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It’s hard to define pizza. Is it flatbread with toppings, or something more specific? While flatbread has existed in many cultures for centuries, pizza as we know it today is more commonly associated with Italy, particularly Naples. What was once a niche regional dish has become one of the most popular foods in the world; one survey suggested that “pizza,” meaning “pie,” is the best-known Italian word outside Italy, beating out even “spaghetti.”

Despite the dish’s European roots, America has welcomed pizza as its own, spurring specific regional styles from New York to California — and one lesser-known variant that even has built-in dessert. When exactly did pizza take off in the states? What is pizza like back in Italy? What’s the deal with pizza rolls? These six facts about pizza may have you heading out to grab your favorite slice.

Portrait of Margherita Maria Teresa Giovanna of Savoy, Queen of Italy.
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The First Recorded Pizza Delivery Was in 1889

In 1880s Naples, pizza was a staple food for the working class, although nobility turned up their noses at it. It didn’t really catch on in the rest of the country until the newly crowned Queen Margherita paid a visit to the seaside town in 1889. One night, the legend goes, she grew tired of fancy meals and asked for some local cuisine.

Pizza chef Raffaele Esposito made the queen three pizzas, including what we know now as the Margherita pizza — tomato, basil, and mozzarella for the three colors of the Italian flag — and hand-delivered them. Legend has it the queen took one bite of that pizza and said it was one of the best things she had ever eaten, which is how it got its name.

It’s entirely possible that more informal pizza delivery happened about town before this, but it’s certainly the first one that went down in history. There is some controversy about whether this story is actually true, but regardless, the pizzeria where Esposito worked, Pizzeria Brandi, still displays a royal thank-you note on its walls.

Group of people eating pizza in a parlor.
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Pizza Took Off in America After World War II

While pizzerias had existed for decades beforehand, especially in working-class Italian communities, pizza didn’t penetrate everyday life in America until after World War II. Soldiers came home after sampling the dish abroad, and pizza quickly became a booming business. Pizzerias started popping up in every state in the country, especially after the Bakers Pride commercial pizza oven launched around 1945. National chains began to emerge in the late 1950s: Pizza Hut in 1958, Little Caesar’s in 1959, and Domino’s in 1960, to name a few. Today, demand for chain pizza is dropping a little, but the pizza market is still strong.

International franchise Pizza Hut logo.
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Pizza Was One of the First Things Sold on the Internet

Ordering pizza online may seem pretty newfangled, but the first pizza was sold on the internet nearly 30 years ago. Way back in the mid-’90s, online shopping was in its infancy. The first online vendor, as we know them today, was NetMarket, which launched in the summer of 1994. (Its first sale was a Sting CD.) Less than a month later, Pizza Hut launched PizzaNet, its first online ordering service. Back then, with only dial-up internet and no cloud computing services, setting up online ordering was a more onerous task, requiring the company to install a server at its Wichita, Kansas, headquarters. The pilot program was limited to Santa Cruz, California, so after customers were done, their orders traveled over the internet to Wichita, then back out to a local Santa Cruz Pizza Hut. Somewhat defeating the purpose, that local Pizza Hut would then call to confirm the order over the phone. The first order, according to Pizza Hut, was a mushroom, pepperoni, and extra-cheese pizza.

It was a big year for online shopping — Amazon launched in 1994, too, and eBay followed soon after in 1995. PizzaNet, sadly, wasn’t as successful, but Pizza Hut eventually relaunched online ordering in 2001.

Close-up of full Colorado-style pizza.
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Colorado-Style Pizza Has Built-In Dessert

Many regions of the United States have their own styles of pizza, like the big thin slices of New York and the bready Philly tomato pie. Colorado-style pizza, also known as mountain pie, is a little less famous, but it’s definitely unique. The thickest part is the braided crust, which surrounds a tall stack of toppings. The meats are precooked so they don’t make a mess. It’s deep, but a far cry from a big melty Chicago deep-dish.

The built-in dessert is that distinct braided crust, which comes with dipping honey to top off an all-in-one meal.

Neapolitan pizza with spices.
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Italian Pizza Is Strictly Regulated

You know how Champagne only comes from the Champagne region of France, and anything else is just sparkling white wine? Italy has a bunch of similar rules. Many of these rules govern wine, but pizza is a protected consumable, too. Specifically, Neapolitan pizza, or pizza napoletana.

In order to be sold as pizza napoletana, the pie has to be 35 centimeters (around 14 inches) or less in diameter, have a raised rim of 1 to 2 centimeters, and follow a host of other requirements, including flour type, kneading technique, and equipment. No rolling pins are allowed. A specific type of oregano must be used. Only certain certified varieties of Italian tomatoes are acceptable. And there are only two types of Neapolitan pizza: Margherita (topped with tomato, basil, mozzarella, and additional cheese) and marinara (tomato, oil, oregano, and garlic).

One guide published by the Associazione Verace Pizza Napoletana, the organization devoted to protecting and verifying the traditional pie, is 21 pages long — and they periodically check on restaurants that claim to serve the stuff. The dish has been standardized in Italy since the late 1990s, and got special recognition from the European Union in 2009.

Totino's Pizza Rolls in the freezer section of a grocery store.
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Totino’s Uses 25 Different Recipes for Pizza Rolls

Supply chain issues during the COVID-19 pandemic hit the food industry hard, major distributors included. At the same time, customers were preparing to spend long periods at home by stocking up on their grocery-store favorites, including the popular frozen-aisle snack Totino’s Pizza Rolls. To keep up with demand and keep shelves stocked, scientists at parent company General Mills made up 25 different recipes for pizza rolls, with small substitutions like cornstarch for tapioca starch, so they could just use whichever one was most convenient at any given time.

They’re not the only company to adjust to supply chain issues with recipe changes, but 25 variations is certainly a strong commitment to keeping this favorite slumber-party snack in stock. It’s a good thing they’re not beholden to an incredibly strict list of national standards — but to be fair, if America were to enshrine one pizza product, it would probably be pizza rolls.

Sarah Anne Lloyd
Writer

Sarah Anne Lloyd is a freelance writer whose work covers a bit of everything, including politics, design, the environment, and yoga. Her work has appeared in Curbed, the Seattle Times, the Stranger, the Verge, and others.

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A potpourri of memorable dance scenes and endearing jokes, Singin’ in the Rain is the type of film beloved by both cinema buffs and casual fans who become ensnared while channel-surfing on a Saturday night. Although perhaps underappreciated (more on that below) when it was released in the spring of 1952, the film has endured as one of the all-time greats thanks to the inspired work of star/choreographer/co-director Gene Kelly, and the efforts of supporting stars Donald O’Connor, Debbie Reynolds, and Jean Hagen. Read on to learn more about what went into the production of this classic Hollywood gem.

American dancer and actor Gene Kelly and Debbie Reynolds in 'Singin' in the Rain'.
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The Soundtrack Mostly Consisted of Well-Known Songs

Co-written by Adolph Green and Betty Comden, Singin’ in the Rain was essentially a vehicle for recycling a catalog of old songs created by the film’s producer, Arthur Freed, and his longtime composing partner, Nacio Brown. Although it’s now closely associated with Kelly’s iconic dance number, the film’s title track was written in the late 1920s and appeared in at least seven MGM films overall. Other tracks, like “All I Do Is Dream of You” and “You Were Meant for Me,” were also featured in previous pictures and recorded by multiple artists. According to Singin’ in the Rain: The Making of an American Masterpiece, the only new pieces written for the film were “Moses Supposes” — with the lyrics partly lifted from 19th-century English nonsense verse — and “Make ‘Em Laugh” — which bore a strong resemblance to the Kelly-performed “Be a Clown” from 1948’s The Pirate.

Debbie Reynolds posing for a publicity portrait for the classic musical Singin' in the Rain.
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Debbie Reynolds Endured Harsh Training From Gene Kelly

A 19-year-old with limited screen and dance experience when she was cast for the role of Kathy Selden, Debbie Reynolds learned the hard way what it was like to work with a top-notch pro like Kelly. The film’s nimble-footed lead was relentless when it came to training his romantic co-star, who at one point was found sobbing beneath a rehearsal studio piano by Fred Astaire. The day-long shooting for the “Good Morning” dance scene reportedly left her with bloody feet, a grueling experience rendered unnecessary when Kelly wound up using the first take. Although she later gave Kelly credit for whipping her into shape, Reynolds also compared the making of the movie to childbirth, saying they were the “two hardest things” she’d ever done.

Gene Kelly swings from a lamp post in a still from the film, 'Singin' In The Rain'.
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Gene Kelly Battled a Fever While Shooting the “Singin’ in the Rain” Sequence

Although he seems happy as a clam during his title-track song-and-dance scene, Kelly was feeling less than glorious while gritting through his moves in a wool suit with a 103-degree fever. Of course, he didn’t have the luxury of taking much time off to recover, so, according to his wife, he relaxed in the sunlight between takes to “just kind of bake this fever out of him.” Another problem affecting the scene was the amount of water needed to simulate a rainstorm. Although a network of pipes normally ensured that Kelly was sufficiently drenched, filming had to pause when local residents watered their lawns in the late afternoon and caused the set’s flow to dim to a trickle.

Debbie Reynolds holds Gene Kelly in a scene from the film 'Singin' In The Rain'.
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Reynolds’ Voice Was Dubbed for Two Songs and One Speaking Scene

Naturally, in a movie that spotlights Hollywood’s use of uncredited singers supplying voice work for its headlining talents, there’s an uncredited singer supplying voice work for a headlining talent. As described in The Making of an American Masterpiece, Reynolds’ solo performance for “Would You?” and her duet with Kelly on “You Are My Lucky Star” were both dubbed by actress Betty Noyes. Furthermore, in the scene where Reynolds’ Kathy Selden is recording the spoken lines to be used by Hagen’s screechy Lina Lamont, that’s actually Hagen’s real voice being used.

“Make ‘Em Laugh” Was Strung Together From Donald O’Connor’s Bag of Tricks

A standout number in a film bursting with standout numbers, “Make ‘Em Laugh” differed from the other Kelly-choreographed sequences in that it was pieced together with bits from O’Connor’s days as a vaudeville star. Per An American Masterpiece, this included stunts such as the backflip off the wall — performed in two of his previous movies — and the running-in-circles-on-the-floor gag, borrowed from Jerry “Curly” Howard of the Three Stooges. Several sources, including O’Connor, have claimed that he was bedridden with exhaustion after shooting the scene, and then had to shoot it again because the original footage was ruined, although O’Connor contradicted himself when he told Roger Ebert in 2003 that those travails were fabricated.

A poster for Stanley Donen and Gene Kelly's 1952 musical 'Singin' in the Rain'.
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The Film Was Initially Overshadowed by Another Kelly Feature

Although it was generally well reviewed and turned a profit at the box office, Singin’ in the Rain was hardly considered an instant classic. That’s partly because it was overshadowed by Kelly’s previous musical, An American in Paris (1951), which claimed a whopping eight Oscars at the March 1952 Academy Awards. (Singin’ in the Rain won zero Oscars the following year.)

Within a few decades, however, Singin’ had surpassed An American in Paris as the defining musical of its time. Among the accolades that burnished its legacy, Singin’ was among the 25 motion pictures selected for the brand-new National Film Registry in 1989, and it ranked No. 5 on the American Film Institute’s 100 Years … 100 Movies (10th Anniversary Edition) list in 2008.

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.

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Though Charles III has been king of England for only a short time, his achievements extend back decades. From his work as an artist and architect to his unusual interactions with former U.S. Presidents, Charles has lived a long and storied life. Learn more about the life and times of England’s reigning monarch with these nine majestic facts.

Prince of Wales sits in the House of Lords chamber.
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Charles III Is the Oldest Person to Ascend to the British Throne

Given that his mother and predecessor, Queen Elizabeth II, was the longest-reigning monarch in British history — ruling for over 70 years — it makes sense that Charles III holds the distinction of being both the longest-serving British heir-apparent and the oldest individual to assume the British throne. Having ascended to the role at 73 years, 9 months, and 23 days old, Charles was almost a decade older than the previous record-holder, King William IV, who was 64 years, 10 months, and 3 days old upon becoming the king of England in 1830. On the flip side, Henry VI holds the record of being the youngest individual to assume the British throne — he became king in 1422 at just 8 months and 25 days old.

Prince Charles in his room at Trinity College when he was an undergraduate.
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Charles III Is the First British Monarch to Hold a University Degree

While Charles was born into a life of luxury with every resource at his fingertips, he decided to forgo the traditional at-home tutoring for royals and seek out higher education. In 1970, Charles received a bachelor’s degree from Trinity College at Cambridge University, becoming the first heir to the British crown to earn a degree of higher education. At school, Charles studied anthropology, archaeology, and history, an impressive range of topics to balance alongside his royal duties as Prince of Wales — a role he officially took on at an investiture ceremony in 1969 at age 20.

After graduating, Charles enlisted in the Royal Navy and Royal Air Force, a decision he made to follow in the footsteps of his father. While serving in the armed forces from 1971 until 1976, Charles also earned a Master of Arts degree from Cambridge in 1975.

Prince Charles Painting With Watercolors.
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Charles III Is an Accomplished and Bestselling Watercolorist

Charles has painted as a lifelong hobby. He was inspired by an art teacher, Robert Waddell, while at the Gordonstoun School (an independent boarding school in Scotland), and was later taught by British artists Edward Seago and John Napper, among others. His works — done primarily with watercolor — have made him one of England’s bestselling living artists, raking in over £2 million in earnings between 1997 and 2016.

And even though he’s now king, Charles isn’t done offering his works for public purchase. His most recent sale was a print he created of Balmoral Castle, which was auctioned off in October 2022 for nearly $6,500 U.S. dollars and is considered possibly the first piece of artwork by a living monarch offered at auction.

The Scottish family home of Castle Mey was a favorite subject of Charles’ in his early years as a landscape painter, though he has since branched out to paint locations from all around the globe. In 1986, Charles painted the Imperial Palace in Kyoto, and during a 1989 diplomatic visit with his then-wife, Princess Diana, he painted Double Haven Bay in Hong Kong. One of his watercolors was even turned into a ski pass: His depiction of Klosters — Charles’ favorite ski resort, located in Switzerland — was used as the design for that resort’s pass during the 1997 season.

Prince Charles sits with Tricia Nixon, daughter of American President Richard Nixon.
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Richard Nixon Attempted to Set Charles Up With His Daughter

In a 2021 interview, Charles revealed an unusual encounter he had with former U.S. President Richard Nixon. When Charles was on a diplomatic visit to the U.S. in 1970 as a 21-year-old, Nixon attempted to set the young prince up with his daughter, Tricia. While the romance ultimately went nowhere, Charles and Nixon’s daughter were seen galavanting about D.C., where Charles escorted Tricia to a White House dinner. The pair even attended a baseball game between the Washington Senators and Milwaukee Brewers at RFK Stadium. Tricia went on to marry a law student by the name of Edward F. Cox, whereas Charles famously married Lady Diana Spencer in 1981.

King Charles III at Aberdeen Airport as he travels to London.
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He’s the First English Monarch to Be Named Charles Since the 17th Century

Upon taking the regnal title of Charles III, England’s king became the first “Charles” to hold the position since 1685. Both of his predecessors reigned in the 17th century, beginning with Charles I, king of England from 1625 until his execution in 1649 during England’s Civil Wars. Much like Charles III, Charles I was a strong proponent of the arts, spending significant amounts on paintings by Raphael and Titian, and even instituting the official post of Master of the King’s Music (which survives to this day). Charles II reigned from 1660 until 1685, having spent the previous nine years in exile in France. While there’s no telling what the future holds, the current heir to the throne — Charles III’s son Prince William — could become the first “William” to hold the title of king of England since William IV died in 1837, should he choose to keep that name.

Prince Charles Talks With Leon Krier And Andrew Hamilton As They Look At Plans In Poundbury.
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Charles III Is an Architecture Buff and Urban Planner

Charles III has long been passionate about English architecture, going so far as to write a 1989 book titled “A Vision of Britain,” in which he opined that Britain’s past architectural decisions should form the nation’s future. That same year, Charles helped develop and launch an experimental and sustainable community in the city of Dorchester called Poundbury, which is set to be completed in 2025 after decades of work. Despite its work-in-progress status, Poundbury is currently home to more than 4,600 residents, and was built in a New Urbanist style that promotes walkability. Charles has long believed in sustainable architecture and urban planning that lowers society’s carbon footprint; one of his main design goals is to “not depend so completely upon the car.”

Prince Charles, Prince of Wales drives his Aston Martin DB6.
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Charles’ Aston Martin Runs on Wine and Cheese Byproducts

Speaking of cars, Charles’ Aston Martin DB6 — which he has owned since 1970 — uses an untraditional fuel source, in keeping with his efforts to lower his own personal carbon footprint. Instead of gasoline, Charles’ favorite vehicle uses repurposed surplus English white wine and whey made from the cheesemaking process, which is converted into bioethanol fuel. The unique fuel is created by a company called Green Fuels in Gloucestershire, who worked with Aston Martin specialists to produce the unusual energy source.

Portrait of Vlad III.
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It may or may not be a connection that Charles is proud of, but England’s king is indeed related to the brutal Romanian ruler known as Vlad the Impaler, who formed part of the Irish writer Bram Stoker’s inspiration for the character of Dracula. Genealogical evidence shows that Vlad is Charles’ great-grandfather 16 times removed through Queen Mary of Teck, his great-grandmother. Fortunately, there doesn’t seem to be any other overlap between the two men — although Charles does own a house in Transylvania.

Prince Charles, Prince of Wales poses with an Ecuadorian stream tree frog.
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Charles III Has a Frog Named After Him

King Charles III has long been involved with climate change activism and efforts to preserve the rainforest. In 2012, scientists honored his activism by naming a tree frog from the cloud forests of Ecuador Hyloscirtus princecharlesi. The frog — less formally known as the Prince Charles stream tree frog — is endangered, threatened by both climate change and habitat loss. For his rainforest advocacy efforts, Charles has sometimes been called the “Frog Prince.”

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.

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Red shorts, oversized yellow shoes, white gloves, and big ears: We all know this cartoon mouse. The most recognized rodent in the world, Mickey Mouse is the mascot of Disney and appears on everything from coffee cups and T-shirts to purses and watches. Though he started out on the silver screen, Mickey’s also active in cyberspace — his Instagram account has more than 3 million followers. Here are eight great facts you might not know about the world’s favorite mouse.

Sketch by Ub Iwerks of Mickey Mouse playing the drums.
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Walt Disney Didn’t Draw the Original Mickey Mouse

Walt Disney is the person most closely associated with Mickey, but it was Disney’s creative partner, Ub Iwerks, who first sketched out the cute cartoon mouse. Disney and Iwerks met while working in Kansas City and dreamed up Mickey when they lost the rights to their first popular character, Oswald the Lucky Rabbit. (Oswald eventually came home to Disney in 2006.) Iwerks made a number of important technological contributions to filmography, and was honored with two Academy Awards.

Steamboat Willie, 1928.
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Mickey Is Almost 100 Years Old

When Mickey burst on the scene in 1928, Herbert Hoover was President, and “talkies” (movies with sound) were just taking off. In fact, Mickey’s first two appearances were in silent cartoons (Plane Crazy and The Gallopin’ Gaucho), although these failed to find a distributor.

Mickey’s third effort — and first public appearance — was Steamboat Willie, which debuted on November 18, 1928, at the Colony Theater in New York. The short film was an immediate hit, and Mickey’s first two shorts were then released publicly, with music and sound effects added.

Mickey Mouse dressed in a top hat on stage.
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The Mouse Never Rests

Since his 1928 debut, Mickey Mouse has appeared in more than 120 theatrical releases. He’s also the mascot of the Disney theme parks (in Florida, Shanghai, Paris, California, and Hong Kong). If that weren’t enough, the anthropomorphic mouse keeps guests company on Disney cruises, and laces up his skates to perform in Disney on Ice, which has entertained more than 320 million guests in 68 countries since 1981.

Mickey and Minnie Mouse together.
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He’s a One-Mouse Man (Um, Mouse)

While they’ve never been married on-screen, Walt Disney himself said, “In private life, Mickey is married to Minnie.” The couple have been together since the beginning, although Minerva (Minnie’s real name) did date Mickey’s archnemesis, Mortimer Mouse, for a time. Minnie’s a career woman, too. In 1988, she starred in her own TV special, Totally Minnie, along with Suzanne Somers, Elton John, and Robert Carradine.

Walt Disney posing next to a stuffed Mickey Mouse.
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Walt Disney Voiced Mickey and Minnie

Not liking the voice actors he interviewed, Walt Disney voiced Mickey from 1929 to 1946. But before Walt took over, Mickey’s first words were spoken by composer Carl Stalling in The Karnival Kid. Those words? “Hot dog!”

Here’s some real romance: Later actors who voiced Mickey and Minnie Mouse, Wayne Allwine and Russi Taylor, got married in real life. Since 2009, Mickey has been voiced by Bret Iwan.

 Mickey Mouse on the red carpet during the Disney Legends awards.
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He’s No Stranger to the Red Carpet …

Mickey has rubbed elbows with celebrities at the Academy Awards over the years.  In 1988 and again in 2003, he presented the Oscar for Best Animated Short Film. His cartoons have been nominated for that same award 10 times, and one, Lend a Paw, came home with the golden statue in 1941. Meanwhile, Walt Disney received an honorary Academy Award in 1932 for creating the cartoon mouse.

Mickey Mouse's star on the Hollywood Walk of Fame.
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… Or the Hollywood Walk of Fame

If Academy Awards weren’t enough, in 1978, Mickey Mouse was the first cartoon character to get his very own star on the Hollywood Walk of Fame, in honor of his 50th anniversary. (Minnie has one, too.) And in 2005, Mickey Mouse was the first cartoon character selected to be the grand marshal of Pasadena’s Tournament of Roses Parade.

The Mickey Mouse Club Mouseketeers Annette Funicello.
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Lots of Stars Have Mickey to Thank for Their First Major Appearance

The first Mickey Mouse Club variety show aired in 1955, with 39 child actors singing, dancing, and acting in skits. The show ran for three seasons, and a number of “Mouseketeers,” such as Annette Funicello and Johnny Crawford, went on to big Hollywood careers. The All-New Mickey Mouse Club, which launched in 1989, gave us Britney Spears, Christina Aguilera, and Ryan Gosling.

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.

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Volcanoes are some of Earth’s most fascinating features. They are both creators and destroyers: Their lava cools and builds new land, while their eruptions of ash and rock have buried cities such as Pompeii and even blocked out the sun’s rays. Volcanoes have also inspired artists, writers, and scientists for centuries. Read on for some explosive examples of how volcanoes have literally changed the world.

Vilyuchinsk, known as a stratovolcano in the southern part of the Kamchatka Peninsula, Russia.
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There Are Three Main Types of Volcanoes

“Cinder cone” aptly describes how this simple volcano forms: As lava bursts out of the earth, it cools and falls back to the surface as pebbly textured cinder, piling up around the original site of the eruption. The cinder eventually forms a dark, smooth-sided cone.

Stratovolcanoes, or composite volcanoes, are made of multiple layers of volcanic rock and ash, often several thousand feet high. These mountainous volcanoes often result in huge eruptions of thick lava and tephra (small rocky fragments) that build up over time. About 60% of the world’s volcanoes are stratovolcanoes, and they include Mount St. Helens, Mount Etna, Eyjafjallajökull, Cotopaxi, Mount Pinatubo, and many more.

Shield volcanoes lack dramatic height but can still be potent. Lava erupts or oozes from multiple spots and spreads out over land; constant eruptions and lava flows eventually form low, wide domes. The Hawaiian Islands are a chain of shield volcanoes that includes Kīlauea, one of the world’s most active eruptors.

Tungurahua volcano exploding in the night.
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Eruptions Are Measured by the Volcanic Explosivity Index

The power of a volcanic eruption is measured on a scale from 0 to 8, called the Volcanic Explosivity Index, according to the amount of lava, tephra, and ash that spews forth. An eruption with a VEI of 0 is basically dormant; each subsequent number indicates a tenfold increase in ejected material. The 1980 eruption of Mount St. Helens was a VEI 5, Krakatau in 1883 was a VEI 6, and Tambora’s explosion in 1815 was a VEI 7. The most recent “megacolossal” eruption took place in 2022 at Hunga Tonga Ha’apai: The blast destroyed 90% of the South Pacific island and merited a VEI of 6.

A view of the ring of fire on a map.
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The “Ring of Fire” Is Earth’s Most Active Volcano Zone

Volcanoes exist on all seven continents. But about 75% of the world’s 1,500 active volcanoes are located in the “Ring of Fire,” a chain of volcanic mountains and islands around the edges of the Pacific Ocean. The volcanoes are clustered near subduction zones — unstable areas where one of Earth’s heavy tectonic plates slides under a lighter one. The movements trigger earthquakes, as well as a buildup of magma (molten rock) where the plates scrape together. Magma often escapes through the lighter plate as a volcano.

The breathtaking views of the Mount St. Helens volcano at sunset.
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The U.S. Has a Surprisingly High Number of Volcanoes

Three volcanoes in the Lower 48 have erupted since the Declaration of Independence was signed: Mount St. Helens in Washington, Mount Hood in Oregon, and Lassen Peak in California. But due to the statehoods of Alaska and Hawaii in 1959, the U.S. now ranks first in the world in the number of potentially active volcanoes per nation, with 162. They include the planet’s largest active volcano, Hawaii’s Mauna Loa, which rises 2.5 miles above sea level and 10.5 miles above its base on the bottom of the ocean. Alaska’s Novarupta volcano, in present-day Katmai National Park and Preserve, had the biggest eruption of the 20th century, beginning on June 6, 1912 (it earned a VEI of 6).

A giant volcanic mushroom cloud explodes some 20 kilometers high from Mount Pinatubo.
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Volcanoes Can Change Earth’s Climate

The biggest eruptions can shoot tons of ash and gas high into the atmosphere, where they can block some of the sun’s radiation and be dispersed around the world by air currents. These aerosols can actually change Earth’s climate for a few years. The 1815 eruption of Mount Tambora in Indonesia caused “the year without a summer” in Europe and New England in 1816; colder-than-average temps and heavy rains caused crops to fail. Sulfuric acid in the atmosphere following the Novarupta blast blackened brass and caused fabrics to disintegrate in Vancouver, British Columbia, and Port Townsend, Washington. Mount Pinatubo’s eruption in 1991 sent ash into the stratosphere and cooled the globe for about two years. Some scientists predict that water vapor ejected into the atmosphere from the Hunga Tonga Ha’apai eruption in 2022 may temporarily intensify global warming.

A towering plume of pyroclastic material ascends from Krakatau during an eruption.
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A Volcano Made the Loudest Sound Ever Recorded

When Krakatau blew its top in August 1883, it released a boom that geologists believe was the loudest sound in recorded history. The 310-decibel cataclysm was heard over 2,000 miles away in Australia, where ranchers thought it was a rifle shot; people 3,000 miles away thought it was a cannon blast from a nearby ship. In addition to the eardrum-busting noise, the volcano released 6 cubic miles of material into the atmosphere, triggered tsunamis that killed 36,000 people, and coated the sea in layers of floating pumice.

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 Maurice Smeets/ Unsplash

It’s easy enough to find reports of animals facing extinction — more than 37,400 species are currently headed toward this fate, according to the International Union for Conservation of Nature (IUCN) Red List of Threatened Species. But there are some real conservation success stories, too. Whether it’s thousands of bald eagles now soaring the skies or fin whales returning to the ocean, these are cases in which governments and conservationists have worked diligently to protect some of the world’s most vulnerable critters. And while there’s still work to be done, it’s worth taking a moment to celebrate these victories for species both big and small.

Close- up of a panda eating in the forest.
Credit: Maurice Smeets/ Unsplash

Giant Panda

The story of the giant panda (Ailuropoda melanoleuca) is a major conservation triumph. Once critically threatened by poaching and habitat loss, the bamboo-munching black-and-white bears benefited from a series of laws and treaties starting in the 1980s that banned illegal hunting and the trade in panda skins. In 1992, the Chinese government also established a network of panda reserves, which today number 67. Conservation programs aimed at enriching forests and halting erosion have also benefited pandas by banning logging in the forests where they live. According to the World Wide Fund For Nature (WWF), the most recent panda census, conducted in 2014, found more than 1,860 pandas alive in the wild — a rise of 17% compared to 2004. In 2016, the Red List changed the panda’s status from “Endangered” to “Vulnerable.” While conservation work is still necessary to protect these majestic creatures, their numbers are at last moving in the right direction.

An alligator in the wetland and march at the Myakka River State Park in Florida.
Credit: SunflowerMomma/ Shutterstock

American Alligator

Alligators have existed on Earth for 200 million years, but their population was at a record low when the American alligator (Alligator mississippiensis) was listed as an endangered species in 1967. The Fish and Wildlife Service, as well as the wildlife agencies of Southern U.S. states, banned hunting of the species, and alligator populations bounced back quickly. In 1987, the Fish and Wildlife Service pronounced the American alligator fully recovered and removed it from the endangered species list — an early conservation success story. American alligators are now found across the Atlantic coast and the Gulf coast, as well as the Florida Everglades.

A bald eagle flying through the sky.
Credit: Mathew Schwartz/ Unsplash

Bald Eagle

In the middle of the 20th century, things weren’t looking good for America’s national bird. Bald eagles (Haliaeetus leucocephalus) faced habitat loss, illegal hunting, and contamination of their food with the pesticide DDT, which weakened their eggshells, endangering chicks. By 1963, the birds’ numbers had fallen to only about 400 nesting pairs in the lower 48 states. The U.S. government responded with a series of measures that prohibited harming or killing the birds, and in 1973, the Environmental Protection Agency banned DDT. That same year, bald eagles became one of the original species protected by the Endangered Species Act. By 2007, the U.S. population of bald eagles had grown to 10,000 nesting pairs, and the animals were finally removed from the endangered species list. More recently, their numbers have really soared — during the 2019 breeding season, there were an estimated 316,700 bald eagles flying the skies of the lower 48.

Close-up of a gray wolf in the wild.
Credit: Milo Weiler/ Unsplash

Gray Wolf

By the early 20th century, gray wolves (Canis lupis) had almost disappeared from the lower 48 states. Since wolves have a tendency to kill cattle, ranchers targeted the creatures, bringing them close to extinction. When the wolves were listed under the Endangered Species Act in 1975, their numbers had dwindled to about 1,000, mostly located in northern Minnesota. But in the mid-1990s, gray wolves were reintroduced to Yellowstone National Park and Idaho — and their numbers began to rebound. Today, the gray wolf population stands at more than 6,000. There’s currently talk of removing them from Endangered Species Act protection, but the move is controversial among conservationists and biologists, who argue there’s still more work needed to protect the species and its habitat.

Fin whale swimming just under the surface.
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Fin Whale

Fin whales (Balaenoptera physalus), the second-largest species of whales, were historically hunted for their blubber, meat, oil, and bone. As was the case with other large whales, their populations severely declined by the mid-20th century, thanks to overexploitation from commercial whaling. But since the 1970s, the worldwide population of fin whales has roughly doubled, thanks to international whaling bans in the North Pacific and Southern Hemisphere, as well as reductions in North Atlantic catches. Today, the IUCN Red List lists them as “Vulnerable” worldwide (an improvement over their previous “Endangered” status), although they are still listed as endangered in the U.S. under the Endangered Species Act. According to NOAA, their greatest threat in the U.S. now comes from vessel strikes.

Close-up of parakeet perching on a branch.
Credit: Amara Manikanta/ 500px via Getty Images

Echo Parakeet

The beautiful bright-green echo parakeet (Psittacula eques echo) lives only on the island nation of Mauritius, off the coast of Africa. While the birds once thrived, less than a dozen remained by the 1980s, a result of habitat destruction and a rise in invasive predators. Starting in the 1970s, conservationists launched a serious rescue effort that included treating echo parakeet nests with insecticide to ward off flies that were killing young chicks; improving nest boxes to keep out rats and monkeys; providing supplemental food; and, starting in 1993, a captive breeding and release program. After decades of effort, there are now more than 750 echo parakeets in the wild. The IUCN Red List, which had once listed the birds as Critically Endangered, now considers them “Vulnerable.” Conservation efforts to protect them continue, but their numbers are increasing, and they don’t seem likely to disappear any time soon.

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 Jennifer_Sharp/ iStock

The Hoover Dam can be called both a monument and a marvel, reaching a staggering 60 stories toward the sky and at one time reigning as the world’s largest dam. This symbol of American engineering ingenuity — initially constructed to control the Colorado River’s floodwaters — attracts more than 7 million visitors each year to the Arizona-Nevada border to catch a glimpse of the dam’s massive curved wall and its waters below. Read on for six facts about the Hoover Dam, from its original name to its dramatic World War II history.

Aerial view of the Hoover Dam construction.
Credit: Bettmann via Getty Images

Flood Damage Was a Major Reason for the Hoover Dam’s Construction

The Colorado River helped carve out the American West and Southwest, flowing for 1,450 miles and providing water to seven states: Colorado, New Mexico, Utah, Wyoming, Arizona, California, and Nevada. However, thanks to snowmelt from the Rocky Mountains, the river was also prone to flooding in the early 20th century, causing major damage to farmland in Southern California. A series of floods between 1905 and 1907 led to serious discussions about damming the river. Engineers quickly considered other big benefits of taming the river, too, including providing a steady stream of drinking and irrigation water to developing cities and farmlands, and using the river as a source of hydropower.

Aerial view of the Hoover Dam.
Credit: Bob Riha Jr/ Archive Photos via Getty Images

Building the Dam Meant First Building an Entire City

Constructing a large-scale dam meant hiring a massive workforce: By the end of the project, the employee roster swelled to 21,000 people. An average day had 3,500 workers reporting to the construction site, though that number rose during busy periods, like in June 1934, when as many as 5,218 men reported to the jobsite per day. Bringing in that many workers (and their families) meant the federal government had to have a plan — which is how the town of Boulder City, Nevada, came to exist.

In December 1928, President Calvin Coolidge authorized the creation of Boulder City on federal land specifically to house workers. Construction of the town’s buildings began in 1931. Families were housed in cottages, while single men slept in dormitories, and meals were provided in a jumbo-sized mess hall that served 6,000 meals per day. Boulder City was also equipped with a state-of-the-art hospital to handle jobsite accidents, a fire department, a train station, and a movie theater.

Workers build a massive tunnel as part of Boulder Dam.
Credit: Library of Congress/ Corbis Historical via Getty Images

Constructing the Hoover Dam Required Massive Amounts of Concrete

Building a structure as large as the Hoover Dam requires massive amounts of construction materials. The dam reaches 726 feet tall, a whopping 171 feet taller than the Washington Monument, and the dam’s base is as thick as two football fields are long. Reaching those dimensions required engineers and builders to use a substantial amount of concrete — so much that the sheer volume (4.5 million cubic yards) could be used to pave a cross-country road starting in San Francisco and ending in New York City.

Ultimately, the dam had a $49 million price tag — about $882 million today — with an additional $71 million for its power plant and generators. However, the dam’s construction costs were fully repaid (with interest) by 1987, thanks to the sale of the electrical power it generated (and continues to generate).

Water having overflowed from Lake Mead into side spillways at the Hoover Dam.
Credit: Bob Riha Jr/ Archive Photos via Getty Images

The Hoover Dam Originally Had A Different Name

The Hoover Dam gets its name from President Herbert Hoover, though it nearly had a different one thanks to the influence of the Great Depression. Before becoming the 31st President in 1929, Hoover was a successful mining engineer and businessman who was familiar with the Colorado River; as secretary of commerce, he had proposed damming the river to prevent flooding and to provide water for Southern California. Once underway, the dam — which was overseen by Hoover during his presidency — was called the Boulder Canyon Project. However, in September 1930, Secretary of the Interior Ray Lyman Wilbur announced at a ceremony marking the start of construction that the dam’s name would be changed to honor Hoover’s role in its development.

Construction continued through the Great Depression, but Hoover’s presidency did not. President Franklin D. Roosevelt entered the Oval Office, and in 1933 his pick for secretary of the interior decided to backtrack on the name due to personal animosity and public anger over Hoover’s handling of the Great Depression, once again calling it the Boulder Dam. Both names were used interchangeably until April 1947, when President Harry S. Truman approved the final name: Hoover Dam.

A black and white photograph of the Hoover Dam during World War ii.
Credit: Smith Collection/Gado/ Archive Photos via Getty Images

Hoover Dam Was Heavily Guarded During World War II

In the lead-up to World War II, the federal government became increasingly worried that the Hoover Dam would be a target of sabotage from Axis forces, knocking out its ability to provide electricity and water. In 1939, public officials discussed shielding the dam by closing its power plant to the public, while also heavily restricting (and scrutinizing) employees who entered.

In November of that year, the State Department received word from the U.S. Embassy in Mexico that German agents had plotted to bomb the dam, hoping to knock out its high-voltage power lines and slow aviation manufacturing in nearby Los Angeles. A massive effort to protect the dam was soon underway — including the addition of floodlights, installation of nets that could snag approaching boats, and increased patrols on Lake Mead (which was closed to the public). However, the government’s move to protect the dam remained classified, with public officials claiming rumors of foreign sabotage were “ridiculous” and unfounded. The incident was kept under wraps until 2001, when historians uncovered unsealed documents at the National Archives.

Drought conditions at Lake Mead near the Hoover Dam.
Credit: Bob Riha Jr/ Archive Photos via Getty Images

Lake Mead Is the Country’s Largest Reservoir

Dams rely on on reservoirs, aka human-made lakes that store water. As Hoover Dam is one of the largest dams in the world, it makes sense that its reservoir would be massive, and it is; Lake Mead is the largest reservoir in the U.S. and one of the largest in the world. The expansive lake is multipurpose; it provides drinking water for nearly 25 million people, and its 550 miles of shoreline have been used by outdoor enthusiasts since it became the country’s first national recreation area, managed by the National Park Service, in 1964.

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.

Original photo by AJ Pics/ Alamy Stock Photo

He became one of the biggest names in Hollywood by way of the tough-as-nails persona displayed in films such as Hang ’Em High (1968) and Dirty Harry (1971), and then garnered even more prestige as the director of Academy Award-winning films such as Unforgiven (1992) and Million Dollar Baby (2004). But Clint Eastwood didn’t simply roll out of bed one day and become a movie star, nor has he focused exclusively on filmmaking over the course of a rich life that began during the Great Depression. Read on to learn more about this American icon… if you feel lucky, punk.

American actor Clint Eastwood as Private Kelly.
Credit: Silver Screen Collection/ Moviepix via Getty Images

An Army Stint Ignited His Interest in Acting

Like many young adults, Eastwood bounced around a bit before finding his true calling. His early resume included time spent as a hay baler, truck driver, gas pumper, and lumberjack. However, it was his turn as an Army swim instructor that ultimately pointed the tall, athletic Californian toward Hollywood. While he took the cushy job to avoid deployment to the Korean War, the gig also brought him into contact with drafted actors such as Richard Long, Martin Milner, and David Janssen. Noting the post-Army screen successes of these friends, Eastwood ultimately elected to take acting classes at Los Angeles City College following his discharge.

Clint Eastwood, US actor, smoking a cigar, wearing a brown hat and poncho.
Credit: Silver Screen Collection/ Moviepix via Getty Images

A Low Asking Price Led to Eastwood’s First Big-Screen Starring Role

In hindsight, it seems logical that Eastwood made the winning leap from cattle driver Rowdy Yates on Rawhide to the (mostly) nameless gunslinger of A Fistful of Dollars (1964), but success was no sure thing at the time. For starters, Eastwood received the opportunity largely because he was cheaper than other prominent American actors — not always a great sign for the overall viability of a project. There was also the matter of communication issues, as Italian director Sergio Leone spoke little English. And then there was the lawsuit filed by Japanese director Akira Kurosawa, who accused Leone of copying his samurai movie Yojimbo (1961). Despite the production troubles, Fistful and its sequels For a Few Dollars More (1965) and The Good, the Bad and the Ugly (1966) became overseas hits before finally reaching American shores in 1967, paving the way for Eastwood’s big-screen career to take off.

American actor Clint Eastwood as Inspector 'Dirty' Harry Callahan.
Credit: Silver Screen Collection/ Moviepix via Getty Images

Eastwood Became Dirty Harry After Other Stars Passed on the Part

Other than his Man with No Name antihero from the Dollars Trilogy, Eastwood is perhaps best known for portraying “Dirty Harry” Callahan across five films. But that famous role also nearly went to someone else, as Robert Mitchum and Steve McQueen were reportedly among the big-name stars who rejected the offer. According to Eastwood, it was Paul Newman who first tipped off a studio executive that the erstwhile spaghetti Western star would be a good fit for the part. After Frank Sinatra pulled out of the movie, Dirty Harry finally moved ahead with the man who would become its iconic, magnum-toting lead.

Clint Eastwood proudly holds up a t-shirt proclaiming him as the mayor of Carmel, California.
Credit: Bettmann via Getty Images

He Served One Term as Mayor of a California Town

Following in the footsteps of actor-turned-politician Ronald Reagan, Eastwood in 1986 launched a bid for the mayorship of Carmel-by-the-Sea, the tiny mid-California coastal town he’d called home for several years. After winning in a landslide, Mayor Eastwood overturned some of the town’s archaic ordinances, including one that made it illegal to eat ice cream on the street. He also expanded the local library. It wasn’t all smooth sailing, of course, as residents grumbled about the influx of tourists who showed up to get a glimpse of the movie star running the show. Rather than leverage what had been a mostly successful tenure into a heftier political profile, Eastwood announced he was stepping down after one term to spend more time with his children.

Clint Eastwood records a song.
Credit: Michael Ochs Archives/ Moviepix via Getty Images

Eastwood Recorded a Chart-Topping Country Music Hit

A music enthusiast, Eastwood has delivered several simple but resonant scores for his movies, though his track record as a singer is decidedly more mixed. His album Rawhide’s Clint Eastwood Sings Cowboy Favorites (1963) failed to make an impact on the charts, and the sight of his stoic frontiersman crooning “I Talk to the Trees” in Paint Your Wagon (1969) remains somewhat jarring. To his credit, Eastwood shrugged off the critics and continued recording songs when inspired, even scoring a No. 1 country hit alongside Merle Haggard in 1980 with the catchy sing-along “Bar Room Buddies.”

Clint Eastwood with his arm around Manis the orangutan.
Credit: Michael Ochs Archives/ Moviepix via Getty Images

The Big-Screen Tough Guy Has a Soft Spot for Animals

It may not come as a surprise to anyone who watched Eastwood pal around with Clyde the Orangutan in Every Which Way but Loose (1978), but the man behind Dirty Harry and other Tinseltown tough guys is a big softie when it comes to animals. In a 2009 interview with GQ, the actor described a homestead filled with pigs, chickens, birds, and a “crazy rabbit,” and disclosed that the last time he’d cried was when a pet cockatoo died. Similarly, his daughter Alison recalled a houseful of pets while growing up, including the baby deer taken in after its mother was hit by a car. However, Alison also revealed that her father isn’t so welcoming to all animals — he’s apparently allergic to cats and some dogs.

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 ARCHIVIO GBB/ Alamy Stock Photo

You must remember this: If a kiss is just a kiss, and a sigh is just a sigh, when is a film not just a film? Certainly when it’s a phenomenon like Casablanca, a hit movie that enjoyed a profitable box-office run and claimed three Academy Awards, then went on to become something even greater — a symbol of old Hollywood operating at the peak of its powers. At the risk of breaking the timeless spell woven by the iconic Humphrey Bogart and Ingrid Bergman, here’s a rundown of six facts behind the making of this legendary feature.

Sign outside of Rick's Cafe Americain.
Credit: Hulton Archive/ Archive Photos via Getty Images

“Casablanca” Originated as a Stage Play

Horrified by the antisemitic environment he witnessed on a trip to Vienna in 1938, English teacher Murray Burnett teamed with writing partner Joan Alison to pen a play about refugees seeking safe passage from war-torn Europe, titled Everybody Comes to Rick’s. Sold to Warner Bros. in 1941 for the then-impressive sum of $20,000 after being unable to find a Broadway producer, Everybody Comes to Rick’s underwent a series of changes before emerging as Casablanca, although the main character of Rick Blaine and the general premise remained largely the same. After decades of seeking more recognition for his part in creating one of Hollywood’s most famous films, Burnett finally saw his original play produced for the first time — under the title of Rick’s Bar Casablanca — in London in 1991.

The cast of Casablanca (1942).
Credit: John Springer Collection/ Corbis Historical via Getty Images

The Cast Was Filled With Foreign-Born Actors

It’s fitting that a film about refugees was made with a predominantly immigrant cast. According to Noah Isenberg’s We’ll Always Have Casablanca, more than 30 countries were represented among the approximately 75 actors in the film; of the 14 actors to earn a screen credit, only three were born in the United States. Many had actually fled the Nazi regime, adding an extra layer of emotional heft to the movie that occasionally bubbled to the surface. Dan Seymour, who played the doorman Abdul, later noted that there were real tears flowing during the powerful scene where the resistance supporters drown out the singing Nazis by belting out “La Marseillaise.”

Dooley Wilson playing the piano in Casablanca.
Credit: Silver Screen Collection/ Moviepix via Getty Images

The Film’s Producer Wanted Sam To Be a Woman

Play it, Samantha? As described by Isenberg, producer Hal B. Wallis toyed with the idea of making the pianist at Rick’s Cafe Americain a woman, with Lena Horne and Hazel Scott among those up for consideration. The role ultimately went to Dooley Wilson, a drummer who went through the motions of piano playing while Elliot Carpenter handled the instrument nearby, off-screen. Wallis was reportedly unimpressed with Dooley’s singing and also wanted the songs redubbed, although in the end it is Dooley’s voice we hear throughout the film on compositions such as “It Had to Be You,” “Knock on Wood,” and, of course, “As Time Goes By.”

Cover of the sheet music for As Time Goes by from the movie Casablanca.
Credit: Buyenlarge/ Archive Photos via Getty Images

The Film’s Composer Disliked “As Time Goes By”

Written by Herman Hupfeld in 1931 for the Broadway musical “Everybody’s Welcome,” “As Time Goes By” featured prominently in the script for Everybody Comes to Rick’s, and was still embedded in Casablanca by the time composer Max Steiner was assigned the score. Per Isenberg, Steiner was not a fan of what he described as the “lousiest tune,” and his efforts to have it eradicated from the film were allegedly halted only because it would have entailed numerous reshoots. Steiner did, however, ultimately find a way to build his soundtrack around the wistful strains of “As Time Goes By” — a move that clearly pleased generations of audiences, considering it was named the No. 2 song in Hollywood movie history by the American Film Institute in 2010.

View of the Casablanca end screen.
Credit: TCD/Prod.DB/ Alamy Stock Photo

The Screenwriters Devised an Ending To Conform to Ethics Codes

With the script still unfinished by the time shooting began in May 1942, primary screenwriters Julius and Philip Epstein rushed to finish off a story that would conform to the strict guidelines of the Production Code Administration. One of the biggest problems was coming up with a satisfying ending, knowing full well that the PCA would never permit Rick to ride off with the married Ilsa. According to legend, the Epstein brothers were driving along a stretch of Sunset Boulevard when they simultaneously looked at one another and declared, “Round up the usual suspects!” The bolt of inspiration put the final pieces of the puzzle in place: Captain Renault covers for the murder of Major Strasser with one of his signature lines, setting the stage for Rick’s need to escape and his noble but bittersweet farewell to Ilsa.

Ingrid Bergman and Humphrey Bogart looking out window in a scene from the film 'Casablanca'.
Credit: Archive Photos/ Moviepix via Getty Images

“Casablanca” Was Extensively Edited for Its Initial Release in Germany

Casablanca was nowhere to be found in Germany following its widespread release in 1943, and by the time the film arrived in German theaters in 1952, it looked markedly different from the version Americans had grown to love. Gone were any references to the Nazis, which meant auf wiedersehen to the above-mentioned “La Marseillaise” singing scene. Some of the characters also emerged in different forms, with resistance leader Victor Laszlo now an Interpol-wanted Norwegian physicist named Victor Larsen. Altogether, the German-appeasing efforts shortened about 25 minutes from the film, which eventually surfaced in original form in the country in 1975.

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 Efetova Anna/ Shutterstock

The color purple is many things — a quirk of human biology, a spectral anomaly, and a symbol of power and prestige that stretches back into time immemorial. These six facts explore the amazingly rich, scientifically complicated history of that intriguing mix of blue and red we call purple.

Close-up of a group of violet coral shells.
Credit: cbimages/ Alamy Stock Photo

The origins of the word “purple” lie in the ancient Greek porphura, which also means “purple.” However, the word is also a reference to a particular mollusk — a sea snail, to be precise. Known as the purpura mollusk (Stramonita haemastoma), this sea snail and another known as the dye murex (Bolinus brandaris) were the primary means by which the ancient Phoenicians of the Levant developed a purple dye known as Tyrian purple (named after the city of Tyre, where it was manufactured). Starting possibly as far back as the 16th century BCE, Phoenicians (whose name derives from a Greek word for “purple”) derived the dye from dehydrated mucus glands behind the creature’s rectum. Each mollusk yielded extremely limited amounts of dye, requiring a staggering 12,000 mollusks to produce just one gram of the stuff.

Aerial view of different shades of purple paint cans.
Credit: Manuta/ iStock

The Color Purple Technically Doesn’t Exist

Our eyes perceive color in the visible spectrum due to particular wavelengths: Red is the longest wavelength, at 700 nanometers, whereas violet is the shortest, at 380 nanometers. This is why the invisible wavelengths just below this threshold are known as ultraviolet, or UV rays (and why wavelengths directly above 700 nanometers are known as “infrared”).

The color purple, however, is what physicists call a “nonspectral color,” meaning it isn’t represented by a particular wavelength of light, but is instead a mixture of them as perceived by our brain. While some people use violet and purple interchangeably, the two colors are distinct; violet (which is part of the visible spectrum) has a more bluish hue, whereas purple is more red. The cones in our eyes receive inputs, and our brain uses ratios of these inputs to represent subtleties of color. Purple is therefore a complete construction of our brain, as no wavelength represents the color naturally. But purple isn’t alone — the same can be said for other colors such as black and white, as well as particular hues mixed with grayscale, such as pink and brown.

Flag of Dominica flying against tropical hills at dusk.
Credit: Darryl Brooks/ Alamy Stock Photo

Only One National Flag in the World Contains Purple

Expert vexillologists (people who study flags) have noticed a strange color conundrum: Only one national flag in the world contains the color purple, and that flag belongs to the small Caribbean island nation of Dominica. The flag, adopted on November 3, 1978, after the country gained independence from Great Britain, features a green field representing the island’s forests, accompanied by yellow, white, and black crosses. At its center is a red disk with 10 stars (for the 10 parishes on the island) — all encircling the purple plumage of the sisserou parrot (Amazona imperialis), the country’s national bird. Although Nicaragua and El Salvador do feature rainbows on their flags, purple technically isn’t found in a spectral rainbow (see above), so the flag of Dominica stands alone in its purple splendor.

Aerial view of a group of organic purple carrots.
Credit: Mircea Costina/ Shutterstock

Carrots Used To Be Purple

Your average supermarket orange carrot originally evolved thanks to the Dutch during the 16th century. But when the cultivated carrot first appeared some 5,000 years ago in Central Asia, it’s thought that they were often a bright purple rather than the orange we know today. An unsupported myth suggests that the Dutch purposefully cultivated orange carrots to honor their national hero William of Orange, but the more likely reason is that the orange-hued varieties tasted better, stained less, and were overall well adapted to the country’s mild, wet climate. Although you’ll likely have to hunt farther afield than your local Piggly Wiggly, some varieties of carrots today still retain the original purple hue.

Her Majesty the Queen's bottom half of her gown showing purple.
Credit: Print Collector/ Hulton Archive via Getty Images

In Elizabethan England, It Could Be Illegal To Wear Purple

From ancient times until as recently as the 19th century, the color purple was closely associated with royalty — often because they were the only class that could afford such luxury, which was extremely expensive to produce in the days when the color was still made from sea snails. Persian kings and Egyptian rulers wore the illustrious hue, and Julius Caesar similarly donned a purple toga, setting a 1,500-year-long trend for subsequent emperors in Rome and Byzantium.

The color was so intimately tied with the ruling class that the children of kings, queens, and emperors were said to be “born to the purple.” By the 16th century, however, things slowly began to change, as a wealthy merchant class began snatching purple-dyed garments of their own. In 1577, fearing that such lavish spending on “unnecessary foreign wares” could bankrupt the kingdom, Queen Elizabeth I passed sumptuary laws that essentially outlined a strict dress code based on class. Of course, the color purple (and crimson) was reserved for her majesty and her extended royal family, “upon payne to forfett the seid apparel.”

An active image of purple dye in the making.
Credit: Tuayai/ iStock

The First Synthetic Dye Was Purple

Royals and the super-wealthy might have retained their grip on the color purple if not for an 18-year-old British chemist named William Henry Perkin. In 1856, Perkin failed to create a synthetic form of quinine, a compound used to treat malaria. When cleaning out the brown sludge in his beaker with alcohol, he noticed the mixture from the failed experiment turned a brilliant purple — a color he eventually called “mauveine.” This happy accident was the world’s first synthetic dye, and Perkin quickly discovered that his serendipitous creation was immensely cheaper to produce, and lasted longer, than the naturally occurring alternative. The exclusionary tyranny of royal purple was over, and even Queen Victoria herself soon began wearing garments dyed in the brilliant synthetic purple.

Darren Orf
Writer

Darren Orf lives in Portland, has a cat, and writes about all things science and climate. You can find his previous work at Popular Mechanics, Inverse, Gizmodo, and Paste, among others.