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French cuisine is often considered the epitome of fine dining, and that could be because French cooks are said to have launched the modern restaurant — and even to have invented the word “restaurant” itself. Many etymologists and historians attribute the origins of both to A. Boulanger, a Parisian soup vendor who set up shop in 1765. Boulanger peddled bouillons restaurants — so-called restorative meat and vegetable broths, from the French restaurer, meaning “to restore or refresh” — an act that wasn’t entirely revolutionary, since other cooks were selling healing soups from “health houses” around the same time. But Boulanger’s approach was different because he also offered a menu of other meals at a time when most taverns and vendors served just one option, dictated by the chef. Boulanger’s concept of seating guests and allowing them to choose their desired meal exploded in popularity after the French Revolution at the end of the 18th century, as kitchen workers who formerly served aristocratic households set up their own dining rooms or joined new eateries. By 1804, French diners could choose from more than 500 restaurants across the country.

Waffle House has its own record label.

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Waffle House doesn’t just sling breakfast; the 24-hour diner has also pressed its own jukebox records since the mid-1980s. Restaurant-themed songs across genres (such as gospel, bluegrass, and R&B) are released under the Waffle Records label and exclusively played at the chain’s diners.

Some historians disagree with this long-told tale of the restaurant’s origin, suggesting there isn’t much evidence by way of historical documentation to prove Boulanger was a real person. And others believe attributing the public dining room to French ingenuity isn’t wholly accurate, since humans have been offering up their cooking talent to the hungry masses for millennia. Take, for example, how Chinese chefs in major cities such as Kaifeng and Hangzhou customized menus to appeal to traveling businessmen looking for familiar meals nearly 700 years before France’s iteration of the restaurant. Or the excavated ruins at Pompeii dating to 79 CE that include ornately decorated food stalls called thermopolia, where hungry Romans could choose from a variety of ready-to-eat dishes. Though the names have differed, smart humans have been selling snacks to each other for a long, long time.

Numbers Don't Lie

Numbers Don't Lie

Year Restaurante Botín, the world’s longest-operating restaurant, opened in Madrid
1725
Auntie Anne’s pretzel franchises once owned by basketball star Shaquille O’Neal
17
Seasons of celebrity chef Guy Fieri’s “Diners, Drive-ins & Dives” TV show, as of 2026
55
Cost of Tanbo R-1 and R-2, the first robot waiters employed in a U.S. restaurant, in 1983
$40,000

Founded in 1921, ______ is America’s oldest fast-food burger restaurant.

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Founded in 1921, White Castle is America’s oldest fast-food burger restaurant.

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The first American diners were mobile.

Most of the diners Americans patronize today are stationary spots, but the country’s earliest greasy spoons were more like modern food trucks. First called “night lunch wagons” by Rhode Island inventor Walter Scott in 1872, the horse-drawn diners served hot meals to patrons who were often late-shift workers or partiers looking for meals long after other restaurants had closed. Soon after, ingenious restaurateurs developed rolling eateries complete with seats, some providing both a meal and transportation to hungry diners looking to travel across town. By the 1890s, trains began incorporating the concept (ticket holders were previously responsible for supplying their own meals), debuting dining cars that fed patrons on long journeys across the growing West. The original dining carriages, however, quickly fell out of style; maintenance costs, city bans, and competition from brick-and-mortar restaurants pushed many proprietors out of business by the early 1900s. Those that survived swapped their carts for permanent locations often resembling their original carts or made from modified railroad dining cars — an iconic look that remains today.

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.

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Enlisting animals into military service isn’t entirely unusual — dolphins have been used for underwater surveillance and even camels have helped haul supplies. Those successes could be why a Coast Guard program meant to train pigeons for search and rescue missions was able to get off the ground in the late 1970s. Project Sea Hunt’s goal was to more easily (and quickly) find people lost at sea using trained pigeons to act as real-time spotters. Despite their reputation as nuisance fowl, pigeons are easily trainable creatures with outstanding eyesight; they (like many birds) may even have better vision than humans, thanks to their ability to see UV light.

There’s no scientific difference between pigeons and doves.

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There’s not much difference between the birds beyond their name; the word “dove” has Nordic origins, while “pigeon” comes from French. Both birds belong to the Columbidae family and are often categorized by size, but the use of the terms is often subjective.

Pigeons selected for the program underwent six months of training to spot yellow, orange, and red objects in the ocean (the most common colors for flotation devices and rafts), and were then placed in special pigeon chambers underneath helicopters that had a view of the water below. When the trained birds spotted a bright color, they could signal to Coast Guard pilots above by pecking a special pedal that flashed a signal in the cockpit. Test runs found that the pigeons were able to spot targets 90% of the time, compared to the human success rate of just 38%. The pigeons were also faster than their human counterparts, spotting potential victims before humans did 84% of the time.

Despite these successes, Project Sea Hunt was shuttered due to federal budget cuts in the early 1980s. In the years since, the Coast Guard has combined flyovers, ocean-tracking software, and other methods to quickly and safely rescue those lost at sea.

Numbers Don't Lie

Numbers Don't Lie

Known species of pigeons
300+
Year the Revenue-Marine, the precursor to the U.S. Coast Guard, was established
1790
Average number of search and rescue missions performed by the Coast Guard daily
45
Distance (in miles) racing pigeons can travel in one competition
600+

The last known passenger pigeon, named ______, lived to be 29 years old.

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The last known passenger pigeon, named Martha, lived to be 29 years old.

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A pigeon saved the lives of nearly 200 American soldiers during World War I.

Pigeons are known for their supreme navigation skills (and for being easily trainable), which is why the U.S. Army relied on them to deliver crucial information during World War I when communication lines were down. The best-known winged warrior, Cher Ami, completed 12 message relays, one of which saved 194 American soldiers in October 1918. The famous flight delivered a message from the 77th Division, a battalion of American soldiers isolated in France’s Argonne Forest behind German lines and suffering from a heavy bombardment of friendly fire. Sending Cher Ami into the sky was risky, since the unit’s other pigeons had been shot down; miraculously, Cher Ami sustained injuries to his chest and leg but returned to the sky, traveling 25 miles in under 30 minutes to deliver information about the battalion’s position that stopped the bombardment. Army medics were able to save Cher Ami, who was retired from service and honored with a Croix de Guerre medal from the French government for his efforts. More than 100 years later, the preserved messenger pigeon is kept on display at the Smithsonian’s National Museum of American History.

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.

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When it comes to the American flag, it’s not just about 13 stripes and 50 stars — the number 27 also has an important meaning. That’s how many different versions of Old Glory have been officially recognized since the nation began. The inaugural 13-star, 13-stripe flag was approved by the Continental Congress on June 14, 1777, and later underwent an update in May 1795. That redesign — due to Vermont and Kentucky joining the Union — featured 15 stars and 15 stripes. While the number of stripes initially continued to increase as more states were admitted, the government reverted back to 13 stripes in 1818, representing the original 13 colonies, and let the stars represent the number of states instead. The current and 27th official design was adopted on July 4, 1960, after Hawaii’s admission into the United States. It is the only version in U.S. history to remain unchanged for over 50 years.

Most historians think Betsy Ross designed the American flag.

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Though many schoolchildren learn about Betsy Ross sewing the first American flag — and making some key design changes — the story surfaced years after her death. Many historians credit Philadelphia-born judge, satirist, and artist Francis Hopkinson with designing the first flag.

Though there have been 27 official versions of the flag, there have also been some well-known yet unofficial variations. These include the Grand Union, the flag of the Revolutionary-era Continental Army, first raised in 1776 at the command of George Washington and featuring a 13-stripe design coupled with the Union Jack in place of where the stars now sit. Just a few years later, in 1789, a 13-stripe, 12-star layout that predated Rhode Island ratifying the Constitution was flown; it’s now considered one of the rarest unofficial flags ever, and only one example is thought to still exist. A 39-star flag was mass-produced around 1875 in anticipation of the Dakotas being admitted as one joint state, but in 1889 — after 14 years of unsanctioned use — the flag became obsolete when Congress decided to split the Dakotas in two.

Numbers Don't Lie

Numbers Don't Lie

American flags planted on the moon
6
Symbolic folds on an official military flag
13
Stanzas in “The Star-Spangled Banner”
4
Year the flag’s star pattern was standardized into six rows
1912

The first state to observe Flag Day as an official holiday was ______.

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The first state to observe Flag Day as an official holiday was Pennsylvania.

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The current American flag was designed by a high school student.

In 1958, at a time when Alaska and Hawaii seemed likely to join the United States, a class at Lancaster High School in Ohio was tasked with creating a show-and-tell project related to American history. One student, Robert G. Heft, decided to make a new 50-star flag, spending 12 hours cutting out and sewing on stars in a pattern that included five rows of six stars and four rows of five stars. Alas, he received a lowly B-. Despite the negative reception, Heft gave the flag to local congressman Walter Moeller, who lived nearby and promised to take Heft’s design to Washington, D.C. That promise paid off in a big way, as two years later Heft received a phone call from President Eisenhower himself. The president informed Heft that his design had been chosen for the new national flag. Heft’s creation was among an estimated 1,500 considered, and though many others featured a near-identical pattern, he ultimately received credit upon the flag’s adoption on July 4, 1960. In the wake of Eisenhower’s decision, Heft’s teacher retroactively raised his grade to an A.

Bennett Kleinman
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Bennett Kleinman is a New York City-based staff writer for Inbox Studio, and previously contributed to television programs such as "Late Show With David Letterman" and "Impractical Jokers." Bennett is also a devoted New York Yankees and New Jersey Devils fan, and thinks plain seltzer is the best drink ever invented.

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Some states have no official languages. Hawaii has two. The Aloha State has officially recognized two state languages — English and Hawaiian — since 1978. Hawaiian is a Polynesian language with just 13 letters and was the main language spoken in the Pacific island chain long before it became a U.S. state. However, as in many Indigenous communities that experienced forced assimilation, by the late 19th century Hawaiians were often prohibited from using their own language. The first ban on speaking Hawaiian in schools appeared in 1896, three years after the U.S. became involved in overthrowing the Hawaiian monarchy; two years later, English became Hawaii’s official language when the islands became a U.S. territory. 

Hawaii grows most of the world’s pineapples.

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Pineapples are synonymous with Hawaii, and at one time, 75% of the world’s pineapples were grown on the island. However, pineapple farming began to decline around the mid-1960s. Today, Indonesia, the Philippines, and Costa Rica are the biggest pineapple producers.

By the 1960s, activists began fighting to preserve parts of Hawaiian culture they feared were slipping away, including music and dance, but most importantly the Hawaiian language. Their efforts were rewarded in 1978 when the state constitution was amended to make Hawaiian an official language; the move also gave weight to many legal documents that were originally drafted in Hawaiian before it was banned. Then, in 1990, nearly 100 years after Hawaiian was first banned in schools, the U.S. government passed legislation to help support language learning and the preservation of Hawaiian and other native tongues. Today, many Hawaiians attend immersion schools to study the language, and a survey in 2016 found that about 18,000 people speak the language, along with English, on a daily basis.

Numbers Don't Lie

Numbers Don't Lie

Year Hawaii became the 50th U.S. state
1959
Major islands in the Hawaiian archipelago
8
Approximate distance (in miles) between Hawaii and the U.S. mainland
2,400+
Active volcanoes on the islands of Hawaii and Maui
5

Hawaii’s smallest major island, ______, is uninhabited.

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Hawaii’s smallest major island, Kahoolawe, is uninhabited.

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Alaska has 21 official languages.

Today, three states — Hawaii, South Dakota, and Alaska — have more than one official language, though Alaska has the most. In 2014, the northernmost state passed a law recognizing 20 Indigenous languages as official tongues, including Tlingit, Koyukon, and Central Yup’ik, along with English. However, Alaska has far more Native languages than have been made “official,” with nearly 100 dialects found throughout the state. Generally, languages are broken into two main language groups — the Inuit-Yupik-Unangan and the Na-Dene. Both language families have been researched and documented since the 1970s by language preservation groups. However, few of these tongues were written down or recorded, and many have since become rarely spoken or lost, which is why Alaska’s governor issued a state emergency in 2018 to promote Indigenous language learning in public schools.

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.

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On July 3, 1776, John Adams wrote to his wife Abigail of how “[t]he Second Day of July 1776, will be the most memorable Epocha, in the History of America. … It ought to be solemnized with Pomp and Parade, with Shews, Games, Sports, Guns, Bells, Bonfires and Illuminations from one End of this Continent to the other from this Time forward forever more.” It seems the founding father felt pretty strongly that July 2 would be recognized as the landmark date of this young nation’s founding. So why do Americans celebrate independence two days later?

The Committee of Five’s Robert Livingston never signed the Declaration of Independence.

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Livingston was in New York when the signing happened, and never got the chance to add his signature to the document.

Let’s back up to June of 1776, when the Second Continental Congress selected a Committee of Five — Adams, Roger Sherman, Robert Livingston, Benjamin Franklin, and Thomas Jefferson — to draft a statement of independence that severed the colonies from British rule. When the Jefferson-penned draft was presented to Congress, only nine of the 13 colonies favored independence. However, the delegates largely fell into line from that point, and on July 2, Congress formally approved the resolution that proclaimed the United States of America as an independent country. Following additional edits, the Declaration of Independence was completed, adopted, and sent for printing on July 4, and on August 2, the rank-and-file delegates began adding their signatures to an engrossed version of the document.

According to historian Pauline Maier, the idea of commemorating the anniversary of independence didn’t gain any traction in 1777 until it was too late to recognize the date of July 2. However, a pair of notable celebrations popped up on July 4 — fireworks in Boston, a military demonstration and more pyrotechnics in Philadelphia — setting forth an annual tradition that, as Adams otherwise correctly predicted, came to mark “the most memorable Epocha, in the History of America.”  

Numbers Don't Lie

Numbers Don't Lie

Delegates who signed the Declaration of Independence
56
Grievances cited against the British monarchy in the Declaration
27
Changes made to Thomas Jefferson’s original Declaration draft, including by the Committee of Five
86
Pounds of fireworks annually detonated on July 4
285,300,000

The final delegate to sign the Declaration of Independence is believed to have been ______.

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The final delegate to sign the Declaration of Independence is believed to have been Thomas McKean.

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Thomas Jefferson drew from similar sources to draft the Declaration of Independence.

Faced with a limited time frame to pen the first draft of the Declaration of Independence in June 1776, Jefferson culled ideas from the nearly 100 such documents that had recently been issued throughout the colonies. Among them was the Virginia Declaration of Rights by George Mason, which featured language strikingly similar to the Jeffersonian assertion that “all men are created equal” and possessed the right to “Life, Liberty and the pursuit of Happiness.” Unhappy with the subsequent congressional edits to his writing, which included the excision of a passage that blamed King George III for the proliferation of slavery in the colonies, Jefferson nevertheless took pride in his hastily crafted yet resonant words at a tipping point of American history. As he later wrote in a letter: “This was the object of the Declaration of Independence. Not to find out new principles, or new arguments, never before thought of, not merely to say things which had never been said before; but to place before mankind the common sense of the subject; in terms so plain and firm, as to command their assent, and to justify ourselves in the independent stand we are compelled to take.”

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.

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In the United Kingdom, black currants are a go-to flavor for candies, beverages, and some medications, but less than an estimated 1% of Americans have ever sampled the fruit. The small, purple-black berries (which taste like a blueberry-cranberry blend) grow in clusters on the Ribes nigrum bush and were once enjoyed by American colonists and early presidents. In 1899, an estimated 12,000 acres of commercial farmland were dedicated to the crop, which was harvested for wine, baked into pies, and preserved as jam. However, the success of American black currants was short-lived, thanks to an ecological snafu. 

Black currants can prevent scurvy.

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Black currants are high in vitamin C, a deficiency of which causes scurvy. During World War II, when import blockades made citrus harder to find, the British government distributed Ribena — a black currant juice beloved by Brits — as a vitamin C supplement.

In the early 1900s, researchers discovered that pine trees near black currant plantings often became sick with a type of fungus known as white pine blister rust. The disease causes lesions on branches and trunks; as the blisters spread, the tree begins to die, and its evergreen needles turn a rusty hue. In an effort to protect the white pine logging industry — one of the most valuable in the nation at the time, and worth up to $1 billion — Congress banned black currants in 1911, going so far as to destroy currant farms with herbicides. Five decades later, botanists lobbied in favor of a return to currant farming, arguing that newly developed bushes were disease-resistant and posed little risk when planted away from pine trees. But despite federal approval for growing the currants in 1966, many states upheld their bans. Connecticut’s 1929 law fined anyone in possession of currant plants up to $25 until 1988, and New York — the top currant producer of old — held out until 2003. Today, black currants are making a slow comeback, with berry farmers in New York, Minnesota, Connecticut, and elsewhere hoping these fast-growing vines will be restored to their former glory.

Numbers Don't Lie

Numbers Don't Lie

Species of shrubs in the Ribes family, including currants and gooseberries
150-200
Species of North American pine trees that are susceptible to white pine blister rust
14
Percentage of the world’s currant crop commercially grown in Europe
99%
Safe distance (in feet) needed between currants and pine trees to prevent disease transmission
1,000

Black currant Skittles are replaced with ______-flavored candies in the U.S.

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Black currant Skittles are replaced with grape-flavored candies in the U.S.

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Bristlecone pine trees keep their needles for 30 years.

Pine trees are known among arborists for their longevity, with some species living 300 to 500 years. Bristlecone pines are especially long-lived, with the slow-growing elders of the species reaching nearly 5,000 years old. Bristlecones are in no rush to grow, a feature that helps these hardy conifers survive in challenging climates. Primarily found among the Sierra Nevada and Rocky Mountains, the trees survive despite short growing seasons, often intensely cold temperatures, rocky soils, and winds that form their trunks and branches into gnarly twists. To thrive, the trees conserve much of their energy by retaining their needles; unlike other pine trees that replace their bristly leaves every two to seven years, bristlecones hold on to their needles for about 30 years or more.

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 Bigone/ Shutterstock

The evolutionary philosophy of elephants might be described as “go big or go home.” Elephants are the largest land animals on Earth, sport the largest ears of any living creature, and are all-around the strongest mammals by a long shot. But their most famous feature (and the inspiration behind the name of their taxonomic order, Proboscidea) is their trunk, which can grow to 6 feet long. The trunk is central to an elephant’s survival, helping it breathe, smell, eat, and drink, and it’s controlled by a network of 40,000 muscles. By comparison, the human body has only around 650 muscles total

The smallest human muscle is found in the hand.

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Although our hands are an impressive patchwork of muscles, the smallest skeletal muscle in the human body is in our inner ear. Called the stapedius, this mini muscle is only 2 millimeters long and supports the body’s smallest bone — the vibration-conducting stapes.

But its large collection of muscles is only the beginning of an elephant trunk’s impressive capabilities. For one thing, the animal’s sense of smell is second to none — it’s been reported that elephants can smell water up to 12 miles away. One reason for this is that elephants have more scent receptors and a bigger olfactory bulb than any other living mammal (see: “go big or go home”), but this capability is helped along by the fact that an elephant trunk is essentially a sniffing antenna that can investigate smells closely and accurately. Elephants are also the only mammals that can remain submerged deep in the water but still breathe, thanks to their snorkeling trunks. Some scientists hypothesize that the modern elephant’s water-wading ancestors possibly developed long trunks for this very purpose. All in all, the elephant trunk is a biological masterpiece some 40 million years in the making.

Numbers Don't Lie

Numbers Don't Lie

Species of elephants (African savanna/bush, African forest, and Asian)
3
Percentage of a lion’s body made up of skeletal muscle, the highest of any mammal
58.8%
How fast (in miles per hour) an elephant’s trunk can suck water
330
Year Jean de Brunhoff wrote “Histoire de Babar,” starring an elephant in the titular role
1931

The strongest animal relative to its size is the ______, which can lift 1,141 times its weight.

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The strongest animal relative to its size is the horned dung beetle, which can lift 1,141 times its weight.

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The elephant’s closest living relatives look nothing like it.

From their gargantuan size to their matriarchal social structure, elephants are truly unique creatures in the animal kingdom. In fact, their closest living biological relatives look nothing like them — one lives in the sea, and the other weighs only about 10 pounds. Sirenians, known less elegantly as “sea cows” (which includes manatees and dugongs), share a common ancestor group with elephants, one that died out around 50 million years ago and was likely a wading animal that lived near water. The elephant’s other close relative, the rock hyrax (Procavia capensis), looks more like a rodent than any sort of lumbering land giant. However, upon closer inspection, the rock hyrax and elephant do share similar toes, wrists, and skull structures. The rock hyrax also has oversized incisors that act similar to elephant tusks. When it comes to nature, there’s always much more than meets the eye.

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.

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Few people in history are credited with saving millions of lives, but one person who did so worked for Volvo. Swedish engineer Nils Bohlin’s improvement on the three-point seat belt has helped drivers (and passengers) safely reach their destination for more than six decades. 

Seat belts are a standard feature in today’s cars and trucks, but it hasn’t always been that way. Early on, car manufacturers weren’t required to include safety belts in vehicles. When they were built in, the earliest seat belts were simple two-point restraints that secured across the waist (aka lap belts). While a step in the right direction, lap belts had some downsides — they didn’t protect the upper body during a collision and could even cause injuries during high-speed crashes. A three-point design was created in 1951 by Americans Roger W. Griswold and Hugh DeHaven, but it never took off, likely because it was uncomfortable.

The first airbags were invented by two dentists.

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Modern airbags are far more advanced than the earliest “air cushions” designed by two British dentists during WWI. Concerned about jaw injuries, Harold Round and Arthur Parrott patented their airbags in 1920.

Recognizing these issues, Swedish carmaker Volvo hired Bohlin (a former aviation engineer who helped create pilot ejection seats) as the company’s safety engineer, and tasked him with a redesign. Bohlin’s creation — a more comfortable V-shaped belt that stays in position across both the chest and hips — was drafted in under a year, and is the style used in cars today. Volvo quickly added the belts to its cars in 1959, before the inventor even secured a patent. But when he did, Bohlin and Volvo didn’t look to profit off the safety feature. Instead, they released the design publicly, urging all car manufacturers to add the upgraded belts. After years of presentations and crash test dummy demos, Volvo eventually made headway — the evidence of which is found in our cars today and credited with saving lives around the world.

Numbers Don't Lie

Numbers Don't Lie

Year inventor Edward J. Claghorn received the first patent for an automobile seat belt
1885
Time (in seconds) it takes a car’s airbag to deploy during an accident
0.05
Year the first children’s car seat with a safety harness was invented
1962
Percentage of Americans who regularly use a seat belt, as of 2022
91.6%

In 1984, ______ became the first state to require seat belts.

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In 1984, New York became the first state to require seat belts.

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The first crash test dummy was named Sierra Sam.

The National Highway Traffic Safety Administration relies on a whole crew of crash test dummies to better understand the mechanics of collisions and to make car travel safer. Each one of those mannequins is a descendant of Sierra Sam, the very first research dummy. Introduced in 1949, Sierra Sam was the work of Samuel W. Alderson, a physicist and inventor who developed motors for missile guidance systems during World War II and motorized prosthetic arms for IBM. Alderson’s first dummies were used by the U.S. military to test pilot helmets and harnesses, parachutes, and plane ejection seats. Sierra Sam even made his way into NASA’s tests for the Apollo space capsule. Alderson then developed a dummy, called the VIP-50, for automobile testing in 1968. In the years since, dummies have been improved and packed with technology and sensors that today require up to five months of construction and $1 million in costs.

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.

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Evolution has devised a mind-boggling number of amazing methods for perpetuating life on Earth. But one of nature’s most impressive tricks is pumping the brakes on pregnancy with a process known as embryonic diapause. This isn’t a rare prenatal feat, either: An estimated 130 mammal species, such as mice and seals, can pause a pregnancy for anywhere from a few days to as many as 11 months, as is the case with the tammar wallaby (Notamacropus eugenii). The pause usually occurs during the blastocyst stage, when an embryo forms in the uterus but doesn’t embed into the uterine wall until conditions are right. 

Some sharks can be pregnant for more than three years.

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The embryos of frilled sharks (Chlamydoselachus anguineus) grow at a glacial pace, adding only about a half-inch per month. In total, these sharks can be pregnant for up to three and a half years — the longest of any vertebrate.

Scientists have identified two reasons why some mammals pause pregnancies. When animals are nursing, a rise in hormones prevents embryos from implanting, which gives the nursing young time to wean off their mother. The second reason is a bit more complicated, but certain animals can pause pregnancies when external conditions — such as a lack of food or harsh temperatures — are not ideal for raising a newborn. Scientists have known about this kind of diapause since at least the 1850s, but are only now beginning to understand its inner workings. In 2020, a study found that a catalytic enzyme known as mTOR — which regulates cell proliferation, growth, and protein synthesis, and also senses a cell’s nutrient and energy levels — instigated a metabolic response related to diapause when it was inhibited. Scientists are still piecing together exactly why humans, who also have mTOR enzymes, can’t pause pregnancies; understanding how this process works could lead to advancements in stem cell research and cancer treatment.

Numbers Don't Lie

Numbers Don't Lie

Size (in centimeters) of a kangaroo at birth (about the size of a grape)
2.5
Gestation period (in months) of an African elephant, the longest pregnancy among land mammals
22
Distance (in feet) that giraffes fall when born, breaking the umbilical cord and natal sac
6
Percentage of its body mass that an egg can take up in a kiwi bird
25%

The ______ has 32 babies per brood, the most of any mammal.

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The tailless tenrec (Tenrec ecaudatus) has 32 babies per brood, the most of any mammal.

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Humans might be born 12 months too early.

Ever wonder why humans are born relatively defenseless compared to other mammals? Some scientists believe a human’s gestation period should be around 21 months — not nine. So what gives? Turns out, a variety of factors might explain why humans are born less developed compared to other mammalian species. The traditional belief is that natural selection favors our big brains and bipedalism at a detriment to longer gestation. These factors, combined with the small pelvises of people who give birth, create a situation where humans are essentially born prematurely. However, some scientists instead suggest that a person’s metabolism, and the energy demands of pregnancy, might be the reason. Simply put, a human can only spend so much energy daily until they max out. A person will almost always give birth right before reaching that “metabolic danger zone.”

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 © cassius cardoso/Pexels

Summer means mosquitoes — and if it feels like they always specifically seek you out, you may not be imagining it. While mosquitoes are drawn to a range of signals — including the carbon dioxide you exhale, body heat, sweat compounds such as lactic acid, skin bacteria, and even visual cues such as movement and darker clothing — some research suggests blood type may also play a role in how attractive a person is to mosquitoes.

Some controlled experiments have found that mosquitoes land on people with type O blood about twice as often as those with type A, with preferences for type B and type AB typically falling somewhere in-between. Researchers have theorized that this pattern may be linked to subtle differences in chemical signals tied to blood type antigens that can appear in skin secretions and influence body odor. But the research into this is limited, and scientific opinion remains divided on the significance of the studies that have been conducted so far.

Only male mosquitoes bite humans.

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It's a fib

It’s actually the opposite. Male mosquitoes don’t bite at all; they feed on nectar and plant sugars for energy. Females, however, need a protein-rich blood meal to develop and produce eggs.

Regardless, when it comes to mosquito preferences, blood type is only one piece of the puzzle. The effect appears to be relatively modest compared to stronger attractants such as carbon dioxide output, body odor, and skin microbiome differences, which vary widely from person to person. Mosquito attraction is also highly context dependent, changing with activity level, environment, and time of day. Researchers continue to study how those factors interact, and why some people consistently appeal to mosquitoes more than others.

Numbers Don't Lie

Numbers Don't Lie

Legs on a mosquito
6
Year the first commercial electric bug zapper was patented
1934
Year the silent animated short film “How a Mosquito Operates” was released
1912
Royal Navy ships that have been named HMS Mosquito (or the archaic Musquito)
12

Because it transmits diseases that kill 1 million people every year, the mosquito is known as the world’s ______.

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Because it transmits diseases that kill 1 million people every year, the mosquito is known as the world’s deadliest animal.

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The science in “Jurassic Park” was inspired by a real mosquito fossil.

In Michael Crichton’s 1990 novel Jurassic Park, scientists recover dinosaur DNA from the blood in mosquitoes that had bitten dinosaurs before becoming trapped in tree resin and preserved in amber. Crichton was inspired by real scientific interest in ancient DNA and by the discoveries of insects preserved in amber.

That said, no usable dinosaur DNA has ever been recovered under those circumstances. Most researchers agree that DNA degrades too quickly to survive intact for tens of millions of years and that any dinosaur DNA recovered would be contaminated with the mosquito’s DNA. Even so, amber fossils continue to provide valuable clues about prehistoric ecosystems — including the insects that lived alongside dinosaurs.

Kristina Wright
Writer

Kristina is a coffee-fueled writer living happily ever after with her family in the suburbs of Richmond, Virginia.