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In Greek mythology, the Titan Prometheus stole fire from the Olympian gods and gave it to mortals. Zeus punished this theft by nailing Prometheus to a mountainside and making an eagle eat his liver for all eternity. This rather grim outcome is a sign of fire’s value to humanity: While often destructive, it can also renew, and anthropologists consider our species’ control of fire one of the primary things that helped humans evolve. Read on for five more fiery facts.

Young woman roasting marshmallows over a fire.
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Fire Doesn’t Fit Into the Usual Categories of Matter

First, some basic science: Fire is the visible result of a chemical reaction called combustion, which occurs when a fuel substance, heat, and oxygen interact. Surprisingly, fire doesn’t fit neatly into the definitions of the four states of matter. Despite the gases involved, fire is not a gas, nor is it a liquid or solid. It comes pretty close to being a plasma, a state in which a substance’s molecules are greatly ionized and their nuclei break free of their electrons, but only extremely hot fires achieve that property. Fire’s true nature has yet to be defined.

Close-up of blue flames from gas stove burner.
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Different Fuels Burn at Different Temperatures

The temperature of a fire usually depends on the type of fuel being consumed. When combined with air, burning wood usually maxes out at around 3600°F, a gasoline fire can reach about 3900°F, and anthracite coal fires can burn at 4000°F. On the cooler end of the spectrum, a cigarette burns at about 750°F to 1300°F, and a candle flame can hit 1800°F. The hottest fire ever created — according to Guinness World Records — is one produced by a compound called carbon subnitride (also known as dicyanoacetylene). It results a white-blue flame that can reach 9010°F.

Man starting fire with ember and twigs.
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Determining When Humans Mastered Fire Is a Hot Topic

Exactly when our ancestors mastered fire is an ongoing question. Some anthropologists have proposed that the first use of fire by a member of our genus (Homo) took place between 1.4 million and 1.7 million years ago, based on controversial evidence in Kenya and China. Another team found traces of wood ash in a South African cave that showed use of fire by Homo erectus about 1 million years ago. In 2022, researchers in Israel found the oldest known evidence of using fire specifically for cooking, dating some burned fish bones back 780,000 years.

An even trickier question is when humans made fire, rather than just using it opportunistically (for example, by gathering it from forest fires). Researchers examining Stone Age hearths in two French caves came to the conclusion that Neanderthals in that region lacked the ability to make fire, and that the knowledge probably came about after Homo sapiens arrived there, perhaps 45,000 years ago. The debate continues.

Ring of fire in the Colorado Rocky Mountain forest.
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Indigenous Practices Are Helping To Prevent Out-of-Control Wildfires

For millennia, Indigenous peoples in North America used carefully controlled fires to shape the landscape for their needs, including agriculture, cultural practices, and even preventing larger wildfires. A 2021 study of tree ring evidence from the Pueblo of Jeméz in New Mexico suggests that the residents’ fire management “created a landscape that burned often but only rarely burned extensively.” In the early 20th century, however, the U.S. government began designating national forests and suppressing all fires as soon as they started there. Wildfires subsequently got worse by feeding on the overgrowth of dry vegetation. The Forest Service and other agencies are now collaborating with Tribal managers to adapt traditional fire practices into management policies, aiming to reduce the impact of wildfires.

Darvaza Gas Crater fire in Turkmenistan, during sunrise.
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Some Fires Have Been Burning for Decades — and Even Longer

Underground fossil fuel deposits occasionally catch fire, and they are almost impossible to put out. One of the most famous such fires is in Centralia, Pennsylvania; it started in May 1962 when part of an abandoned strip mine being used as a garbage dump ignited. The flames spread through extensive coal seams, and even today, wisps of smoke emanate from the ground. Another long-running underground fire, nicknamed “the Gates of Hell,” erupted in 1971 when geologists in Turkmenistan accidentally drilled into a pocket of natural gas and then set it on fire. The world’s longest-burning fire, a coal seam blaze within Mount Wingen in New South Wales, Australia, has them all beat — it’s been burning for at least 5,000 years.

Interesting Facts
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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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Few animals get as much bad press as spiders. For something so tiny, it’s amazing how much we fear our eight-legged friends. But arachnids are far less dangerous and far more interesting than most people realize. Learning more about them might not make you love them, but it might help you appreciate them more — and relax a little the next time you find one in your house or garden.

A spider hiding on the inside of a leaf.
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Not All Spiders Make Webs

Spiders and webs are inseparable in our minds – what’s a Halloween decoration without both? In fact, only about half of all species of spiders make webs. The others catch their food without a web: Like other predators, they may either actively stalk their prey, or else wait hidden to pounce when it passes by. All spiders do make silk, though. They may just use it for other purposes, such as creating egg sacs or getting from place to place.

A look at a spiderweb found in a bush.
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Not All Spider Webs Look Like Stereotypical Spider Webs

The Halloween-decoration type of spider web – called an orb web — isn’t the only kind. In fact, it’s not even the most common. Spiders make at least three other kinds of webs. Sheet webs are what they sound like: The silk threads form something like a sheet of thin gossamer fabric. Unlike the orb web, this isn’t a sticky trap – it’s more like a net that catches insects as they fly, knocking them off-course so they fall to the spider waiting below. Some species make funnel-shaped webs, which can be used as hideaways or storage areas. And then there are cobwebs, which are a tangle of sticky silk.

A small spider hanging out in their web.
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Spiders Won’t Thank You for Putting Them Outside

Many of us don’t want spiders in our house, but don’t want to be spider-murderers either, so we catch them and put them outside. This might seem like a nice thing to do, but chances are you’re evicting that spider from its lifelong home. For many species of spiders, our houses are their natural habitat, and some won’t survive long outside it. In fact, your home is an ecosystem that supports a wide range of arthropods (the group that includes spiders and insects, among other creatures). One study of 50 homes in and around Raleigh, North Carolina, found species from 15 families of spiders, and one group, the cobweb spiders, were found in 100% of the houses studied.

Close-up of a spider in the hands of a human.
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The Vast Majority of Spiders Can’t Hurt You

If learning about all the spiders that share your house has freaked you out, don’t worry! Yes, almost all spiders use venom to subdue their prey, but out of the over 45,000 known species, only a handful pose any danger to humans. Since we’re much too big for them to eat, they usually have no reason to bite us, so spider bites are far less common than people think. In one case where researchers collected 2,055 brown recluse spiders from a home in Kansas, none of the residents had ever been bitten. In fact, the much-feared brown recluse only appears in the south-central U.S., so if you live anywhere else in the country, you can stop worrying. Of course, it’s still important to treat any spider you find with care.

Close-up of two spiders hanging out in a web.
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Some Spiders Are Social

Most spiders are solitary, but some species are social animals. They live together in shared webs or groups of webs, and some cooperate in hunting and even raising young. Large webs catch prey more effectively, and a group of spiders can subdue prey that is 10 times their body weight (a single spider can usually only handle something twice as big as itself). The large webs also provide shelter for the spiders and protection from their own predators. Colony sizes can be as small as a handful or as much as tens of thousands of individuals. Don’t fret, however — this isn’t the kind you’ll find in your house.

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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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Most writers go by their real name. From Dickens to Dostoevsky, Alcott to Asimov, the lion’s share of all-time greats have published their novels, stories, plays, and poems under true-to-life bylines. But not all of them. Many distinguished men and women of letters have used pseudonyms to accompany their works, and some are so ubiquitous that the public may not even know they’re a pen name. Here are five of the most notable cases and the stories behind them.

Mark Twain standing by a window in a 1907 portrait.
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Mark Twain

Samuel Langhorne Clemens went by many names. The author and humorist published a number of letters as Thomas Jefferson Snodgrass and a novel about Joan of Arc as Sieur Louis de Conte. There continues to be debate about the meaning behind “Mark Twain,” with some even suggesting that it involves his bar tab, but the most widely accepted theory involves the same Mississippi riverboats he made famous in The Adventures of Huckleberry Finn.

The precise etymology relates to the practice of depth sounding. “Twain” is an old way of saying “two,” and the phrase “by the mark twain” means that the mark on the rope suggests a depth of two fathoms. (A “fathom” is a maritime measurement that means six feet, so two fathoms equals 12 feet.) According to Twain — or, rather, Clemens — himself, he wasn’t the one who came up with the name: “Mark Twain was the nom de plume of one Captain Isaiah Sellers, who used to write river news over it for the New Orleans Picayune. He died in 1863 and as he could no longer need that signature, I laid violent hands upon it without asking permission of the proprietor’s remains. That is the history of the nom de plume I bear.”

Novelist Toni Morrison discusses her venture into playwriting in Albany.
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Toni Morrison

Not everyone with a pen name is happy about it. Case in point: Toni Morrison, née Chloe Ardelia Wofford. She started going by her saint’s name, Anthony, after converting to Catholicism at the age of 12, and the shorter “Toni” caught on soon after. Morrison, meanwhile, was her husband’s last name — but she’d already divorced him by the time she began her writing career. According to a 2012 New York Magazine profile, “to this day, she deeply regrets leaving that now world-famous name on her first novel, The Bluest Eye, in 1970.”

“Wasn’t that stupid?” she said. “People who call me Chloe are the people who know me best. Chloe writes the books.” She considered Chloe her true self, while Toni was the acclaimed author and Nobel laureate who did the press tours, the speeches, the “legacy and all of that.”

Portrait of J.K.Rowling.
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J.K. Rowling

Even as a muggle, J.K. Rowling has always had a few tricks up her sleeve when it comes to writing under an assumed name. And while it’s true that her real name is Joanne Rowling, the Harry Potter author doesn’t actually have a middle name. She chose J.K. because her publishers, fearful that the apparent target audience for a series about witchcraft and wizardry would be less inclined to read something written by a woman, asked her to use two initials. The “K” in this case stands for Kathleen, the first name of her paternal grandmother.

It doesn’t end there. After the enormous success of Harry Potter, Rowling wanted to try her hand at a different genre. She did so by publishing The Cuckoo’s Calling under the pseudonym Robert Galbraith in 2013, hopeful that her new endeavor could succeed on its own merits rather than ride Harry Potter’s coattails. And though the detective novel was warmly received by critics, it wasn’t until some amateur sleuths uncovered its true authorship that sales skyrocketed. Rowling — who has faced controversy and criticism recently for her transphobic stance — has said that she chose the name in honor of Robert Kennedy, a personal hero of hers, and has written four more books in the series as Galbraith.

A photo of George Orwell in front of a BBC microphone.
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George Orwell

Unlike many other pseudonymous writers, George Orwell isn’t especially well known as such. Best known for Nineteen Eighty-Four and Animal Farm, he was born Eric Arthur Blair in 1903 and opted for a pen name prior to the publication of his 1933 memoir Down and Out in Paris and London. It’s a powerful account of his time as an impoverished laborer in the two capital cities, and Orwell opted to publish under a pen name out of fear that it would embarrass his family. Several other options were considered: X, P.S. Burton, Kenneth Miles, and H. Lewis Allways. “George Orwell” won out both because he considered it a “good round English name” and because it evoked the River Orwell in England’s Suffolk County, which he lived near at the time and was extremely fond of.

Stephen King reads from his new fiction novel during the "Kennedy Library Forum Series".
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Stephen King

The master of horror has published 61 novels, from Carrie and It to The Shining and Pet Sematary, but only 54 of them are under his real name. The remaining seven are credited to Richard Bachman, King’s longtime nom de plume. Dating back to 1977, when the first of these Bachman works was released, the reasoning was simple: King was too prolific for his publishers. Conventional wisdom at the time, according to the FAQ page on his website, was that “one book a year was all the public would accept” and adopting a pen name “made it possible for me to do two books in one year.”

Before settling on Richard Bachman, King was originally partial to a name that “had gotten out on the grapevine” and was therefore unusable: Gus Pillsbury. His pen name is a combination of Richard Stark, one of whose novels King had on his desk while making his decision, and the band Bachman Turner Overdrive, whose song “You Ain’t Seen Nothin’ Yet” was playing at that same fateful moment.

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.

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Do you believe in ghosts? If you do, you have something in common with 46% of Americans — not to mention several Presidents. Harry Truman, Abraham Lincoln, and even Winston Churchill are among the world leaders who may or may not have had supernatural experiences at the White House, which was first built starting in 1792 and rebuilt in 1817 after the British burned it during the War of 1812. The White House has been called “the country’s most famous haunted house,” and with good reason — some even count a former POTUS among the supposed spirits in residence. Here are a few of the most famous ghosts rumored to haunt the Executive Mansion.

Abigail Adams, the wife of the second US President John Adams.
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First Lady, First Ghost

John Adams was the first President to live in the White House after its completion at the turn of the 19th century, making his wife, Abigail Adams, the first First Lady to reside there. According to some, she still does. Because the newly completed East Room was the warmest and driest in the building, Abigail used to hang her wash there. Many have reported seeing her in or near the East Room in the two centuries since, often with her arms outstretched as though still carrying laundry — not the most menacing activity, perhaps, but surely quite the shock when you’re in the middle of a walk-and-talk.

Tulips are shown in full bloom in the Rose Garden of the White House.
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A Rather Ghostly Rose Garden

Abigail Adams isn’t the only First Lady who’s said to have taken up permanent residence at 1600 Pennsylvania Avenue. Dolley Madison, who spent eight years there while her husband James served as President from 1809 to 1817, helped define the role of a presidential spouse and served as a model for future First Ladies. It would appear she was also quite protective of the Rose Garden. When two landscapers were tasked with moving the famous garden a century later at the behest of First Lady Edith Wilson, they apparently encountered Dolley’s angry ghost and abandoned their plans. The Rose Garden was never moved, and remains in the same spot to this day.

President Truman addresses the nation from his office in the White House.
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Harry Truman Hears Three Knocks

Not even leaders of the free world are immune to the effects of hearing scary sounds at night. Just ask Harry S. Truman, who was awakened by three knocks on his bedroom door at about 4 a.m. one morning in September 1946 and described the experience in a letter to his wife Bess. “I jumped up and put on my bathrobe, opened the door, and no one there,” he wrote. “Went out and looked up and down the hall, looked in your room and Margie’s. Still no one. Went back to bed after locking the doors and there were footsteps in your room whose door I’d left open. Jumped and looked and no one there! The damned place is haunted sure as shootin’. Secret Service said not even a watchman was up here at that hour.”

Truman’s letter concluded, “You and [daughter] Margie had better come back and protect me before some of these ghosts carry me off.”

Portrait of Mary Todd Lincoln.
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Mary Todd Lincoln’s Séances

Abraham and Mary Todd Lincoln experienced every parent’s worst nightmare when their 11-year-old son William, often called Willie, died of typhoid fever on February 20, 1862, in the White House. This was doubly tragic, as their son Edward had died about a month before his fourth birthday 12 years earlier. In her grief, Mary Todd began holding séances in the Red Room (some say she held as many as eight of these supernatural gatherings), and she apparently found them to be an effective coping mechanism. “Willie Lives,” she later told her half-sister. “He comes to me every night and stands at the foot of the bed with the same sweet adorable smile that he always has had. He does not always come alone. Little Eddie is sometimes with him.”

The Lincoln Bedroom, formerly the Blue Suite, in the White House.
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When Churchill Met Lincoln(’s Ghost)

Abraham Lincoln’s assassination is one of America’s defining historical events, and the trauma lasted long after his death. Our 16th — and, according to many rankings, best — President is the White House’s most famous ghost, having been sighted more than any other spirit. In a way, those sightings include a chilling prophecy Lincoln experienced himself. One evening early in 1865, Lincoln told his close friend Ward Hill Lamon of a troubling dream he’d had a week and a half earlier:

“I soon began to dream. There seemed to be a deathlike stillness about me. Then I heard subdued sobs, as if a number of people were weeping. I thought I left my bed and wandered downstairs … I arrived at the East Room. Before me was a catafalque [raised platform for a coffin], on which rested a corpse wrapped in funeral vestments. Around it were stationed soldiers who were acting as guards; and there was a throng of people, some gazing mournfully upon the corpse, whose face covered, others weeping pitifully. ‘Who is dead in the White House?’ I demanded of one of the soldiers. ‘The President,’ was his answer. ‘He was killed by an assassin.’”

Lincoln was assassinated just a few months later, and sightings of the fallen leader in the room now known as the Lincoln Bedroom began not long after. According to Jared Broach, founder of the ghost tour company Nightly Spirits, “They say Lincoln always comes back whenever he feels the country is in need or in peril. They say he just strides up and down the second-floor hallways and raps on doors and stands by windows.”

It isn’t just humans who have felt this presence. Rex Scouten, then the White House curator, said in 1989 that Ronald Reagan’s dog felt comfortable roaming through every room in the White House except the Lincoln Bedroom, where “he’d just stand outside the door and bark.”

No less a credible source than Winston Churchill himself reported encountering Lincoln’s ghost in that very room, albeit under different circumstances. He had just stepped out of the bath and was “wearing” nothing but a cigar when he saw the former President by the fireplace. “Good evening, Mr. President,” Churchill reportedly said. “You seem to have me at a disadvantage.” Indeed he did, but it’s hard to imagine anyone else being so witty in that moment.

 

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.

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Have you ever set foot in Cambria? Wondering where you’ll find the Land of Noah on a map? Nations in various corners of the globe are often known by different names for a variety of historical, cultural, or political reasons. Check out these alternate country names that you might never have encountered before.

Aerial view from Constitution Hill over Aberystwyth, the sea and Welsh Coast of Wales.
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Cambria (Wales)

For most people, the small nation set on the southwestern coast of Great Britain is known as Wales, but others call it Cambria. While many historians agree that Cambria is the Latinized spelling of the Welsh name Cymru, some also point to the legend of the Trojan hero Brutus. In his 12th-century chronicle The History of the Kings of Britain, the cleric Geoffrey of Monmouth references Brutus landing in Britain and becoming its first king. Brutus changed the island’s name from Albion to Britannia and split it into three kingdoms, one for each of his sons. Locrinus received Logres (England), Albanactus was given Albany (Scotland), and Camber got Cambria (Wales).

The moniker Cambria survives in the names of Welsh landmarks and tourist attractions. Among them are the Cambrian Mountains and the Cambrian Line scenic railway, which crosses them. Hikers can trek nearly 300 miles from Cardiff to Conwy via the Cambrian Way trail. Cambria is also referenced in “Men of Harlech,” a military song that retells the events of a siege of Harlech Castle in the 1460s.

Map and flag of Finland.
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Suomi (Finland)

Tune into the Olympics or watch an international ice hockey match and you might see uniforms with the word “Suomi.” This is the Finnish name for Finland, the Northern European country known for thousands of lakes, the northern lights, and the wilderness of Lapland. The word’s origins are unclear, but there are a number of hypotheses. One suggests that it comes from suomma, which translates to “swampland,” and could relate to an ancient belief that the nation’s lakes were once swamps. An alternate theory considers the word suomo (“fish scale”) and implies that the Finnish people made clothes from fish skin. Some linguists speculate that the words Suomi and Sami — which refer to the native peoples of Finland, Norway, and Sweden — are derivations of zeme, a Proto-Baltic word for land or territory.

Travel to Finland and you’ll hear most Finns proudly refer to their nation and language as Suomi. In fact, Finland wasn’t a name invented by the Finnish; instead, it likely comes from the Old English word finna, once used to describe Scandinavian people. Interestingly, the letter “f” didn’t even exist in the Finnish alphabet, and was introduced through words borrowed from other languages .

Ancient monastery in Armenia.
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Land of Noah (Armenia)

Armenia, the landlocked nation in the Caucasus region between Europe and Asia, is also known as the Land of Noah. The nickname stems from an extract in the Book of Genesis that states, “On the seventeenth day of the seventh month the ark came to rest on the mountains of Ararat.” It refers to Noah’s Ark and Mount Ararat, the first mountain that rose above the waters after the Great Flood. Although not located in Armenian territory today (it’s now in Turkey), Mount Ararat is a national symbol and revered by Armenians. It’s featured on the nation’s banknotes and coat of arms, which portrays Noah’s Ark on the mountaintop.  

The Land of Noah’s biblical connections run deeper than the rumored resting place of the ark, however. Hayk, who claimed to be the great-great-grandson of Noah, is the forefather and founder of the first Armenian kingdom. In 301 CE, it became the world’s first country to adopt Christianity as the official state religion.

Landscape view of the town of Mestia in the Sakartvelo Mountains in the country Georgia.
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Sakartvelo (Georgia)

If you ever visit Sakartvelo, you’d find yourself in a nation that stretches from the eastern shoreline of the Black Sea across the Caucasus Mountains. To much of the world this country is known by its western name of Georgia, but to Georgians themselves, it is Sakartvelo. This native name translates to “Land of Kartvelians,” and refers to the people who inhabited the country’s central region of Kartli. One of the first documented uses of Sakartvelo is found in the ancient Georgian Chronicles, and by the 1200s it referred to the entire unified medieval Kingdom of Georgia.

So why is the country widely known as Georgia? Some argue that it derives from gurgan, the Persian term for Georgians, while others say that it represents the native’s enthusiasm for St. George, or that it comes from a Greek word that means “tiller of the land.” Throughout much of the former Russian Empire, the country goes by the name Gruziya.

Colorful houses and shops along the waterfront at the port of St John`s, Antigua and Barbuda.
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Wadadli (Antigua)

Antigua and Barbuda is an independent Commonwealth country located in the Caribbean, known for its pristine beaches and verdant rainforests. The country is made up of two islands, the lively and populated Antigua and the quieter Barbuda. Upon seeing Antigua for the first time in 1493, Christopher Columbus named the island Santa Maria de la Antigua after the miraculous virgin of a namesake chapel in Seville, Spain. Antiguans, however, call their island by its native Carib name of Wadadli. The name is associated with wadli, the Indigenous word for “oil,” and appeared in the 17th-century dictionary of the missionary Father Breton. The story goes that Dominican Caribs traveled to Antigua and collected oil to be utilized in medicines and as lighter fluid.

Visit one of Antigua’s dozens of beachfront bars and restaurants and there’s a good chance that you’ll find Wadadli lager beer and Wadadli Premium Gold on the menu. The soundtrack to a blissed-out Caribbean vacation is often the reggae beats of the Wadadli Experience Band — Antigua and Barbuda’s first Rastafarian band.

Interesting Facts
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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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Ordering a coffee can be surprisingly intimidating. Dark roast? Espresso? House blend? If you’re not familiar with the coffee brewing process, it’s easy to sideline a cup of java for a tea or cocoa instead. But this quick guide to coffee roasts will perk up your coffee knowledge and help get your drive-thru order down, stat.

Close-up of harvesting coffee berries.
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How Is Coffee Roasted?

There are many types of coffee, but two uber-popular commercial varieties dominate the coffee market — arabica and robusta. Arabica coffees are most sought-after for their mild, balanced flavor, while bitter robusta coffees are used for cheaper blends, instant coffees, and some espressos. There are noticeable differences between these two common varieties, but beans from both species generally have the same origin story from coffee farm to roasting (and later, your cup).

Coffee farms are most commonly found along the equator, aptly named the Bean Belt, where young coffee trees take three to five years to produce their first fruit. The fruits, known as coffee cherries, are typically harvested by hand once or twice a year before being dried by the sun or in large, tumbling dryers. The beans of the fruit are then milled — a process that removes the dried cherry husk and leaves behind the green coffee bean that’s sold to coffee roasters.

Behind the scenes at a commercial roaster, the green beans are dumped into a churning roaster that keeps them moving while they’re heated to temps between 350 and 450 degrees. Prolonged heat causes the beans to undergo a Maillard reaction, a chemical process where amino acids and sugars in the beans cause browning and flavor development. It happens quickly — beans generally transform in less than 20 minutes, though the length and temperature of the roast determine how many times the Maillard reaction occurs and how the final cup of coffee will taste. Accuracy is essential during roasting because beans quickly brown along the roasting spectrum; overcooking coffee beans can happen within a matter of seconds.

3 Levels of roasted coffee beans are ready for brew.
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How Are Light, Medium, and Dark Roasts Different?

While coffee beans are dried before roasting, they still have some moisture content, which plays a large role in how the finished cup of coffee will taste. Roasting removes much of that excess water, unlocking the beans’ oils and flavors. Light-roast coffees generally spend the shortest amount of time in a roaster at lower temperatures, leaving behind much of the beans’ water content for a mild, bright, and fruity flavor. Dark-roast coffees are roasted longer at higher temperatures, removing most of the beans’ water content for a richer, nuttier, and more bitter taste. High temperatures also pull out the beans’ natural oils, leaving a sheen at the top of your coffee pour that thickens the drink. Medium roasts fall midway on the coffee spectrum and generally blend the brightness of light-roast coffee with the depth of a darker roast.

Fresh hot coffee being poured into a cup from a stainless steel french press.
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Does Roasting Change Caffeine Levels?

Your selected roast does have an impact on caffeine, but it may not be what you expect. While some coffee drinkers swear by a dark roast’s ability to perk them up, caffeine doesn’t drastically increase or decrease during roasting. The difference lies in the amount of bean measured out for grinding and brewing. Light-roast beans hold onto their moisture and size when heated, while dark roasts lose most of their water and weigh less, but they puff up in size. When beans are measured in equal volumes — for example, with a one-cup scoop — light-roast coffees contain more caffeine simply because more of the smaller, light-roast beans fit into a scoop than the larger dark-roast beans. So while light-roast coffees often seem to have more caffeine, it’s only because more beans are used to brew a fresh pot in comparison to dark roasts.

There is a difference in caffeine between arabica and robusta coffee blends, however. If you’re given the option, know that robustas have almost twice the amount of caffeine of arabicas, so regardless of which roast you choose, your nervous system may be in for a shock.

Closeup shot of an espresso maker pouring espresso into a cup.
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What Roasts Are Used for Specialty Coffee Drinks?

Crafted coffee drinks, such as lattes and cappuccinos, often rely on medium to dark roasts to balance out the flavors of milk. Espresso is generally made from dark roasts to create a balanced, less acidic taste, but espresso-specific roasts also exist. (Espresso is made by forcing pressurized water through pressed grounds rather than through a gravity drip, so the flavor is generally stronger.) Experimenting with different specialty drinks during your next coffee run can help you hone in on your preferred roast, but if you can’t quite find the flavor you’re seeking, you can always try roasting and grinding your own beans at home.

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.

Interesting Facts

Our lives are full of little mysteries. Why is the week seven days long? Why aren’t you supposed to put your elbows on the table? Why does toothpaste make orange juice taste terrible? And then there’s every kid’s favorite: Why is the sky blue? We’ve rounded up the answers to some of these quotidian questions, as well as a few weirder head-scratchers, from around the website. Reading the results should arm you with some answers as you go about your day — and help you prepare for the next time you encounter a curious kid.

An empty movie theater interior with blank screen.
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Why Are Movie Previews Called “Trailers”?

Movie previews are called “trailers” because they were originally shown after the movie. In the early days of moviegoing, you didn’t just buy a ticket for one feature-length film and leave once the credits started rolling. You were instead treated to a mix of shorts, newsreels, cartoons, and, eventually, trailers — which, per their name, played after the movie rather than before — with people coming and going throughout the day. The idea for trailers came from Nils Granlund, who in addition to being a business manager for movie theaters worked as a producer on Broadway, which explains why the first trailer was actually for a play: 1913’s The Pleasure Seekers. Today there are production houses that exclusively make trailers and are handsomely rewarded for their efforts, sometimes to the tune of millions of dollars.

A cat looks at the camera.
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Why Does Catnip Make Cats High?

About 70% of cats are susceptible to the intoxicating effects of nepetalactone, the active compound in catnip. One whiff and these kitties are temporarily reduced to drooling, meowing messes, often rolling around in or rubbing their faces on the catnip source. That’s because nepetalactone is a volatile organic molecule that binds to receptors in a cat’s nose, stimulating neurons that activate the olfactory bulb, amygdala, hypothalamus, and other areas of the brain, causing a euphoric effect. The buzz seems to wear off after 10 to 15 minutes, leaving cats extremely chill thereafter.

A hand slicing bread.
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Why Do We Say “the Best Thing Since Sliced Bread”?

In 1928, when inventor Otto Frederick Rohwedder of Davenport, Iowa, first released his bread loaf-slicing invention, the advertisement claimed it was “the greatest forward step in the baking industry since bread was wrapped.” Riffing on the theme, customers began to compare all later inventions to his, and the modern idiom evolved from there.  

A row of white wedding dresses on rack.
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Why Do Brides Wear White?

Walk through any bridal shop and it’s obvious that white wedding dresses are the norm, but that wasn’t always the case. Historically, brides often repurposed their best dress as their wedding gown, and most were not white — specifically because white was exceptionally difficult to keep clean prior to modern washing machines and stain removers. Queen Victoria, who wore a lacy white gown at her 1840 wedding in place of the then-popular red, is often credited for popularizing bridal white (though Mary, Queen of Scots wore white during her 1558 Notre Dame wedding, and many lesser-known royals did before Victoria’s reign). Within a decade of Victoria’s wedding, dressmakers and etiquette books had run with the idea that white was virginal and pure, with the popular Godey’s Lady’s Book writing that a white dress was “an emblem of the innocence and purity of girlhood, and the unsullied heart which she now yields to the keeping of the chosen one.”

A hand marks a date on a calendar.
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Why Is a Week Seven Days?

The seven-day week is a timekeeping oddity. Unlike days, months, and years, the week doesn’t align with any celestial reality, and it doesn’t divide elegantly into existing periods of time. For example, there aren’t 52 weeks in an average year — there are 52.1428571429. So how did this happen? Babylonians, the ancient superpower of Mesopotamia, put a lot of stock in the number seven thanks to the seven observable celestial bodies in the night sky — the sun, moon, Mercury, Venus, Mars, Jupiter, and Saturn. This formed the seven-day week, which was adopted by the Jewish people, who were captives of the Babylonians in the sixth century BCE. Eventually, it spread to ancient Greece and elsewhere thanks to the battle-happy Macedonian Alexander the Great. Efforts have been made throughout history to reform the seven-day week, but this oddball unit of time has become ingrained in many religions, including Judaism, Christianity, and Islam, rendering any sort of tweak pretty unlikely.

A green field with a blue sky in the background.
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Why Is the Sky Blue?

Think about the atmosphere as a prism. In a prism, white light refracts through its polished surfaces and separates into the colors of the rainbow. The sun produces white light, so when its light travels through the atmosphere, it refracts a rainbow of colors. Each color comes from an electromagnetic wave. While red has the longest, slowest wavelength, blue and violet move in quick, short waves. As these colors pass through the atmosphere, they oscillate charged particles in air molecules like oxygen and nitrogen. Blue and violet are scattered in all directions at around 10 times the efficiency of red light, so they get the highest coverage area in our sky. Our eyes are more sensitive to blue than violet, which is why we see the sky as blue.

A hand with a finger pointing.
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Why Is It Considered Rude to Point at Another Person?

When assisting theme park guests, Disney employees are trained to point with two conjoined fingers, index and middle. While the act reportedly doubles as a nod to Walt Disney’s smoking, the larger explanation is that standard pointing is considered rude in numerous cultures — especially if aimed at another person. A perception that dates back to Shakespeare’s time suggests pointing brings unwanted attention to the recipient, implying that they’ve committed a wrong. Repeated pointing in Japan can even instigate hostility. And figurative “finger-pointing” is defined as “making explicit and often unfair accusations of blame.” In situations where you feel compelled to point, it is kinder to use an open palm, flight attendant-style.      

A woman picks up a cupcake from the floor.
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Is the “Five-Second Rule” Real?

Most people know the “five-second rule”: the idea that if food that’s fallen on the floor has been there less than five seconds, it’s still acceptable to eat. No one knows the origins of this questionable rule — and plenty of people think it’s kind of gross — but that hasn’t stopped anyone from picking up a dropped Oreo and shouting “five-second rule!” before.

Actual scientists have devoted time and resources to testing the five-second rule. And surprisingly, it’s not an entirely bogus theory — depending on the cleanliness of the floor. To be clear, no scientist has gone on record recommending that you eat dropped food. However, a science experiment conducted at the University of Illinois Urbana-Champaign proved that as long as the food was picked up within the five-second time limit, the presence of microorganisms on the dropped food was minimal. However, the experiment was conducted after first sanitizing the flooring, and it only applied to hard flooring like tile and wood, which are less likely to serve as an incubator for pathogens. No testing was conducted on carpeting and other soft surfaces, which can hold moisture and become breeding grounds for bacteria. In any case, it’s definitely not recommended to blindly follow the five-second rule. You have no way of knowing which pathogens are on your floor, so unless you regularly disinfect, it’s best to play it safe and follow another rule: When in doubt, toss it out.

A row of passengers on a plane.
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Why Is It So Cold on Airplanes?

Passengers often complain about the cold temperature in airplane cabins. Flight staff will provide passengers with a blanket, but they don’t ever increase the heat. That’s because the temperature on an aircraft has been set in a very intentional way — and it’s for your safety.

A study by ATSM International found that people were more likely to faint on an aircraft than on the ground due to a condition called hypoxia. The pressurized environment of an airplane cabin can prevent our body from getting enough oxygen, which causes fainting. The warmer the temperature onboard the aircraft, the more likely this is to happen. To prevent passengers from passing out, airlines intentionally lower the cabin temperature. While this might be slightly uncomfortable, it’s much safer for your body.

An aerial view of New York City on a summer day.
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Why Is New York Called “the Big Apple”?

Before it was used to refer to the city that never sleeps, “big apple” was an idiom used to mean a very big deal, an object of great desire or big dreams. The first time New York City was referred to as a “big apple” in print may have been in 1909, when American journalist Edward S. Martin wrote in his book The Wayfarer in New York that those in the Midwest are “apt to see in New York a greedy city … it inclines to think that the big apple gets a disproportionate share of the national sap.” The phrase doesn’t seem to have been intended as a nickname, however.

It was actually a horse-racing column published by the New York Morning Telegraph that popularized the term. “The dream of every lad that ever threw a leg over a thoroughbred and the goal of all horsemen. There’s only one Big Apple. That’s New York,” racing journalist John J. Fitz Gerald wrote in a 1924 column eventually called “Around the Big Apple.” However, Fitz Gerald apparently first heard the term from two Black stable hands in New Orleans. As etymologist Michael Quinion explains, “the Big Apple was the New York racetracks … the goal of every aspiring jockey and trainer … for those New Orleans stable hands the New York racing scene was a supreme opportunity, like an attractive big red apple.” The expression was later further popularized by jazz musicians in the 1920s and 1930s, then picked up in the 1970s by Charles Gillett, president of the New York Convention and Visitors Bureau, who began a tourism campaign around the slogan.

Fresh produce at the grocery store.
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Why Do They Mist Produce at the Grocery Store?

Many grocery stores display produce in open cases fitted with tiny jets to periodically bathe the veggies in a cool mist. (Some supermarkets even pipe in the sound of thundering rain to add to the rainy vibe.) The purpose behind misting is not to keep produce clean or extend its shelf life — it’s a clever way for grocers to make the fruits and vegetables look fresher and healthier so consumers purchase more. Water clinging to leafy greens also adds weight, which increases revenue for the store when vegetables are sold by the pound.

Ironically, misting actually shortens produce’s shelf life because water allows bacteria and mold to take hold. Misted veggies will likely not last as long in your fridge as those that weren’t misted in the produce aisle — which is another, perhaps sneakier, way to get you to buy produce more often.

A mother and son duo jump on a couch.
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What’s the Difference Between a Couch and a Sofa?

Though usually used interchangeably, these are technically two different pieces of furniture — and the distinction lies in the words themselves. “Couch” comes to us from French, namely coucher — “to lie down” — whereas we have the Arabic word suffah to thank for “sofa.” In the most traditional sense, a sofa would be a wooden bench that comes complete with blankets and cushions and is intended for sitting. eBay’s selling guide used to distinguish between the two by defining a couch as “a piece of furniture with no arms used for lying.” Though it may be a distinction without a difference these days, purists tend to think of sofas as a bit more formal and couches as something you’d take a nap on and let your pets hang out on.

One blue, one pink onesie hanging on a linen rod.
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Why Is Pink Considered a Color for Girls, and Blue for Boys?

Originally, it was actually the other way around. For much of the 19th century, most infants and toddlers wore white dresses. Dresses facilitated diaper-changing, and white cotton could easily be cleaned with bleach. But around 1900, childcare experts began to push for a greater distinction between little girls and boys, amid fears that boys were growing up “weaker” and “lazier” than their fathers had. Many U.S. publications and stores responded in part by recommending pink clothing for boys and blue clothing for girls, although some also recommended the opposite color scheme. According to Dressmaker magazine, “Blue is reserved for girls as it is considered paler, and the more dainty of the two colors, and pink is thought to be stronger (akin to red).”

But around World War II, everything changed. Soon pink was heavily marketed as the preferred color for girls, and blue for boys. It’s not entirely clear what led to the switch, and the colors chosen were somewhat arbitrary — the focus was primarily on creating clothes specific for each child in an attempt to curb hand-me-downs, and thus sell more product. Once the 1950s began, hospitals wrapped newborns in pink or blue blankets, based on their sex (today’s standard blankets contain pink and blue stripes).

A person scans a QR code.
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What Does the “QR” in “QR Code” Mean?

QR codes are those pixelated-looking black-and-white squares that you can scan with your phone for more information about something, whether it’s an advertisement or a piece of art. They’ve become ubiquitous, especially after the COVID-19 pandemic popularized contactless menus and payment. However, they’re very rarely called by their full name. “QR” actually stands for “quick response,” and the codes can be used to share far more than a link. If you wanted to, you could share an entire book with one code. The technology was first developed by a Toyota subsidiary in the mid-’90s as a way to track auto parts, but QR codes found new life as a way to direct smartphone users from a physical space to a digital one. They used to require a special reader, but nowadays, most smartphone camera apps will read QR codes on their own.

A close-up of a woman's elbows on a table.
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Why Are You Supposed to Keep Your Elbows Off the Table?

In the Old Testament, the Book of Ecclesiastes includes the line, “Be ashamed of breaking an oath or a covenant, and of stretching your elbow at dinner.” Many have translated this directive as a warning to keep elbows off the table at all times. Table manners were originally introduced to prevent mealtime fights, with the knife and fork establishing each eater’s boundary lines. Today, the elbow rule stops people from slouching or accidentally leaning their arms into food dishes. Moreover, when breaking bread with a group, placing your elbows on the table blocks those on either side of you from making eye contact.

A woman cuts a white onion on a cutting board.
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Why Do You Cry When You Cut Onions?

There’s no need to cry over spilled milk, but what about chopped onions? You can thank a chemical combination of enzymes and sulfur for the tears that well up while you make dinner. Onions use sulfur to make a mixture of amino acids and enzymes during the growing process. The acids and enzymes are separated and stored in different regions of the onion’s cells, which are called vacuoles. While the onion remains whole, the amino acids and enzymes in the onion’s cells remain separated. Once you cut into the onion, however, everything mixes together. When the two substances are combined, they form a chemical known as syn-Propanethial-S-oxide, or lachrymatory factor (LF). LF is an irritant that’s easily vaporized when it reacts with the air.

LF isn’t strong enough to affect tougher parts of your body such as your skin, but it can irritate more sensitive regions. As the vapors waft up toward your face, your eyes will begin to sting. Your body — sensing the irritant — will release a torrent of tears in an attempt to wash the chemicals from your eyes. Luckily, LF can’t do any serious damage, even in high quantities.

Producing LF is the onion’s way of defending against anything that may want to eat it. As soon as an animal bites into the root, its eyes start to burn and it’s reminded to stay away from onions. Unfortunately for onions, humans are persistent.

A small calendar and alarm clock on a table.
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Why Is February the Shortest Month of the Year?

February has fewer days because of the superstitions of ancient Rome. In the late eighth century BCE, Romans — including their king Numa Pompilius — held a superstition that even numbers were somehow unlucky. Although he created a version of a 12-month calendar, Pompilius realized there was no mathematical way for every month to have an odd number of days and for the total number of days in the year to also be odd. So while the other months were either 29 or 31 days long, February became the unlucky month to have only 28 days, making Pompilius’ calendar the apparently-less-scary number of 355.

In 45 BCE, Caesar — disregarding Pompilius’ fear of even numbers — added days to a number of other months, but not February. Some experts believe Caesar didn’t want to disrupt the important festivals that took place in that month and so he just let it be. But with the introduction of the Julian calendar, February did receive a consolation prize in the form of an additional day every four years.

A little girl compares her height to an imaginary giraffe.
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What Are the Tallest Beings in the World?

With a narrow range stretching for about 450 miles, from Big Sur to southern Oregon, coast redwoods (Sequoia sempervirens) are the tallest living beings in the world — and one in particular surpasses them all. Named after a titan in Greek mythology and found in California’s Redwood National Park, Hyperion stands 380 feet tall. That’s 65 feet taller than London’s Big Ben and 10 feet taller than the previous record holder, another coast redwood.

A kitten makes biscuits on bedding.
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Why Do Cats “Make Biscuits”?

A nursing kitten often presses its mom’s belly with its front paws; this kneading action stimulates the flow of milk. But many full-grown cats continue the behavior, “making biscuits” on pillows, soft blankets, towels, or their owners. Veterinarians think adult cats knead when they’re feeling safe and relaxed and to show affection to humans and other cats. The act of kneading can also calm cats, like a form of feline self-care. Making biscuits may also be a sign that a cat is marking its territory with the scent glands located between its toes.

A hand holds a basket of fresh sweet potatoes.
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Are Sweet Potatoes Really Potatoes?

Sweet potatoes and common potatoes share part of a name, but the two are entirely different plants — and sweet potatoes aren’t even potatoes. Sweet potatoes belong to the Convolvulaceae family, a group of flowering plants that’s also called the morning glory family. Potatoes belong to the nightshade (Solanaceae) family, and are cousins to peppers, tomatoes, and eggplants. Both species get their name from an Indigenous Caribbean term, batata, which eventually morphed into the English “potato.” By the 1740s, “sweet” was added to the orange-fleshed tuber’s name to differentiate the two root crops.

Then there are yams. Although they’re often served interchangeably with sweet potatoes, this third root crop is biologically unrelated to either sweet potatoes or common potatoes. These tubers belong to the Dioscoreacea family, a group of flowering plants usually cultivated in tropical areas. Luckily, you don’t have to know their scientific classification to distinguish between the two non-spuds at the grocery store: Sweet potatoes have tapered ends and relatively smooth skin, while true yams are generally larger with rough bark and a more cylindrical shape. At most U.S. grocery stores, what you’re seeing labeled as a yam is probably actually a sweet potato.

A bull stands in an arena.
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Does the Color Red Really Make Bulls Mad?

No — bulls can’t actually see the color. As is the case with other cattle and grazing animals such as sheep and horses, bulls’ eyes have two types of color receptor cells (as opposed to the three types that humans have) and are most attuned to yellows, greens, blues, and purples. This condition, a kind of colorblindness known as dichromatism, makes a bullfighter’s muleta (red cape) look yellowish-gray to the animals.

So why are bulls enraged by the sight of matadors waving their muletas? The answer is simple: motion. The muleta isn’t even brought out until the third and final stage of a bullfight. The reason it’s red is a little unsavory — it’s actually because the color masks bloodstains. In 2007, the TV show MythBusters even devoted a segment to the idea that bulls are angered by the color red, finding zero evidence that the charging animals care what color is being waved at them and ample evidence that sudden movements are what really aggravate the poor creatures.

A hand knocks on wood.
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Why Do We Say “Knock on Wood”?

In the United States, we say “knock on wood” (in the U.K., it’s “touch wood”) in a variety of situations, like after mentioning something we hope will happen. It’s a means of averting misfortune, making sure we don’t “tempt fate.” Some explanations for the practice mention a Celtic or otherwise pagan association with tree spirits, the idea being that knocking on wood (particularly once-sacred trees like oak and ash) might awaken these deities and confer their protection. Others note a Christian association with the wood of the cross.

But the origins of this practice are probably much more modern. In A Dictionary of English Folklore, scholars Jacqueline Simpson and Steve Roud note that the earliest known reference to the practice only dates to 1805. It seems linked to 19th-century children’s games like “Tiggy Touchwood” — types of tag in which children were safe from capture if they touched something wooden, like a door or tree. In his book The Lore of the Playground, Roud writes: “Given that the game was concerned with ‘protection,’ and was well known to adults as well as children, it is almost certainly the origin of our modern superstitious practice of saying, ‘Touch wood.’ The claim that the latter goes back to when we believed in tree spirits is complete nonsense.”

A glass of freshly squeezed orange juice with slices.
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Why Does Toothpaste Make Orange Juice Taste Terrible?

Most of us have endured this unpleasant situation at least once. The culprit is a toothpaste ingredient called sodium lauryl sulfate (SLS), which produces the foam that builds during vigorous brushing. Unfortunately, SLS also temporarily blocks the tongue’s sweet receptors, while simultaneously destroying the compounds in saliva that suppress our bitter receptors. The result is a double-whammy for our sensitive taste buds, which leaves us to taste only the unsavory citric acid from what would otherwise be a refreshing drink.

A woman and man having a conversation.
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Where Did the Phrase “Devil’s Advocate” Come From?

The term “devil’s advocate” is a familiar label for someone who argues a position they don’t agree with just to make a point, but its origins are more literal than you might expect. In 1587, Pope Sixtus V established the position of advocatus diaboli, or “devil’s advocate,” as part of the process of beatification or canonization — aka becoming a saint. The devil’s advocate was the church’s skeptic, picking apart stories of reported “miracles” and more to argue against someone’s sainthood. The advocate had to be present for any part of the sainthood process to be considered valid. However, the title was primarily a popular moniker — the position’s official designation was the “promoter of the faith,” or promotor fidei.

A man deposits a coin into a pink piggybank.
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What’s the Most Expensive Item Ever Made by Humans?

The most expensive movie ever made is Pirates of the Caribbean: On Stranger Tides, which cost a whopping $410 million. That’s a pretty penny to be sure, but it’s less than half a percent of the most expensive human-made object in history: the International Space Station, whose price tag comes in at $100 billion. Launched in 1998 after more than a decade of careful (and often difficult) planning, the ISS is a collaboration between five space agencies: NASA (United States), Roscosmos (Russia), JAXA (Japan), ESA (Europe), and CSA (Canada). It has been continuously occupied since 2000, with a full-time international crew conducting microgravity experiments and other research.

Feature image credit: Illustration by Diana Gerstacker; Photo by Jake Hills/ Unsplash

Interesting Facts
Editorial

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

Original photo by holwichaikawee/ iStock

The Wizard of Oz — L. Frank Baum’s book and the beloved 1939 film it inspired — is a quintessentially American fairy tale. It features the hallmarks of a Brothers Grimm story, with a young adventurous child bumping into wizards, witches, and talking animals. Yet it transports these classic conventions to scenes of middle America, a place of scarecrows, prairies, and hot air balloons. All of this imagery is neatly wrapped into a reflection on the American dream, or the idea that brains, heart, and courage — combined with hard work — can help you reach what you desire. Even when that desire is simply to go back home.

A Still with the main characters and wicked witch from the Wizard of Oz movie.
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The Wizard of Oz Canon Is Huge

Author L. Frank Baum wrote 14 books about the magical land of Oz, beginning with The Wonderful Wizard of Oz, published in 1900, and continuing with later titles such as Ozma of Oz, Tik-Tok of Oz, and Rinkitink in Oz. Many of the novels were published in yearly installments around Christmas. After Baum died in 1919, a new children’s author — Ruth Plumly Thompson — took up the mantle and wrote another 21 Oz sequels.

Baum May Have Named Oz After a Piece of Office Furniture

“I have a little cabinet letter file on my desk in front of me,” Baum told the St. Louis Republic in 1903. “I was thinking and wondering about a title for my story, and I had settled on ‘Wizard’ as part of it. My gaze was caught by the gilt letters on the three drawers of the cabinet. The first was A-G; the next drawer was labeled H-N; and on the last were the letters O-Z. And Oz it at once became.” (Some researchers suspect Baum was joking here.)

A photo of a brick road with grass hedges on each side.
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Many Places Claim To Be Home of the Original Yellow Brick Road

In the late 19th century, yellow brick roads were relatively common. (The color is caused by a low iron content, plus high levels of lime.) So it’s no surprise that many places claim to have inspired Oz’s most famous roadway. Purported locations include Peekskill, New York (where Baum attended a military academy) and Ithaca, New York (where Baum’s wife, Maud, attended college). Baum’s son argued the fictional path took after the cobblestone roads of Holland, Michigan, where his father summered. Other claimants include Dallas, Chicago, and Aberdeen, South Dakota.

The Character of Dorothy Was Particularly Special to the Baum Family

It’s likely that Baum named the book’s protagonist after his niece, Dorothy Louise Gage, who died in infancy in late 1898. Baum’s wife, Maud, adored the little girl and was so upset by the loss that she needed medical help upon returning from the funeral. It’s believed Baum wrote Dorothy into the story as a way of keeping his niece’s memory alive.

The Oz Universe Predicted Cellular Phones

Baum wrote dozens of other novels and short stories, and he had a knack for predicting an impressive number of inventions in his books: the taser, digital calendars, and defibrillators to name a few. In his novel The Master Key, a character even discovers an augmented reality gadget that predates Pokémon GO by a century. But Baum’s most notable prediction comes in Ozma of Oz:

Shaggy … drew from his pocket a tiny instrument which he placed against his ear.

Ozma, observing this action in her Magic Picture, at once caught up a similar instrument from a table beside her and held it to her own ear. The two instruments recorded the same delicate vibrations of sound and formed a wireless telephone, an invention of the Wizard.

A movie still of the Tin Man from Wizard of Oz.
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The Tin Man Contains Political Overtones

The book and movie contain other topical references often lost on modern audiences. The book’s Tin Woodman, for example, was a trope in political cartoons of the late 19th century. These “tin people” were a political allegory criticizing the abuses of unfettered capitalism: A symbol of the human worker treated as a machine. While it’s no surprise that Baum evoked imagery commonly seen in mass media at the time, it is surprising how pointed his commentary is. After all, what does the Tin Man — a figure that represents the dehumanization of industry — desperately search for? A heart.

The Book Contains a Slick Sales Pitch

Before he was writing books and short stories, Baum was working as a traveling salesman for his family’s oil company. The corporation’s No. 1 product was an axle oil called “Baum’s Castorine,” which was advertised as being “so smooth it makes the horses laugh.” It’s in this context that the Tin Woodman (or Tin Man, as he’s called in the film) was likely invented. When Dorothy meets the Tin Man, he badly needs a can of lubricating oil. It’s almost as if Baum couldn’t help himself from making one last sales pitch!

The Wizard Was Partly Inspired by an American Robber Baron

The Baum family did not get along with John D. Rockefeller of Standard Oil, whose unscrupulous attempts to squeeze his competitors out of business were, to say the least, not appreciated. As a result, Baum loved poking fun at the oil tycoon. The character of the Wizard, in some ways, is actually a reflection of Rockefeller: A terrifyingly powerful figure who possesses an outsize control of the world around him (but who is, when all is said and done, merely human).

In fact, the wizard’s appearance — “a little old man, with a bald head and a wrinkled face” — may be a cruel joke pointed at Rockefeller, who suffered extremely embarrassing hair loss from alopecia. Other references to Rockefeller are even more explicit. In an early stage adaptation of The Wonderful Wizard of Oz, a rusty Tim Woodman imagines a world without oil. The Scarecrow replies: “You wouldn’t be as badly off as John D. Rockefeller.”

A photo of a theater sign that reads 'stage door'.
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Oz Went to Broadway Immediately

Baum was determined to turn The Wonderful Wizard of Oz into a stage musical. Starting in 1902 — just two years after the original story’s publication — a wildly successful production would open in Chicago, play on Broadway, and tour across the United States. The stage version, however, departed heavily from Baum’s book. It was aimed at an adult audience and was stuffed with explicit political references. It added new characters, including a waitress and a streetcar operator. Toto was replaced by a cow named Imogene. And the Wicked Witch of the West? She’s nowhere to be seen.

Baum Was a Proto-Disney

Decades before Walt Disney ever dreamt of Disneyland, Baum was already talking about building a magical “Land of Oz” amusement park near San Diego, California. The theme park’s advisory board was reportedly going to be run entirely by children. Baum’s idea never materialized, but an Oz-themed park did exist in North Carolina in the 1970s (and reopens occasionally now).

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The 1939 Film Was Not the First Time Oz Had Seen the Silver Screen

In 1910, with the rise of silent film, the Selig Polyscope Company made the first film version of The Wonderful Wizard of Oz. (Watch the 13-minute film here.) Then in 1925, six years after Baum’s death, another silent adaptation was released loosely based on the book. This effort was, by all objective measures, awful — but it did feature Oliver Hardy as the Tin Man, roughly two years before he paired up with Stan Laurel and became a household name.

The 1939 Film Made Many Changes to the Book

The famous 1939 film, produced by MGM, shows significantly more fidelity to Baum’s book. However, there are a few notable discrepancies. In the book, for instance, Oz is a real place. But the movie treats it as a mere dreamscape, a creation of Dorothy’s subconscious. Furthermore, in the book, Dorothy’s magic slippers are silver, but the film team changed the color to a sparkling ruby to take advantage of the still-new Technicolor process.

At First, the Screenwriters Wanted To Eliminate All References to Magic

By the late 1930s, Hollywood had tried producing a handful of fantasy films. Most of them flopped, and some screenwriters worried the same would happen to Wizard of Oz. So, in early scripts, much of the movie’s magical elements were scrapped. The Tin Man, for instance, was transformed into a convict sentenced to wear a tin suit for punishment. Meanwhile, the Scarecrow was a dull human farmhand who was employed to spook birds out of a pasture. Thankfully, the magic returned.

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The Makeup Was Toxic

Originally, the role of the Tin Man was to be played by Buddy Ebsen (who later became best known for his role as Jed Clampett on The Beverly Hillbillies). But the actor quickly realized he was allergic to the aluminum dust in his makeup: After just 10 days, he began complaining of aches and shortness of breath and had to be hospitalized. Ebsen wasn’t the only one who had problems with his makeup. The makeup was so poisonous that some actors could not eat once it had been applied. (They opted for a liquid diet, nourishing themselves through straws.)

It Was Impossible To Beat the Heat

The Wizard of Oz was not the first film to use Technicolor. It was, however, shot almost entirely inside a studio, which made the Technicolor process exhausting to work with. To get the colors just right, the set had to be brightly lit — in fact, overlit — which baked the studio to temperatures as high as 100°F. The heat, combined with the heavy costumes and thick makeup, was torturous. (Actor Bert Lahr, who played the Cowardly Lion, sweat so much under his nearly 100-pound costume that the whole getup had to be placed in an industrial drying bin each night to pull out all the perspiration.) The hot temperature also made it especially frustrating to work with animals like Cairn terrier Toto, who often refused to comply with directions.

The Origin of the Word “Munchkin” Might Have Something To Do With Beer

Nobody is entirely sure where the word “Munchkin” came from, but it’s possibly German in origin. (Baum’s father was of German descent.) It may be a reference to Mȕnchner kindl, a popular symbol of a small robed child that’s seen on Munich’s coat of arms and is commonly found on Bavarian beer steins (it translates as “Munich child”). It also may come from the German word Männchen, which is used to describe a diminutive man.

A movie still of the North Munchkins in 'Wizard of Oz'.
Credit: Masheter Movie Archive/ Alamy Stock Pho

The Congregation of Little People on Oz Was Unprecedented

Around 120 little people were cast to appear in Oz. Several met their spouses on set. And it’s said that the mass gathering inspired the formation of an influential new advocacy group, now called Little People of America.

That Salacious Rumor About the Munchkins? It Isn’t True

A pervasive rumor suggested that the actors cast as Munchkins engaged in Bacchanalian orgies at their hotel in Culver City. This isn’t true. The gossip was sparked by Judy Garland during a (fully facetious) 1967 interview with Jack Paar, but the smear would haunt many of the actors for the rest of their lives. When asked if the rumors of drunken debauchery were true, actor Jerry Maren said, “That’s a lot of hooey.”

A movie still of the main characters from 'Wizard of Oz'.
Credit: cineclassico/ Alamy Stock Photo

The Original Screening Contained a Lot More Music

The original screening of The Wizard of Oz was two hours long and contained significantly more musical numbers. But after a test run, the production team decided to cut many dance sequences, song reprises, and a performance of “The Jitterbug.” MGM even considered cutting “Over the Rainbow.” (Thankfully, they were talked out of it.)

Some of the Costumes Were Delicious

While many of the costumes were cumbersome (like the Cowardly Lion or the winged monkeys) or required excessive toxic makeup (like the Tin Man or Wicked Witch), some equine members of the cast were pretty pleased with their get-ups. In the “horse of a different color” scene, the special effects that allowed the carriage horse to change from white to purple to red to yellow were achieved by adding Jell-O powder to the horses’ coat. (The horses enjoyed licking it off.)

Also, the Tin Man’s oily tears? That’s actually chocolate syrup.

Interesting Facts
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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.

Original photo by ventdusud/ iStock

You might be fooled into thinking you know everything about these iconic U.S. landmarks, but despite their international fame, there’s more to these hotspots than meets the eye. There are hundreds of hidden features inside our nation’s most renowned sites that only the most dedicated visitors will ever find. Here are a few of the most interesting and mysterious.

Famous landmark, Mount Rushmore.
Credit: Richard A McMillin/ Shutterstock

A Hidden Chamber Sits Behind Mount Rushmore

While sculptor Gutzon Borglum never came close to realizing his original vision for Mount Rushmore — the presidential heads were meant to top presidential bodies — he did get started on another little-known component of this South Dakota memorial. Nestled in a small canyon behind Abraham Lincoln’s head is the entrance to what was intended to be an 80-by-100-footHall of Records,” which was supposed to be stocked with copies of historical documents such as the U.S. Constitution and busts of important Americans.

Borglum was hopeful the Hall of Records would explain the significance of the memorial to future civilizations, but he was ordered to stop its development after only a year, because Congress wanted him to focus on the construction of the faces. The combination of his death in 1941 and America’s entry into World War II ended any hope of the hall’s revival. In 1998, 16 porcelain enamel tablets containing documents such as the Declaration of Independence and records describing Mount Rushmore’s creation were placed in a vault deep in the unfinished chamber, apparently only for future civilizations to peruse since the chamber remains off-limits to contemporary tourists.

US Supreme court building on the capitol hill in Washington DC.
Credit: Fedor Selivanov/ Shutterstock

The U.S. Supreme Court Building Houses a Basketball Court and Gym

Located a floor above the “Highest Court in the Land” is a court of a very different sort, where justices who normally hear arguments over the gray areas of the American legal system instead argue over who fouled whom. Initially designed as a storage space, this area was converted into a gym in the 1940s, with a pair of backboards installed to accommodate what became the in-house favorite sport. Adjacent to a full weight room, the smaller-than-regulation-size basketball court mainly sees games played by clerks and off-duty security officers, but has also drawn participating justices. Activity in this part of the building apparently gets intense enough to have necessitated a sign reading: PLAYING BASKETBALL AND WEIGHT LIFTING ARE PROHIBITED WHILE THE COURT IS IN SESSION.

1894 STATUE OF WILLIAM PENN.
Credit: H. Armstrong Roberts/ClassicStock/ Archive Photos via Getty Images

Philadelphia’s William Penn Statue Has an Entry Hatch Located on Its Hat

Unlike most of the other landmarks noted here, the statue of William Penn is almost exclusively viewed from a distance, due to its location atop Philadelphia’s City Hall. As such, few people have intimate knowledge of its features, which include an entry hatch on the hat of the city’s famous founder. Those who do get inside the hollow structure can see the chalk-carved names left behind by previous workers, or take a closer look at the flange-bolting craftsmanship that pulled the statue’s 47 distinct parts together. Unfortunately, there aren’t any tours that wind their way to the inside of Billy Penn, and the hat access is mainly used by the conservationists who deal with cleaning the 37-foot, 53,000-pound bronze behemoth every decade or so.

Radio City Music Hall in the Rockefeller Center.
Credit: Frederic Lewis/ Archive Photos via Getty Images

A Pristine Penthouse Endures Inside Radio City Hall

When the lavish, art deco-styled Radio City Music Hall was built in midtown Manhattan in the 1930s, an equally lavish penthouse was carved out for the theater’s flashy impresario, Samuel “Roxy” Rothafel. Boasting cherry-paneled walls, gold-leaf ceilings, custom-made furniture, and a dome-shaped dining room, the penthouse was as much a refuge for relaxing as it was a stylish venue in which to entertain visiting luminaries such as Judy Garland and Walt Disney.

Rothafel himself only got to enjoy the luxury for a few years until his death in 1936, and the apartment lay mostly untouched in the decades that followed. In recent years, it’s been cleaned up for tours, with the original furniture and fixtures on display, while high rollers who want to celebrate like it’s the end of Prohibition can even rent out the space for special occasions.

View of the water flowing at the Niagra Falls in Canada.
Credit: Chawalit Siwaborwornwattana/ Shutterstock

Niagara Falls Can Be “Turned Off”

OK, there isn’t a giant faucet that can be twisted to halt the 3,160 tons of water that gush over Niagara Falls every second, but portions of the world-famous falls can be dried up by the construction of cofferdams to divert the flow of water. This happened in the 1950s on the western flank of Horseshoe Falls, on the Canadian side of the border, in an attempt to reshape the rock face and alter the “presentation” of the cascading water. Another cofferdam was erected in 1969 to investigate the rock debris that had piled beneath the American Falls section in New York, before authorities ultimately decided to leave the rock pile in place. There reportedly are plans to turn off the falls again on the American side to replace a pair of century-old bridges that aren’t used anymore, although this project has remained in limbo for several years.

A sunken World War II-Era Higgins landing craft in Lake Mead.
Credit: Ethan Miller/ Getty Images News via Getty Images

Once-Submerged Attractions Can be Seen Above Lake Mead

Formed by the construction of the Hoover Dam in the 1930s, Lake Mead contains a wealth of underwater sights for the scuba divers who flock to this recreation area on the Nevada-Arizona border. And thanks to the megadrought that’s plagued the Southwest since the start of the 21st century, many of these once-submerged attractions are now partially or completely visible to landlubbers. The list includes a World War II-era “Higgins boat,” as well as the remains of the Mormon-founded settlement of St. Thomas. While these spectacles garner attention from those who don’t know the difference between a wetsuit and a drysuit, divers can take heart in the news that water levels seem to be on the rise again after reaching historic lows in October 2022.

An aerial view of New York City's Empire State Building.
Credit: ventdusud/ iStock

The Empire State Building Has a Secret 103rd Floor

Although the Empire State Building is advertised as having 102 floors, that’s not quite the case. There’s actually another floor that was originally constructed for building maintenance. It now acts as an ultra-exclusive hotspot for the rich and famous.

Unlike floor 102, which features a wrap-around balcony and glass windows, floor 103 is ultra-thin with only a knee-high railing separating observers from the sky surrounding them. Inside the building, there’s a small room used for housing electrical equipment, but most celebrities just stay on the balcony and enjoy the adrenaline-inducing photo op.

A view of the St. Louis Arch seen from the water.
Credit: f11photo/ iStock

There’s a Time Capsule at the Top of the St. Louis Arch

Most visitors to the Gateway Arch in St. Louis don’t realize that the monument also provides a look back in time. In October 1965, a time capsule was added to the top of the Arch. The contents aren’t exactly major historical relics, but they’re surprisingly sweet — the capsule contains the signatures of more than 700,000 citizens of St. Louis, many of them schoolchildren. The capsule is permanently welded to the Arch, so it will remain intact as long as the Arch stands.

New York City's Grand Central Terminal bustling with people.
Credit: focusstock/ iStock

Grand Central Terminal Has a Tennis Club

Roughly one million people pass through Grand Central Terminal every day, but almost nobody knows about the tennis club that exists above their heads. Founded in the 1960s by a wealthy Hungarian immigrant, the tennis club consisted of two simple clay courts and existed for the public to enjoy while waiting for their ride.

In 1984, however, Donald Trump purchased the space and redeveloped it into a luxurious locale for celebrities — charging upwards of $130 per hour to rent it out. The courts stayed under his control until 2009 when they were renovated and reopened to the public. Although it’s open (it’s now called Vanderbilt Tennis), you’ll still need some luck in order to find it since many employees don’t even know it exists.

Washington, D.C.'s Lincoln Memorial.
Credit: OGphoto/ iStock

A Cave Lies Beneath the Lincoln Memorial

Most people who visit the Lincoln Memorial spend all of their investigative energy trying to find the famous typo carved into the walls. However, underneath the memorial, there’s an even better-hidden gem — a full cave complete with stalactites. Construction workers stumbled upon the cave in the 1970s when digging out an elevator shaft for disabled visitors.

Apart from the gorgeous nine-foot stalactite rock formations, the most fascinating part of the cave is the graffiti that adorns the 122 supporting columns. Visitors who embark on a cave tour can view these original World War I-era scribbles made by an unidentified construction worker. They include caricatures of everyone from Woodrow Wilson to the monument’s construction foreman.

A shot of the infamous Brooklyn Bridge, from the Hudson River.
Credit: mshch/ iStock

There Are Wine Cellars in the Base of the Brooklyn Bridge

Engineer Washington Roebling had some serious business smarts when he created the Brooklyn Bridge. When he first started construction, he faced two major problems: There wasn’t enough money in the city to pay for the full project and two local wineries refused to move their facilities out of the path of construction.

In a stroke of genius, Roebling solved both problems by incorporating two full wine cellars into the base of the bridge on each side. To help finance the bridge, he rented the cold, dark cellars out to local businesses who needed some extra storage and generated profit for the city until the Prohibition Era. Today, the city of New York has taken ownership of the cellars, stripping the caverns of their functionality and leaving them as a dry, empty reminder.

California's Disneyland with a Mickey Mouse ferris wheel to the right.
Credit: FrozenShutter/ iStock

Disneyland Has a Secret Members-Only Club

Club 33 is an inconspicuous little room at Disneyland in Anaheim, California, but the people who enter are anything but low-profile. This exclusive clubhouse boasts an invite-only guest list where members must pay anywhere from $25,000 to $100,000 to get initiated and $12,500 to $30,000 in annual membership dues after that. Even if you do have hundreds of thousands of dollars to fork over for this exclusive experience, the waitlist is six years long and spots rarely open up for new members.

On top of that, the activities of the members are held in top-secret status within the park’s administration, which means you never quite know what you’re getting into when you sign up. There’s only one thing we do know for sure about Club 33 — it’s the only place in the park to serve alcohol, which means it just might be worth the investment.

Tim Ott
Writer

Tim Ott has written for sites including Biography.com, History.com, and MLB.com, and is known to delude himself into thinking he can craft a marketable screenplay.

Original photo by Kira auf der Heide/ Unsplash

Exchanging gifts is one of the oldest forms of human social interaction, one even found in our close primate relatives, the chimpanzees, who give food and stones to one another. But gifting customs and expectations — like what kind of gift to give, when it is appropriate to offer a gift, and whether to anticipate anything in return — are different depending on what culture you belong to. Here are a dozen types of gifts and gifting traditions from around the world.

Woman giving mandarin oranges and red envelop with Good Luck character.
Credit: ThamKC/ Shutterstock

China — Oranges

Offering someone a pair of mandarin oranges is a New Year’s custom in China. It’s unclear how this tradition started, but it could relate to the similarity of the words for “oranges” and “wealth” in the Cantonese dialect, meaning you are symbolically giving someone wealth to start their year. The color of the oranges is also said to symbolize gold.

Egypt — Double-Wrapping Your Gift

In Egypt, giving gifts to business colleagues is common, with the idea that it ensures a good working relationship in the future. Whether you are gifting a box of sweets or a personalized pen, it’s important that the gift be wrapped well — typically in plain-colored paper first, and then in a bright color like green. (Be careful what colors you use wrapping gifts in some other cultures, though, since different hues can mean different things.)

Close-up of a tulip bouquet.
Credit: Sergey Bezgodov/ Shutterstock

Russia — Flowers

A common gift in many cultures, flowers are particularly beloved in Russia. But the gift-giver needs to pay close attention to certain aspects of the bouquet, such as the color and number of flowers. Yellow flowers may suggest unfaithfulness or mourning, while calla lilies symbolize death. And rethink that dozen roses: Russians think that an odd number of flowers is most appropriate for happy occasions and reserve even numbers for funerals.

Kenya — Spitting

While spitting on a gift may seem rude to many people, in some cultures, this is a blessing. Among the Maasai of Kenya, spitting is a sign of reverence and is often done to bless a wedding or the birth of a baby, in addition to being used for gifts. But “ceremonial spitting” is known from various times and places — the Bible even says that Jesus touched a man’s tongue with his own saliva to fix his stutter — so extending the idea to “blessing” a gift makes sense.

Red lottery ticket lies on pink gambling sheets.
Credit: Mehaniq/ Shutterstock

U.S., U.K., and Canada — Lottery Tickets

Becoming more popular by the year, scratch-off lottery tickets are often given as small gifts in these countries. Tucked into a birthday card or as a “white elephant” contribution, a lottery ticket is inexpensive, with the possibility of being worth quite a bit. But some frown on this idea, saying it could be detrimental to people with addiction issues and even to family harmony, if a gifted ticket wins big.

Ireland — Refusing the Gift

In Ireland, the recipient of a gift may politely decline it at least once, just as they may say no to their host’s offer of a cup of tea or glass of water. But the second or third time the gift is offered, the recipient accepts it. While this tradition may date back to the Great Famine in the mid-19th century — ensuring that one’s host is not putting themselves out by offering you what little they have — the fact that gift refusal is also found in parts of Asia and elsewhere suggests that saying, “Oh, no, I couldn’t, really,” is perhaps more of a worldwide tradition.

Vintage old books on an antique chair.
Credit: Daria Medvedeva/ Shutterstock

Iceland — Books

If reading by the fire while sipping hot chocolate sounds like your ideal evening, Jólabókaflóðið might be your new favorite holiday. The word translates roughly to “Christmas book flood,” as Icelanders exchange books as gifts on Christmas Eve. The tradition began during World War II, although Iceland has a tradition of valuing books and authors that’s far older. Since paper was not rationed during WWII, Icelanders turned to books for gift-giving. Now, Icelandic booksellers put out a “book bulletin” every year that goes to each household in mid-November. On Christmas Eve, everyone begins reading the books they’ve been given right away.

New Zealand — “Utu” and “Koha”

Among the Māori, who are the Indigenous people of Aotearoa (New Zealand), there is a concept called utu, which is the balance or harmony necessary for a functioning society. The exchange of gifts is driven by utu, or the idea that the gift-giver will receive something equivalent. This custom can be seen in action most often when guests bring a small gift or donation (koha) to the host of a party.

Flag of Saudi Arabia in front of blue sky.
Credit: Royal Graphics/ Shutterstock

Saudi Arabia — Gold and Silk

We may closely associate these two items with the Middle East, but while gold and silk are appropriate gifts for women in Saudi Arabia, the prophet Muhammad said they are forbidden for Islamic men. But Saudis appreciate all kinds of other gifts, typically bringing back souvenirs for family and friends, even from short trips.

In many of the Indigenous cultures of North America, giving with the assumption the receiver will reciprocate is the norm, and the richest people are those willing to give away everything they own. One example of unique gift-giving can be seen among the Navajo (called Diné in their own language): the laugh celebration. The first time a Navajo baby laughs, they are given a piece of turquoise — and whoever elicits that first real baby giggle is tasked with hosting a feast for the baby and their family.

Close-up of a sperm whale tooth.
Credit: Steven Giles/ Shutterstock

The tooth of a sperm whale is called tabua in traditional Fijian culture. The word translates roughly to “sacred,” and the tabua is powerful and significant, often gifted at weddings or used as a peace offering. Although the tabua was never considered currency itself, necklaces made from these whale teeth appear today on the 50 Fijian dollar note.

Ancient Rome — Wax Fruit and Clay Lamps

One of the most anticipated holidays for the ancient Romans was Saturnalia, celebrated annually the week of December 17 to 23. Connected with the winter sowing season, Saturnalia was a time to let loose — even enslaved people were temporarily free to say and do what they wanted. People also gave each other small gifts called sigilla in a “white elephant” kind of game. Sigilla included small wax figurines of various deities or replicas of fruit, as well as ceramic oil lamps, which would have been useful in the darker days of the year. With the rise of Christianity in the waning days of the Roman Empire, many of the traditions of Saturnalia were eventually incorporated into Christmas and New Year’s celebrations.

Kristina Killgrove
Writer

Kristina Killgrove is a science communicator with a Ph.D. in anthropology. She has written for numerous media sites, including Live Science, Mental Floss, and Forbes.