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On May 23, 1903, Vermont doctor Horatio Nelson Jackson, along with his mechanic Sewall Crocker, drove down San Francisco’s Market Street, hopped on the Oakland ferry, and traveled east into the history books — the first U.S. cross-country road trip was officially underway. This historical moment was born from a $50 wager to see if Jackson could travel from San Francisco to New York in under 90 days. It’s a wager easily won on today’s 164,000 miles of paved highway, but in the early 20th century, most byways west of Nebraska were little more than dirt roads.

Pit bull isn’t a dog breed.

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The American Kennel Club doesn’t recognize “pit bull” as an official breed. Instead, “pit bull” generally refers to a variety of breeds, including American Staffordshire terriers and American pit bull terriers — all descendants of the English bull-baiting dog.

The challenge was daunting, but Jackson accepted. He didn’t head due east, which would have sent him straight into California’s unforgiving desert, but instead traveled north into Oregon before making a sharp right turn into Idaho, where he picked up his second passenger — a pit bull named “Bud.” Averaging only 71 miles per day in his Winton touring car on the rough western roads, Jackson also had few reliable maps to navigate his way across Idaho and Wyoming. However, once Jackson, Crocker, and Bud entered Nebraska, paved roads appeared with increasing regularity, and the trio could cover 250 miles in a single day.

Yet there were plenty of breakdowns, wrong turns, and other misadventures, and the whole trip took 63 days, 12 hours, and 30 minutes to complete — still well under the original 90-day bet. Jackson was greeted by cheering crowds as the group traveled down the Hudson River in New York toward their final destination. Finally, at 4:30 a.m. on July 26, 1903, the well-worn Winton parked in front of the Holland House hotel in midtown Manhattan. Jackson joyously honked his horn to announce their long-awaited arrival.

Numbers Don't Lie

Numbers Don't Lie

Year Cleveland bicycle manufacturer Alexander Winton founded his eponymous motor car company
1897
Estimated total cost of the famous 1903 road trip, according to Horatio Nelson Jackson
$8,000
Estimated distance (in miles) of the road trip in Jack Kerouac’s “On the Road”
17,527
Number of the longest interstate in the U.S., at 3,020.44 miles
90

The first hybrid car was invented by ______ in 1898, nearly a century before the Toyota Prius.

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The first hybrid car was invented by Ferdinand Porsche in 1898, nearly a century before the Toyota Prius.

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The first person to drive a car long distance was a woman named Bertha Benz.

Karl Benz is often credited as the inventor of the automobile, but few know about his pioneering wife, who made major auto innovations of her own. Her greatest contribution came in August 1888, when — in an effort to prove the importance of her husband’s invention — she set off on a 65-mile journey from Mannheim to Pforzheim, Germany, with her two teenage sons in Benz’s Model III Patent Model Car. Without telling her husband of her plan, Bertha and the boys quietly rolled the car out of the workshop and were soon undertaking the world’s first road trip — traveling at a max speed of 14 miles per hour. The biggest concern was getting enough gas to complete the journey (gas tanks didn’t exist yet), but luckily a pharmacist in Wiesloch, Germany, sold ligroin, a petroleum spirit used as an early motor fuel as well as a chemical solvent for laboratories. Bertha stopped by to top off the carburetor, and today the pharmacy is considered by some to be the world’s first gas station. During this laborious test drive, Bertha also cleaned fuel lines with a hat pin and even insulated an ignition wire with a garter. But most importantly, Bertha’s successful trip proved that Benz’s invention could survive rough roads and still deliver its passengers safely.

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.

Original photo by Yana Tikhonova/ iStock

Like sanitation workers, human pet food testers have a job that inspires a certain degree of stomach-churning but nevertheless provides a valuable service. Think about it: Some 95 million U.S. households own at least one pet, which means there’s a bustling industry for nutritional products that keep our animal companions happy and healthy. And since Fido isn’t likely to elaborate on how his breakfast tastes (satisfying crunch, but a little too much salmon?), the onus is on the two-legged testers to deliver more insightful evaluations.    

Pet food stamped with a “human grade” label should be produced at a facility licensed to prepare human food.

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According to the Association of American Feed Control Officials (AAFCO), pet food labeled “human grade” must be “stored, handled, processed, and transported” in a manner compliant with federal human food laws, while clearly indicating that the food is meant for pet consumption.

As such, pet food testing is a multifaceted role that requires attention to particulars and strong communication skills. Obviously, the products need to be taken into the mouth for tasting, and while some testers claim to actually enjoy eating the food, most simply spit it out after chewing for several seconds. From there, the tester provides detailed reports on the nuances of aroma, flavoring, and texture. They also may be involved in the development of new food formulas and production methodology. It’s a job that requires a distinct set of skills rather than a set education: While a degree in a culinary-related discipline such as nutrition science may help, it’s more important for a would-be employee to demonstrate a passion for the process and a clear ability to differentiate between mouthfuls of gravy chicken chunks from plates A and B.

The pros of this career choice include apparently high levels of job satisfaction: “No two days are ever the same,” noted one longtime taster, who added that he derived joy from helping pets “become happier and healthier.” And the pay isn’t too shabby, either; reports claim salaries can soar to over $100K for experienced testers. The cons? Quality ingredients or not, you’re still required to dig into food you probably wouldn’t touch otherwise. But for those who prefer cold meats to cold calls, it’s not a bad gig.

Numbers Don't Lie

Numbers Don't Lie

Amount spent on pet food and treats by U.S. consumers in 2022
$58.1 billion
Daily recommended grams of crude protein for a 33-pound adult dog
25
Taste buds on the tongue of an average cat
473
Percentage of pet owners who have eaten pet food, per a 2020 survey
8%

The first canned dog food appeared in the U.S. in the 1920s under the brand name ______.

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The first canned dog food appeared in the U.S. in the 1920s under the brand name Ken-L-Ration.

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Yes, pet food is also tested by actual pets.

For all the hoopla over human testers digging into bowls of pet chow, animals continue to hold down a vital place in the food-testing chain for many companies. Although these participants lack the means for detailed analysis, there are tried-and-true methods for determining how well a particular meal might fare on the marketplace using data they provide. Most common are the one-bowl method, which measures how much food is eaten from identical portions of different products over multiple days, and the two-bowl method, in which animals choose between competing options. More complex systems are also used, including one in which dogs are permitted to smell food-filled toys and then indicate their preference when the toys are placed in a random order before them. As with all products that involve animal testing, there are ethical concerns about the treatment of creatures that essentially spend their lives inside pet food facilities, although this issue is at least partially offset by companies that offer test-at-home programs for owners and their pets.

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 StefaNikolic/ iStock

Next time you feel like defying gravity, consider a trip to Hawaii — specifically the island of Oahu, which is home to a reverse waterfall. Also known as the Upside Down Waterfall, Waipuhia Falls sprays up Mount Konahuanui and can be seen from Route 61 (the Pali Highway). The striking effect, visible only during the wet season between November and March, is a result of the island’s strong trade winds. They blow in a northeasterly direction and catch the water before it can reach the bottom, making it look as though the waterfall flows in reverse.

No building on Kauai can be taller than a coconut tree.

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There is indeed a law on the books prohibiting any building on the Garden Isle from being taller than a coconut palm, or roughly four stories.

Though rare, reverse waterfalls do occur elsewhere. Perhaps the most famous is Naneghat, a waterfall in Maharashtra, India, some three hours from Mumbai. It’s at its strongest during monsoon season, from June to September. Similar phenomena have also been observed in places as varied as Utah and Sydney, though most of these are one-off events caused by extreme conditions — not that that makes them any less fascinating to watch.

Numbers Don't Lie

Numbers Don't Lie

Main islands in Hawaii
8
Total islands in Hawaii
137
Year Kamehameha became Hawaii’s first king
1810
U.S. president born in Hawaii (Barack Obama)
1

Oahu’s nickname is ______.

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Oahu’s nickname is the Gathering Place.

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The native language of Hawaii has only 13 letters.

ʻŌlelo Hawaiʻi, the Indigenous language of Hawaii, includes 13 letters — five vowel sounds and eight consonants. Today, it is an official language of Hawaii, along with English. However, the language was once banned — first in 1896, three years after Americans overthrew the Hawaiian monarchy in a coup. That ban was eventually reversed, but ʻŌlelo Hawaiʻi is still considered an endangered language. Today, however, it is experiencing something of a resurgence, in part thanks to the creation of Hawaiian language immersion schools in the 1980s.

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.

Original photo by Kara Capaldo/ iStock

In their first year of life, human babies nearly triple their weight. And while that sounds like an impressive stretch of growth, it’s nothing compared to blue whales. These cetacean newborns, which already weigh around 3 tons at birth, pack on upwards of 200 pounds a day, meaning baby blue whales bulk up at a rate of about 8 pounds an hour. This incredible growth spurt makes sense when you analyze a young blue whale’s diet, which consists exclusively of 100 gallons of its mother’s milk every day — and this isn’t anything like the milk you buy at the grocery store. Where cow-supplied whole milk contains around 3.25% milk fat, a female blue whale’s milk contains up to 50% milk fat. A blue whale calf will nurse with its mother for about seven months until reaching around 52 feet in length and tipping the scales at around 23 tons. 

Blue whales are the largest animals ever known to live on Earth.

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Blue whales aren’t just the largest animals on Earth today — they’re the largest animals ever. A female blue whale can weigh as much as 30 elephants, its heart weighs as much as a gorilla, and its body stretches as long as three school buses end to end.

Although weighing around 400,000 pounds fully grown seems like a drag (literally), it actually comes with numerous benefits. For one, blue whales have almost no natural predators (other than the occasional orca) due to their immense size, and their massive bulk helps them swim faster to feeding and mating grounds. However, unlike other whale species, blue whales need to eat almost constantly — one adult blue whale can consume up to 4 tons of krill daily. In other words, their voracious appetite isn’t so much a childhood fad as it is a lifelong strategy for survival. 

Numbers Don't Lie

Numbers Don't Lie

Maximum estimate of the blue whale population (one of the most endangered of the great whales)
25,000
Average estimate (in years) of the life expectancy of a typical blue whale
85
Year the blue whale was first described, in the book “Phalainologia Nova” by Scottish physician Robert Sibbald
1692
Fraction of a kilogram that equals 1 pound
0.45359

The Roman predecessor of the pound is the ______ (hence the abbreviation “lb”).

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The Roman predecessor of the pound is the libra (hence the abbreviation “lb”).

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Blue whales, among the loudest animals on Earth, are louder than jet engines.

The blue whale is no stranger to superlatives, in terms of size and sound. Scientists estimate these gigantic cetaceans are among the loudest animals in the world. A lion’s roar, for example, clocks in at around 114 decibels, and can be heard up to 5 miles away. Blue whales, however, can emit sounds at an ear-splitting 180 decibels, which is much louder than a jet plane, and can be heard up to 1,000 miles away. Although this is impressively loud, blue whales will also often vocalize rumbling groans as low as 14 Hz, which is below the threshold of human hearing. So even though we can’t always hear it, the world’s oceans are thrumming with the hauntingly beautiful voices of these real-world leviathans.

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.

Original photo by Freaktography/ Shutterstock

On March 5, 1973, several hundred people gathered at a farm in tiny Ossineke, Michigan, to witness a burial they would remember for the rest of their lives. One local grocery store closed its doors so employees could attend; even Michigan Governor William G. Milliken dropped by to pay his respects. Was this a funeral for a native son who made good, or perhaps a beloved civic leader? No, it was a ceremony to bid arrivederci to some 30,000 frozen pizzas that may have been harboring dangerous toxins.

Hawaiian pizza (with pineapple and ham toppings) originated in Hawaii.

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This particular combination of toppings was the brainchild of Greek immigrant Sam Panopoulos, who introduced the Hawaiian pizza at his restaurant in Ontario, Canada, in 1962.

This bizarre scene stemmed from the discovery of swollen mushroom tins at Ohio’s United Canning Company two months earlier. After FDA tests revealed the presence of bacteria that causes botulism, calls to United Canning’s extended branch of customers eventually reached frozen-pizza maker Mario Fabbrini. When two test mice croaked after eating his mushroom pizza, Fabbrini believed he had no choice but to recall his wares from store shelves and swallow the estimated $60,000 in losses. Attempting the pizza equivalent of turning lemons into lemonade, he announced intentions for a grand “funeral,” and arranged for a series of pickup trucks to dump his 30,000 unwanted mushroom pies into an 18-foot hole. After placing a flower garland on the grave — red gladioli to symbolize sauce, white carnations for cheese — Fabbrini served fresh (mushroom-free) pizza to anyone brave enough to partake.

Further tests later showed that the mice had died not from botulism, but from peritonitis, and it was unclear whether their deaths were pizza-related casualties. Sadly, the $250,000 Fabbrini later won in a lawsuit against United Canning and two other defendants wasn’t enough to fully revive his business, and Fabbrini sold the company in the early 1980s. Nevertheless, much like that sauce stain that never entirely disappears from your shirt, the story of the Great Michigan Pizza Funeral endures for those who know where to look. 

Numbers Don't Lie

Numbers Don't Lie

U.S. sales of frozen pizzas in 2024
$7 billion
Percentage of U.S. respondents who liked mushroom pizza toppings in a 2021 survey
54%
Size (in square feet) of the world’s largest pizza
14,000
Approximate number of poisonous mushroom species native to North America
250

Mushrooms are the only nonanimal food product that serves as a significant source of vitamin ______.

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Mushrooms are the only nonanimal food product that serves as a significant source of vitamin D.

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Atari once buried truckloads of its inventory, including a notoriously awful E.T. video game.

Video gamers of a certain age may remember the disaster that was E.T. the Extra-Terrestrial, an Atari 2600 game based on the blockbuster Steven Spielberg movie. Given just five weeks to have the game in stores by the 1982 Christmas season, designer Howard Scott Warshaw developed an ambitious but deeply flawed product, resulting in a poorly reviewed title that contributed to the company’s $563 million in losses in 1983. That September, Atari deposited 13 truckloads of various game cartridges and computer equipment into the city landfill at Alamogordo, New Mexico. Although contemporary newspapers reported on the event, the legend that lingered was that of Atari secretly dumping their unsold E.T. inventory under the cover of darkness to bury the memory of what some called the worst video game ever made. In April 2014, the landfill was excavated as part of the making of the documentary Atari: Game Over; it was called “the first excavation of video games in the history of humanity.” Cartridges of the E.T. game were found alongside other titles, such as Pac-Man and Centipede, as well as decrepit computer parts. Yet unlike Mario Fabbrini and his mushroom pizzas, this story has a happy ending: The sale of items retrieved in the landfill helped raise money for the city of Alamogordo, and Warshaw earned a measure of redemption by receiving a standing ovation after Atari: Game Over screened at Comic-Con that year.

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 shananies/ iStock

Following congressional passage of an “Act to provide a Naval Armament” in March 1794, shipbuilder Joshua Humphreys set about designing six frigates that would form the backbone of the United States Navy fleet. Of those six, the USS Constitution has defied the odds to remain in service, making “America’s Ship of State” the world’s oldest commissioned warship still afloat.

Paul Revere helped build the USS Constitution.

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The famed midnight rider provided the Constitution’s copper and brass fittings from his Boston foundry in the 1790s, and was later tapped to replace the ship’s copper sheathing during an 1803 refitting.

Launched from Boston Harbor on October 21, 1797, the Constitution was soon deployed to the Caribbean to engage privateers during the Quasi War with France. A few years later, the 44-gun frigate was instrumental in a military campaign against the state-supported Barbary Pirates of North Africa, resulting in an 1805 treaty with Tripoli. But the Constitution truly proved its worth with an impressive showing against the mighty British navy in the War of 1812. One overwhelming victory over the HMS Guerriere, which seemed unable to dent the American frigate with its cannon fire, gave the ship its nickname: “Old Ironsides.” A few months later, the Constitution took down the HMS Java despite having its wheel blown off in battle, requiring crew members to manually move the tiller for steering. These heroic stands were still in the minds of the American public as the Constitution was reported to be nearing the end of its service life in 1830, resulting in a national campaign to keep the beloved warship in active duty.

After patrolling the African coast for slave vessels during the 1850s, Old Ironsides was primarily used as a training ship before being decommissioned in 1881. A grand centennial celebration in 1897 underscored its status as a national icon, and in 1931, the historic ship was recommissioned for Navy service. Now docked at the Charlestown Navy Yard in its city of birth, the USS Constitution remains a venerable component of the powerful naval force it helped usher into existence more than 200 years ago.

Numbers Don't Lie

Numbers Don't Lie

Displacement (in tons) produced by the USS Constitution
2,200
Cost to build the USS Constitution (about $7.3 million today)
$302,718
Ships in the U.S. Navy’s battle force, as of May 2026
291
Launch year of the U.K.’s now-dry-docked HMS Victory
1765

The tribute poem “Old Ironsides” was composed by American writer (and doctor) ______.

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The tribute poem “Old Ironsides” was composed by American writer (and doctor) Oliver Wendell Holmes Sr.

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The first papal visit to U.S. soil took place aboard the USS Constitution.

While the Constitution was stationed off the coast of Naples in the summer of 1849, Captain John Gwinn informed his squadron commander, Commodore Charles W. Morgan, of a special request to host a visit from Pope Pius IX and King Ferdinand II of the Two Sicilies. Absolutely not, was the reply — with the Papal States then enmeshed in political turbulence, Commodore Morgan had no intention of disrupting a professed stance of neutrality. However, after a U.S. ambassador received another personal request from Ferdinand, Captain Gwinn took the Constitution to the port of Gaeta to receive the pontiff and king on August 2. Along with visiting every part of the ship over the course of three hours, Pope Pius delivered benediction to the Catholic crew members and managed to overcome the temporary crisis of being seasick. Commodore Morgan wrote a letter of disapproval to the Navy Department, but Capitan Gwinn died of gastritis the month after the papal visit, and never suffered any earthly consequences from it.

Tim Ott
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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 omersukrugoksu/ iStock

It takes some audacity to be named the Great Lakes. After all, there are millions of lakes on planet Earth. But when it comes to North America’s fascinating freshwater system, the adjective “great” is well earned. Consisting of five lakes — Huron, Erie, Superior, Ontario, and Michigan — the Great Lakes stretch some 94,600 square miles, making them one of the largest surface freshwater systems in the world. In fact, these lakes are so big that they include more than 20% of the world’s surface fresh water, or 6 quadrillion gallons of it. That’s so much water that if you spilled the entire contents of the Great Lakes throughout the Lower 48, the entire contiguous U.S. would be submerged in nearly 10 feet of water. 

All the Great Lakes are located in both the U.S. and Canada.

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Of the five Great Lakes, four of them — Erie, Huron, Superior, and Ontario — are shared between the U.S. and Canada. However, Lake Michigan lies entirely within the borders of the U.S.

With such an abundance of fresh water and natural resources, the Great Lakes have been a hotbed for human habitation. But over the years, increasing activity around the lakes has led to an onslaught of industrial, urban, and other pollutants, as well as more than 100 non-native and invasive species that have damaged their ecosystems. Because less than 1% of the water in the Great Lakes leaves the system each year, pollution can linger for a very long time. Today, environmental organizations and government agencies in both the U.S. and Canada are working together to make sure the Great Lakes stay “great.”

Numbers Don't Lie

Numbers Don't Lie

Percentage of the world’s fresh water held in ice caps and glaciers
68.7%
Estimated number of shipwrecks in the Great Lakes
6,000
Lakes in Canada at least 25 acres in size (the most in the world)
879,800
Fish species in the Great Lakes
80+

The largest freshwater lake by volume, ______, is also the world’s deepest and oldest.

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The largest freshwater lake by volume, Lake Baikal, is also the world’s deepest and oldest.

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Titan, one of Saturn’s 82 moons, is the only other world with surface-level lakes, but they’re filled with methane — not water.

As far as we know, there are only two places in our solar system where you’ll find a lake: Earth and Saturn’s largest moon, Titan. At first glance, the two worlds couldn’t be more different. Titan’s mass is 1/45th of Earth’s, its surface temperature hovers around -292 degrees Fahrenheit, and one day on Titan lasts nearly 16 Earth days. But there are a few similarities. One is that, like Earth, Titan has a weather system that seems to involve rain pouring from clouds and pooling into oceans, rivers, and lakes — and some of these lakes can be absolutely huge. Titan’s lake Kraken Mare, for example, is nearly the size of all the Great Lakes combined and could be up to 1,000 feet deep. But instead of water in this massive lake, Kraken Mare (like all of Titan’s other lakes) is filled with liquid ethane and methane. While methane exists as a gas on Earth, it’s a liquid on Titan, thanks to the freezing temperatures, as is its fellow hydrocarbon ethane. But you probably don’t want to try swimming in Titan’s lakes, even if you could somehow withstand the temperatures — methane is less dense than water, which means if you cannonballed into Kraken Mare, you’d sink like a rock.

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.

Original photo by Alexander Lukatskiy/ Shutterstock

Although 75% of volcanoes are found in the Ring of Fire — a tectonic belt stretching 25,000 miles from Asia up to Alaska and down South America — every continent on the planet is home to volcanoes, whether they were created through continental rifts (as in the Ring of Fire) or magma hot spots (like Hawaii’s volcanoes). However, no active volcanoes can currently be found on the mainland of the Land Down Under, although it is home to some extinct volcanic specimens. This is because the continent is missing tectonic plate boundaries. It’s at these boundaries — where two tectonic plates meet — that most volcanoes form. Instead, Australia rests squarely on the Australian Plate.

The word “volcano” was inspired by the name of a Roman god.

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In Roman mythology, Mount Etna, a volcano on the east coast of Italy, was the fiery furnace for the god of fire: Vulcan. “Vulcano,” in Italian, means “burning mountain,” and Mount Etna became the first place called by such a name.

Although Australians might feel like they’re missing out, the country technically has two active volcanoes in its outlying external territories, on Heard Island and McDonald Island, located some 2,485 miles southwest of Perth. But with both islands uninhabited — and a two-week boat ride being the only way to get there — few Australians (or anyone else for that matter) will ever lay eyes on the country’s remote volcanic exceptions. 

Numbers Don't Lie

Numbers Don't Lie

Height (in feet) of Mount Kosciuszko, the highest point in mainland Australia
7,310
Diameter (in miles) of Australia’s Tweed Volcano
63
Ratio of the world’s population that lives in the danger zone of active volcanoes
1:20
Estimated percentage of Earth’s landmass created from volcanoes
80%

The country with the most active volcanoes is ______.

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The country with the most active volcanoes is Indonesia.

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Australia was a part of Antarctica only 30 million years ago.

Although both are in the Southern Hemisphere, Australia and Antarctica seem to have nothing in common. Australia is well known for its scorching deserts, which make up nearly 20% of its landmass, and it’s filled with some of the most amazing animal life on Earth. Antarctica, on the other hand, is extremely cold, and it’s home to only one native insect. However, dig into each continent’s geologic past, and you’ll find that they were once part of a larger landmass known as Gondwana. That was true only 30 million years ago — a relative stone’s throw in Earth’s 4.6 billion-year-long existence. In fact, fossil records in the Antarctic even show that it was once home to marsupials.

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.

Original photo by Anusorn Nakdee/ Shutterstock

In Greek mythology, a chimera is a part-lion, part-goat, part-snake, all-weird monstrosity, but in scientific circles, the name takes on a different meaning. In biology, a chimera is anyone whose body contains genetically distinct cells. This doesn’t mean that another small organism is living inside you; rather, cells wholly different from your cells coexist within you. In fact, a kind of chimerism is fairly common. New mothers carry some of the cells of their offspring, which can remain within their body for up to 40 years. This exchange of cells is also a two-way street, as children often contain some of their mother’s cells, which cross the placenta and into the child’s bloodstream during pregnancy. However, not many cells reside in a mother and her offspring, so scientists refer to this phenomenon as “microchimerism.” 

A person with two different-colored eyes is a chimera.

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While a person with two distinct eye colors may be a chimera, there are many ways for this phenomenon to occur. Sometimes, family DNA, trauma, disease, injury, and other forms of genetic mutation can affect the pigment, or melanin, that determines eye color.

A more dramatic form of human chimerism is when two embryos that would usually form nonidentical twins instead fuse in the womb, and the resulting single embryo contains cells of both. While this can have some outward effects (like different-colored patches of skin on one person), most of the time this condition is discovered through genetic testing. In one bizarre case in 2003, a 52-year-old mother needed a kidney transplant, and when her children were tested for compatibility, the results showed that two of her three children were not hers genetically. This is because she was a chimera, having fused with her twin embryo before birth, and the doctors didn’t think to search for a second genetic marker in other parts of her body. That makes this confused mother only 1 out of 100 or so confirmed chimera cases worldwide, but more are likely out there.

Numbers Don't Lie

Numbers Don't Lie

Year scientists created the first human-pig chimera for transplantable organs
2017
Number of lines in Greek poet Hesiod’s “Theogony,” which contains a detailed description of chimera
1,022
Year the first case of a natural human chimera was reported
1953
Average cells in an adult human female (men contain 36 trillion cells on average)
28 trillion

In the “Iliad,” Homer mentions the slaying of the mythical chimera by the Greek hero ______.

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In the “Iliad,” Homer mentions the slaying of the mythical chimera by the Greek hero Bellerophon.

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Plants can also be chimeras.

Chimeras aren’t confined to the animal kingdom; fruits and vegetables can also be chimeras or bud sports. Chimeras are when an organism contains two distinctly different tissues, whereas a bud sport is a singular genetic deviation from the rest of the plant, often caused by a spontaneous mutation. The effects of chimerism can result in some strange characteristics, as in the case of an apple that went viral in New Zealand in 2026 for its half-red, half-yellow appearance.

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.

Original photo by Emanuela Casula/ iStock

When debating the best pasta shape, a few classic heavyweights are bound to be in the mix: spaghetti, penne, rigatoni, tortellini, and, of course, gnocchi. All of these can easily be made by millions of people worldwide, even those who aren’t fortunate enough to have a nonna in their life. This distinguishes those types from su filindeu, the world’s rarest pasta, which, at one point, only three people knew how to cook — all of whom belonged to the same family.

“Linguine” means “long hair.”

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It's a fib

It actually means “little tongues.” And it’s not the only pasta shape named for a body part — “orecchiette” means “little ears.”

Today, a handful of people carry on the tradition. One of them is Paola Abraini, who lives in the small Sardinian city of Nuoro and wakes up at 7 a.m. to begin making “the threads of god,” as the pasta has been nicknamed. The recipe has been passed down in her family for more than three centuries, though they don’t exactly keep the secret under lock and key. In recent years, Abraini’s family has begun teaching others to prepare the pasta in an effort to preserve the recipe. At least two chefs in Los Angeles and one in Singapore even serve it in their restaurants. And anyone with half an hour to spare can watch a detailed instructional video about su filindeu — they just probably won’t be able to accurately replicate Abraini’s work. 

Such was the case when engineers from Barilla visited Abraini and unsuccessfully attempted to reproduce the pasta. That's likely because the process requires folding semolina dough into 256 perfectly even strands before stretching them diagonally across a circular frame in a three-layer pattern. There are only three ingredients — semolina wheat, water, and salt — but Abraini insists the most important ingredient is elbow grease.

Numbers Don't Lie

Numbers Don't Lie

Total number of pasta shapes
400+
Pounds of pasta eaten per capita in Italy each year
51
Pounds of spaghetti that filled a swimming pool to set a world record in 2010
13,786
Original length (in centimeters) of spaghetti strands
50

“Pasta” comes from the Italian word for ______.

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“Pasta” comes from the Italian word for paste.

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Thomas Jefferson loved macaroni and cheese.

Before he became president, Thomas Jefferson was a foodie. “The best pasta in Italy,” he wrote in 1787, “is made with a particular sort of flour, called Semola, in Naples.” He was so impressed with “maccaroni” (as he spelled it) during his time in Italy that he had a macaroni mold maker shipped to him from Naples.

A recipe for macaroni and cheese in Jefferson’s own handwriting survives, though it was likely dictated to him by one of his enslaved chefs. It calls for whoever makes it to “work [the ingredients] together without water, and very well” and then “cut it into small peices [sic] which roll again with the hand into long slips, & then cut them to a proper length.” The founding father even served the dish during a state dinner in 1802.

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.