to thrive on its slopes — difficult but not impossible. The Himalayan jumping spider is the only known permanent resident on Mount Everest, making it one of the highest-living species on Earth. This impressive feat is even honored in its scientific name, Euophrys omnisuperstes, which means “standing above everything.” Because the spider needs to feed on other insects, it likely feasts on flies and other bugs blown up from lower altitudes, as part of what’s known as an Aeolian Biome.

Sherpas climbing the Himalayas.
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Sherpas Have Evolved To Be Everest-Summiting Pros

The Sherpa people are a tribe native to Nepal, Tibet, and the Himalayan region, and are often guides for foreign adventurers looking to reach the top of Everest and other Himalayan peaks. Scientists have studied the biology of these Native people and discovered that Sherpas have evolved over thousands of years to be excellent climbers in high altitudes.

Climbing Everest’s peak involves a variety of challenges, but one of the deadliest is hypoxia and altitude sicknesses known as HAPE (high altitude pulmonary edema) or HACE (high altitude cerebral edema) — all results of the body’s inability to function properly in low-oxygen environments. With the first known Sherpas living in the region some 30,000 years ago, this tribal group’s mitochondria are much more efficient at using oxygen when it’s scarce compared to “lowlanders.” This amazing ability is why Sherpas hold many mountaineering records, including the most ascents of Everest by a single person (26).

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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Wine has conquered the world. In 2021, global wine consumption topped 23.6 billion liters, or roughly 9,440 Olympic-size swimming pools’ worth of vino. Here are some more surprising facts about reds, whites, and rosés, from their long and illustrious history to the reasons you might want to avoid drinking wine left over from shipwrecks.

View of a wine harvest in the mid 1900s.
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People Have Been Making Wine for Thousands of Years

Between 2007 and 2010, archaeologists excavated a cave near Areni, Armenia, which contained the remnants of an ancient winemaking operation. They unearthed a press for crushing grapes, jars for fermentation and storage, ceramic cups, and the remains of grape vines, skins, and seeds. (The organic material had been preserved by a hardened layer of sheep dung, which protected it from decay.) By analyzing a compound called malvidin, which makes grapes reddish-purple, the researchers estimated that the site was active around 4000 BCE, during the Copper Age, making it the oldest known winery. Even earlier biomolecular evidence of viniculture dates from about 6000 BCE. The oldest type of wine still made today is Commandaria, a sweet red-white dessert blend from Cyprus that dates back to 2000 BCE.

Bunches of the Sangiovese grape (Vitis vinifera).
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Almost All Wines Are Grown From a Single Species of Grape

The mother vine of almost all wines today is Vitis vinifera, a grape likely native to Western Asia. Over millennia, winemakers have domesticated and cross-bred the vines to create subspecies with distinct colors, flavors, and suitability to different climates. About 8,000 cultivars exist today, including well-known varieties like pinot noir, chardonnay, sauvignon blanc, and merlot. V. vinifera vines have long been cultivated in regions with hot, dry summers and mild winters, such as Italy, Spain, and France, but the U.S., Chile, Australia, and South Africa are also major producers, among other countries.

View of the pest control of the grape phylloxera.
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In the 19th Century, an Insect Nearly Wiped Out France’s Wine Industry

One downside of basing a global wine industry on a single grape species is that it can be decimated by a particular disease or pest. A grape-attacking aphid called phylloxera, native to North America, was accidentally imported to France in the 1860s. Whereas indigenous American grape species had built up resistance to the pest, French winemakers had guarded the purity of their vines to ensure their wines’ high quality, which made the plants susceptible to assault from the foreign bug. As a result, phylloxera tore through French vineyards in the late 19th century and forced French winemakers to graft phylloxera-resistant American vines onto the French vines to save them.

A view of a wine vineyard in Chile.
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A Wine’s Terroir Can Be Legally Protected

The 19th-century French vintners initially resisted the plan to graft American rootstocks onto their precious vines over fears that their wines’ special flavor profile, or terroir, would suffer. “Terroir” refers to the whole environment in which the grapes are grown — soil and water characteristics, temperature, altitude, and so on — as well as the flavor and aroma that these factors impart. A wine’s terroir can be a legally protected entity in France, where the AOC system (an acronym for Appellation d’Origine Contrôlée) classifies wines according to their region of production and quality. It’s this system that says Champagne can come only from the Champagne region to protect its unique terroir.

A worker at a California winery pours a glass of wine for a tasting.
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California Wines Beat French Rivals in a Blind Taste Test

In a legendary event dubbed “The Judgment of Paris,” held on May 24, 1976, French wine experts preferred upstart California wines to the finest French ones in a taste test. An English wine shop owner staged the event to drum up business, and everyone assumed a French victory was a foregone conclusion. The nine experts swirled, sniffed, and sipped a variety of reds and whites, then tallied the number of points they awarded to each sample; shockingly, a cabernet sauvignon and a chardonnay from Napa Valley won out, proving that countries besides France could produce the world’s finest wines. A bottle of each winning wine is now in the Smithsonian collection.

Bottles of 19th-century wine lie on a shelf in a cellar.
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Wine Is Often Found in Shipwrecks

Wine has been traded around the world for centuries, and the vessels transporting it have occasionally run into trouble. Today, intact bottles of wine can sometimes be located among the wreckage of sunken ships. Experts advise against drinking their contents, but some curious gastronauts can’t be dissuaded. In 2009, a hurricane disturbed the seafloor around Bermuda and revealed still-corked bottles in the wreck of a Civil War-era ship; a panel of tasters said it was “awful.” Champagne recovered from a 170-year-old shipwreck in the frigid Baltic Sea gave tasters hints of cheese and “wet hair.” Among the recent finds yet to be sampled are unopened bottles of wine from the wreck of the HMS Gloucester, which sank while carrying the future king James II of England, and bottles that went down with a British steamship after a German torpedo attack during World War I.

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Eleanor Roosevelt was one of the most widely influential women of the 20th century — so much so that serving the longest-ever term as First Lady (1933 to 1945), during World War II no less, is only one bullet point on her resume. As an educator, activist, political adviser, and journalist, Roosevelt touched lives all over the world, helped change the course of history, and clearly spoke her mind, even when her views were bolder than those of her husband, Franklin Delano Roosevelt.

After her death in 1962, she left behind an incredible legacy of social justice, taking forward-thinking stances on issues such as school integration, women in the workplace, and immigrants’ rights. Her personal life is almost as interesting, including her untraditional marriage to FDR.

What was her first connection to the Roosevelt family? How did she enter social service? Just how thick was her FBI file? These six facts about Eleanor Roosevelt might teach you something new about the national icon.

Photo of Eleanor Roosevelt.
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Eleanor Roosevelt Was Teddy Roosevelt’s Niece

Eleanor had presidential connections far before her marriage to FDR, and when the time came, she didn’t even have to worry about taking his last name (she was born Anna Eleanor Roosevelt). She was Theodore Roosevelt’s niece; her father was Teddy’s younger brother Elliott.

In case you’re wondering, FDR comes from a different branch of the Roosevelt family. He was Teddy’s fifth cousin (and fifth cousin once removed to Eleanor). The family was split into two distinct clans, both based in New York and each with its own distinct culture and ethos; FDR came from the Hyde Park Roosevelts, while Teddy (and Eleanor) came from the Oyster Bay Roosevelts.

Eleanor Roosevelt reading to children.
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Eleanor Roosevelt’s First Career Was Teaching

Public service was deeply meaningful to Eleanor throughout her life, including in her younger days. Not long after turning 18, she started teaching at the Rivington Street Settlement House, a social services facility serving New York City’s Lower East Side, particularly its immigrant population.

She continued teaching even as her family’s political responsibilities increased. In 1926, she, along with suffragist Marion Dickerman, bought a K-12 private school for girls called the Todhunter School, also in New York City. Eleanor was a popular teacher, and covered a variety of subjects: history, current events, literature, and drama. After her husband was elected governor of New York in 1929, she continued to teach, even though the position required living in Albany. She commuted back and forth between the capital and the city several days a week.

resident Franklin D. Roosevelt seated and wife Eleanor Roosevelt.
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Her Marriage Wasn’t Strictly Monogamous

Franklin and Eleanor Roosevelt’s marriage started out, at least from the outside, as pretty ordinary. They were married in 1905, and had six children between 1906 and 1916. In 1918, however, Eleanor found out that Franklin was having an affair with Lucy Mercer, her former social secretary, which was devastating — at least, at first. The pair remained married as close, supportive partners — Eleanor was hugely supportive of Franklin’s continued political career after he was stricken with polio, and the pair even retained their pet names for one another — but pursued romantic relationships elsewhere, although biographers aren’t sure how physical those relationships got. Franklin continued seeing Mercer, and was even with her when he died in 1945. Eleanor, meanwhile, found relationships with both men and women.

First Lady Eleanor Roosevelt types as newswomen watch.
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She Wrote a Newspaper Column for Nearly 30 Years

Starting at the very end of 1935 and continuing until her death in 1962, Eleanor kept a regular, nationally syndicated newspaper column called “My Day.” Eventually, it appeared in 90 different U.S. newspapers, detailing both her actions of the day and causes she supported — including ones that perhaps diverged a little from FDR’s views. After her husband’s death, she spoke even more freely about her viewpoints, and chose to keep advocating through her writing instead of running for office herself. Some newspapers dropped her column after she advocated for the election of Adlai Stevenson II in his run against Dwight D. Eisenhower in 1956, leading United Features Syndicate to instruct her to limit her support for candidates, which she did not do.

For the majority of the run, Eleanor published six columns a week; only after her health began to decline in the last couple of years of her life did she cut that down to three.

Portrait of Eleanor Roosevelt and Autherine Lucy.
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She Publicly Resisted Racial Segregation

Eleanor’s lifetime overlapped with some particularly dark chapters in America’s treatment of its Black citizens, and by 1939, she was using her platform to loudly and publicly speak against racism and segregation. In 1939, she resigned from the Daughters of the American Revolution, announcing her departure in her column, after the group refused a venue to prominent African American musician Marian Anderson. She and some other presidential advisers, as well as NAACP Executive Secretary Walter White, took the issue to FDR, and Anderson eventually appeared at a much bigger venue — the Lincoln Memorial — performing for a crowd of 75,000.

Even as FDR remained more tepid in opposing segregation, Eleanor kept swinging. When she learned in 1938 that a series of public meetings in Alabama called the Southern Conference for Human Welfare was split down the middle and segregated by race, she tried to sit in the Black section. When a police officer threatened to remove her, she moved her folding chair to the center of the aisle between the white and Black sections, where she stayed for the rest of the conference. Even after facing staunch criticism from conservatives after the Detroit Race Riots of 1943 — she had supported integrating the local housing project at its center — she kept going, and even led civil rights workshops in schools.

She was far from perfect, and even opposed a proposed 1940s march on Washington for racial equality, although she did arrange a meeting between organizers and FDR. But she continued to speak out against segregation for the rest of her life, including strongly advocating for school integration in both her column and in person, especially around the time of Brown v. Board of Education. Her last column before her death emphasized the connection between school integration and aggressive police tactics.

Photo of Eleanor Roosevelt with headphones on.
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The FBI Investigated Eleanor Extensively for Communist Activity

Between her support for civil liberties and doing stuff like inviting a student advocacy organization accused of communist connections to crash at the White House while they waited to testify before the House Un-American Activities Committee, Eleanor was pretty unpopular with J. Edgar Hoover’s FBI. It didn’t help that she called Hoover’s tactics “Gestapo-ish,” either.

She was the subject of one of the largest single files from the era, adding up to around 3,000 pages. In addition to investigating her friends, family, and colleagues, the FBI tracked the existence of supposed “Eleanor clubs,” which white Southern segregationists claimed were secret organizations planning uprisings that would cause their Black domestic employees to turn against them. It turned out that, of course, they were just rumors started by segregationists, who expressed fear of having to work in the kitchen or pay higher wages.

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With the earliest known recipes dating back thousands of years, bread is an engine of history. Its discovery may have kick-started humanity’s transition into an agrarian society, its chemistry created new foods and beverages intimately tied to the cultures that made them, and its availability has often been directly proportional to the rise and fall of kingdoms and empires. Learn more about everyone’s favorite starch-filled staple with these six amazing facts about bread, from the chemical reactions occurring in your oven to the world-changing events it inspired.

Close-up of prepared dough for baking buns or other bakery products.
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Bread Is Made From Fungi

The single-celled organism known as yeast is the engine behind the bread-making process. Once this microscopic fungi is fed simple sugars, the yeast essentially burps up carbon dioxide and ethanol, along with flavor molecules, in a process known as fermentation. This buildup of CO2 and alcohol is what causes bread to rise, and evidence of these gassy expulsions can be found in the holes that form in baked bread. Sourdough starters are made by mixing flour and water and allowing natural yeasts (which can be found in the very air we breathe) to start munching on the carbohydrates. These starters, which are essentially live organisms, can live indefinitely if fed and stored properly. More than 130 of them, from 23 countries, live at the Puratos Center for Bread Flavour in Belgium — the world’s only sourdough library.

Breadcrumbs trail in the forest.
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The Earliest Evidence of Bread Is 14,000 Years Old

In 2018, archaeobotanists from the University of Copenhagen were working in an excavation site in Jordan, an area where a hunter-gatherer tribe known as Natufians lived some 14,000 years ago, when they stumbled upon bits of charred food remains. After closer examination in a laboratory, it became clear that these were bits of breadcrumbs from a time millennia before scientists had believed bread-making really took off. The news was particularly surprising because scientists usually see bread-making as a result of the rise of agriculture, the innovation largely responsible for forming modern society. However, this discovery suggests that it could be hunter-gatherers’ preexistent interest in bread-making that inspired the rise of agriculture — not the other way around.

light wheat beer pouring into a glass.
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Bread Is the Main Ingredient in the World’s Oldest-Surviving Beer Recipe

Bread has been central to our diet for several thousand years, and it’s also been central to our social life. Written in 1800 BCE, the “Hymn to Ninkasi” details a step-by-step recipe for Sumerian beer-brewing in Mesopotamia (modern-day Iran). The text describes the ingredients involved in the process, most crucially the beer bread known as bappir that introduced the required yeast for fermentation.

In 1989, San Francisco’s Anchor Brewing Company recreated the Sumerian concoction, deeming the resulting beverage “drinkable.” Although the “Hymn to Ninkasi” is the oldest-known beer recipe, it’s likely that one of the world’s most popular alcoholic beverages has an even older origin story. Traces of beer in jar fragments have been dated to around 3500 BCE, and some archaeologists expect beer could be as old as — or even older than — bread itself.

The Storming of the Bastille on 14 July 1789, circa 1789.
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Bread Helped Ignite the French Revolution

Bread can be a major player in world events — and events don’t get much bigger than the French Revolution. This transformative moment in the late 18th century was triggered by multiple forces, including changing philosophies, gross inequalities, and a bankrupt monarchy, but some experts argue that the spark that ignited the revolution might have been bread, or more specifically the lack thereof. France’s rising population, heavily grain-based diet, and inability to keep up with demand led to a crisis of bread scarcity that bled into popular outrage. An English agriculturalist traveling through France at the time even commented that “the want of bread is terrible; accounts arrive every moment from the provinces of riots and disturbances, and calling in the military, to preserve the peace of the markets.”

In fact, one of the French Revolution’s most famous anecdotes belongs to France’s Queen Marie Antoinette, who upon hearing of the peasants’ struggle for bread, supposedly replied, “Let them eat cake.” Although historians believe the queen never actually uttered these words, the famous line exemplifies the suffering of the French people and the perceived indifference of its government.

Bread crumbs on a white table.
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Before the Invention of the Eraser, People Used Bread Crumbs

Although the very first mass-produced pencils arrived on the scene in the 1600s, English scientist Joseph Priestley (discoverer of oxygen) didn’t describe “caoutchouc,” or rubber, as an excellent material for “wiping from paper the mark of black lead pencil” until 1770. (Priestley was the one who renamed it “rubber,” because it could be used to rub out marks.) Before the arrival of the rubber eraser, people often used small pieces of lightly moistened bread to erase pencil mistakes. However, these bread-based erasers succumbed to mold, and eventually, rot. Let’s just say the rubber substitute was a welcome innovation.

Fresh variety of breads sliced.
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Sliced Bread Was Invented in 1928

“The best thing since sliced bread” is a phrase celebrating the most glorious of innovations — but it turns out, sliced bread itself isn’t even a century old. The first bread slicer was invented by Otto F. Rohwedder, who worked on his machine for 16 years before it was first used by a small bakery in Chillicothe, Missouri, in 1928. Rohwedder’s invention went against the common thinking among bakers who believed that sliced bread would go stale too quickly. However, customers proved this conventional wisdom wrong, and the bakery’s sales reportedly increased by 2,000% in just a couple of months.

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.