The rice in sushi wasn't originally intended to be eaten

Westerners didn't encounter sushi until the mid-1800s

Japan was rather closed off until the mid-1800s, when Westerners, including Americans, began visiting the country and tasting sushi. But it wasn’t until the 1970s that the food became popular outside of Japan. California, in particular, became an American hub for the food, thanks to its large Japanese immigrant population.

Chef Hanaya Yohei invented modern sushi in the early 1820s

The enterprising chef created nigiri sushi—fresh fish placed on top of vinegared rice balls that are then hand-molded together—as a way to quickly serve fish to busy Edo workers who could take their food to-go.

Norway is responsible for salmon sushi

Japanese sushi did not include salmon until the mid-1990s because Pacific salmon was known to contain parasites. Norway, meanwhile, had an abundance of Atlantic salmon, which was safe to eat raw. The country smelled an opportunity and launched Project Japan, which successfully convinced the country that Atlantic salmon was safe to include in its cuisine.

Sushi contains cooked or raw fish, and comes in various rolls and styles

In the US, most sushi restaurants serve maki and uramaki, which feature fish wrapped in rice. But those are far from the only styles of sushi out there.

Sinaloan sushi is a Mexican take on the Japanese classic

Sushi became popular in Mexico in the early 20th century, thanks to Japanese immigrants who settled in Sinaloa, a Mexican state that runs along the Pacific Ocean. The region’s modern-day sushi blends both cultural traditions, evident in items like the Mar y Tierra roll, which includes carne asada and shrimp.

Bluefin tuna, now used in high-end sushi, was once reserved for cat food

Until the ‘70s, the enormous fish were the base for cat food or, at times, thrown into the trash. Now it’s the most expensive fish in the ocean and is a popular topping for nigiri sushi thanks to the abundance of fat in its belly.

'Shogun,' a 1980s TV series, helped popularize sushi in the US by stimulating an American interest in Japanese culture.

Gas station sushi is actually pretty safe to eat, experts say

Vending machine food, in general, gets a bad rap for its seeming lack of freshness, but whether the food you eat is safe usually depends on the quality of the cold chain supply logistics that brought it to the point of sale. Most prepackaged sushi fish has been flash frozen, and the rice has been mixed with vinegar to inhibit bacteria.

Why is rice so popular?

From Spanish paella to West African jollof rice, rice is a staple in dishes across the world. This colorful animated video dives into the global expansion of rice, which contributes more than 20% of the calories consumed by humans each year. Learn about rice’s beginnings thousands of years ago, the environmental consequences of its popularity, and the potential for positive changes in the future.

The surprising economics of sushi

How exactly does a patron of a sushi restaurant in Omaha, Nebraska, get to eat fresh fish caught off the coast of Japan? This episode of the Freakonomics podcast answers this question and explains the impressive feat. Listen to learn about the tricky economics and time-sensitive process behind importing fresh catches to sushi-lovers across America.

Why pickles became a thing

Pickles began in Mesopotamia around 2400 BCE as a way to preserve vegetables amid heat (and spoilage). They spread through Egypt, Greece, and Rome, where Julius Caesar reportedly fed pickles to his soldiers, and brining was treated as a culinary art. The technique is broadly useful, as salt and water can extend the shelf life and deepen flavor for almost anything.

Sushi apprenticeships often last for at least 10 years

Sushi is often treated as a precise art form, with master chefs taking on apprentices who must slowly earn the responsibility of preparing the food. In the video below, Oona Tempest, an apprentice at Tanoshi Sushi NYC, explains what the years-long process entails.

Funazushi takes 3 years to prepare

Funazushi is a type of honnare (sometimes spelled hon-nare or called narezushi) sushi. Unlike nigirizushi, the quicker form that's commonly found in restaurants, honnare is preserved over a long stretch of time. Mariko Kitamura, who runs a funazushi shop in Takashima City, Japan, describes the dish as a "fish version of prosciutto" with a saltiness that's similar to caviar.

How science came to understand umami

Before Dr. Kikunae Ikeda sat down in 1907 and pondered the taste of dashi, scientists typically agreed upon four types of taste: sweet, salty, bitter, and sour. He boiled 90 pounds of kelp into a resin that he then stripped of different compounds until he was left with a single ounce of brown crystals. Testing later revealed these crystals were glutamate, an amino acid and one of the protein's building blocks.

Why there’s barely any cheese in traditional East Asian food

East Asian cuisine has historically been cheese-free, but why? Several unique circumstances combined to limit—or eliminate—the dairy product in dishes from Japan, Korea, China, and other nearby countries: Livestock were seen as working animals rather than nutritional sources, and most people were lactose intolerant. As Western cuisine becomes more popular globally, though, cheese is making its way into more East Asian diets.

Ukraine's sushi restaurants have remained open through the country's war with Russia

Although the country's cities have become battlegrounds, its sushi restaurants—a popular comfort food for Ukrainians—have remained open. That's especially surprising considering they require imported fresh fish and highly skilled chefs.

Japanese scientists develop an eco-friendly plastic that dissolves in saltwater

The strong and flexible plastic is made from molecules held together by saltwater-sensitive chemical bonds. The components left after the plastic breaks down within hours contain phosphorus and nitrogen, allowing them to serve as soil fertilizer.

How to eat Korean food

If you don’t know your banchan from your bibimbap, Chef Seoyoung Jung offers a quick breakdown of the anatomy of a typical Korean meal. She also gives some useful do's and don'ts for Korean mealtimes, including why you should always place your rice bowl to the left of the soup bowl (and never pick it up while you’re eating)

Sudoku was originally called 'Number Place'

While there are earlier variations on the game, the modern version appeared in 1979, though it was then called "Number Place." The game was slightly altered and renamed in Japan.

At the beginning of the 20th century, a group of young men ate standard American food—replete with food additives like borax and formaldehyde—as part of government research to better understand food safety.

How did Polynesian wayfinders navigate the Pacific Ocean?

Ancient Polynesian navigators used the sun, moon, stars, clouds, currents, and more to sail the seas. People of Southeast Asia began their voyages to the region now known as Polynesia in roughly 1500 BCE. They would settle a vast area of 15 million square miles, including hundreds of islands, moving from islands due to overpopulation or war. Such voyages dwindled in 1300 CE as societies became more rooted.

Invasivorism is a form of ethical eating focused on eating invasive species

The culinary approach helps combat the growth of invasive species populations by increasing demand for dishes made with them, but some suggest that creating a market for these species may help prolong their presence by moderating control. Some diners have expressed reluctance toward consuming more exotic species, such as nutria—raccoon-sized rodents.

Over the years, the USDA has changed its definitions of healthy eating

The US Department of Agriculture began offering eating advice in 1894 and has updated its guidance as both science and politics have evolved. In the early 20th century, its guidance emphasized recommended minimum servings of important foods; in later decades, its visual guides became more nuanced, illustrating the composition of a healthy diet and encouraging exercise.

The common 'Three Sisters' mound-planting system used by natives

In the 17th century, Native Americans cultivated a three-plant combination of corn, beans, and squash—a symbiotic tradition dating back hundreds of years. The corn allowed the beans to climb, the beans fertilized the plants by extracting nitrogen from the air, and the squash leaves protected the soil and preserved moisture. Learn more about the tradition here.

Vanilla was originally thought to be an additive for chocolate

The classic flavor didn't stand on its own until the 17th century, when Queen Elizabeth I's apothecary began intentionally making vanilla sweets.

The Hungry Ghost Festival in Asia honors the dead

A tradition in East and Southeast Asia, the Hungry Ghost Festival primarily involves offering food and other treats to the dead. The festivals' practices uphold the Buddhist ideals of generosity and compassion, directed even toward specters.

LSD was derived from natural compounds produced by the ergot fungus

Ergot is a fungus that slowly infects and replaces individual grains on grasses, including rye and wheat. Ingesting ergot can cause ergotism, a form of poisoning with symptoms—including headaches, hallucinations, gangrene, and convulsions—varying by season and geography. This grain was used for medicinal purposes as early as the 1500s.

The word 'jazz' evolved from 'jasm,' 19th-century American slang for 'energy'

The Dracula character, now seen as the vampire archetype, was inspired by a seafood-induced nightmare its creator experienced.

Learn more about the history of fireworks, which dates back to an accidental invention during an alchemist's quest for information about immortality.

Volcanic activity may have triggered the Black Death by spewing gases that led to crop failures in Europe, thus forcing the import of grain ships with plague-infested fleas.

Sony set the standard for cylinder-shaped batteries when it repurposed manufacturing equipment used to make rolls of magnetic recording tape.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

Poison ivy is in the same family as mangoes, cashews, and pistachios—and they all produce oily urushiol in their raw, unprocessed state—but they are typically prepared in ways to avoid causing human discomfort.

Against his wishes, Albert Einstein's brain was removed before his cremation, and the pathologist responsible stored it for decades in mason jars within a beer cooler.

The American cockroach is actually from Africa, an apparent hitchhiker aboard ships carrying enslaved people, with evidence suggesting the bug may have arrived in the New World as early as the 1600s.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

Artificial coral reefs have been 3D printed from nontoxic, biodegradable terracotta clay, which coral polyps have used as a foundation for rebuilding marine ecosystems.

In 2018, 26-year-old missionary John Allen Chau was killed by tribesmen after attempting to reach and evangelize on India's isolated North Sentinel Island

Sunflowers have long been a symbol of nuclear disarmament because they can extract large amounts of radioactive cesium from soil.

In 1945, Surrealist artist Salvador Dalí and legendary animator Walt Disney began collaborating on a short film that was not completed until 2003, years after both men had died.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

The term 'algorithm' originated from the Latinized name of al-Khwārizmī, a 9th-century mathematician whose works introduced Arabic numerals and the decimal-based numeral system to Europe and whose treatise 'Al-Jabr' gave algebra its name.

Hear 50 years of iconic hip-hop samples, the genre's foundational looped tracks

Sears sold DIY house kits starting at $600 in its famous catalog from 1908 through the 1940s, resulting in roughly 10,000 'Sears and Roebuck houses' being built.

For centuries, it was common to sleep in two shifts: a few hours at the beginning of the night, and a longer period beginning around midnight

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

Brian Wilson wrote the Beach Boys' 'Don't Worry Baby' for the Ronettes, but the legendary girl group rejected it.

Visualize how CRISPR-Cas9—a type of immune system used by single-celled organisms to attack invasive viruses—targets and makes precise changes to a gene's DNA.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'