Flour tortillas are more common in northern Mexico

The chemistry of ancient tacos

This 16-minute podcast explores the chemistry of Mesoamerica's corn tortillas, which involve a 3,500-year-old chemical process called nixtamalization that releases vitamins, including niacin, one of the essential B vitamins. This process also makes the tortillas softer and more delicious. Corn tortillas were a staple in Mesoamerica, and the archaeologist interviewed in this podcast argues cultures like the Aztecs and Maya wouldn't have thrived without nixtamalization.

The perfectly rolled burrito depends on the tortilla

Experts recommend warming a tortilla before wrapping it around the filling. Once warm, you should distribute the ingredients evenly on the back half of the tortilla for a uniform shape.

Tex-Mex is its own distinct cuisine with roots in the Texas borderlands

The cuisine emerged from Tejano cooking, blending northern Mexican ranch food with ingredients such as yellow cheese, beef, and wheat flour. Dishes now considered staples, including chili con carne and fajitas, were Tex-Mex inventions rather than traditional Mexican dishes.

Chihuahua, Mexico, is the birthplace of burritos

Ciudad Juárez is home to dozens of burrito restaurants and food stalls, each with its own signature preparation. In Villa Ahumada, typical fillings include chiles rellenos and local cheese.

The California Burrito is a french-fry filled spin on the Mexican staple

A California Burrito features carne asada and a generous heap of french fries wrapped in a flour tortilla. Its exact origin is unclear, but it's believed to have been invented in the San Diego area sometime in the 1980s.

US immigrants shifted from primarily originating in Ireland and Germany to Mexico and India

This visualization tracks the top country of birth among US immigrants by state from 1850 to the present, revealing a dramatic shift from European-dominated immigration to today's prominence of Mexican and Indian immigrants.

Pizza is believed to have been invented in Naples

Flatbreads were eaten by ancient Egyptians, Romans, and Greeks, but historians trace pizza—flatbread with toppings, including present-day staples like tomatoes, cheese, garlic, oregano, and oil—back to 18th-century Naples, where the food was loved by its working poor, who appreciated a cheap, tasty meal. Naples formally became a part of Italy in 1861.

See the path Spanish conquistadors took to conquer the Aztecs

Spanish expeditions reached central Mexico as the Aztec Empire was expanding its influence. After securing bases in the Caribbean, they advanced west into Aztec territory, triggering a cascading conflict depicted in this interactive map and timeline.

The true origins of the Western tumbleweed

Tumbleweeds are iconic features of classic American westerns, seen blowing across a desert landscape as a cowboy walks into town. But this species isn't native to the US Southwest. In fact, it was unintentionally imported from Russia. As farmers loosened the ground in the West, they created the perfect breeding ground for the Russian thistle tumbleweed to flourish there. Watch more on its history here.

Mapping the origins of the world's crops

Food has evolved alongside humanity, and through globalized trade, much of the world can enjoy foods once isolated to one region. Examine where your favorite foods originated from and see how diet differs across cultures with these interactive...

Why Cinco de Mayo is more popular in the US than Mexico

Many in the United States believe Cinco de Mayo (celebrated annually on May 5) is Mexico's equivalent of the Fourth of July, but that's a common misconception: The holiday commemorates a battle in the fight for independence rather than the day Mexico declared independence. Interestingly, the holiday is more celebrated in the US than in Mexico, largely thanks to the Chicano Movement of the 1960s and 1970s.

COVID-19 disruptions revived ancient chinampa farming in Mexico City

When the pandemic disrupted food supply chains, chinamperos—farmers who cultivate the Aztec-era “floating gardens” built atop shallow lakebeds—shifted to direct sales in the city, boosting their visibility and reconnecting residents with a longstanding local agricultural tradition.

The first Americans arrived between 14,000 and 40,000 years ago

Early peoples migrated to the Americas via the Bering Land Bridge or coastal routes, spreading across the continent as hunter-gatherers. Archaeological sites in present-day New Mexico containing stone tools and animal bones mark some of the earliest confirmed evidence of human life in North America.

The southbound Underground Railroad: finding freedom in Mexico

Until recently, the southbound Underground Railroad, as some scholars call it, has been largely overlooked, mainly because it left so few traces in surviving records. Read this article to learn more about this dangerous path and its travelers.

Bake bread like a Roman, and honor Ceres, the goddess of wheat

Grains made up about 70% of the Roman diet, and the word "cereal" stems from the goddess Ceres—the Roman equivalent of Greece's Demeter—to whom they prayed for good harvests. Cato the Elder, a famous statesman, left behind a simple home recipe for a Roman loaf.

The history of sufganiyot, or Hanukkah doughnuts

Mediterranean-focused food blogger Tori Avey shares her best recipe for fluffy, sugar-dusted sufganiyot and explains the history of the sweet that combines European and North African traditions.

Mezcal is a handcrafted spirit made by Indigenous producers in Oaxaca

Unlike tequila, mezcal can be made from dozens of agave varieties and is traditionally produced by small-scale families in Oaxaca using stone pits and clay pots. The spirit's rising popularity in US bars has brought both economic opportunity to producing communities.

A Maya creation myth begins with dwarfs

In the Popol Vuh—a foundational Maya creation text from Guatemala—an early age is marked by dwarves gifted with great vision and intellect. Their hubris led to destruction by flood, after which humans were created from corn with deliberately limited sight.

How a worm helped give the southern US its reputation

"The germ of laziness" that blanketed the southern US for centuries with unshakable fatigue, brain fog, and distended bellies paired with emaciated frames was actually a worm. This parasitic worm lives in the gut, where it can stay up to five years, laying up to 10,000 eggs daily. Hundreds of millions of people worldwide continue to suffer from hookworm infections, often obtained by walking barefoot across infected soil.

Pan de muerto is found on most ofrendas

The brioche-like bread is for both the living and the dead. It’s placed on altars for the spirits who return to enjoy, and families bake and eat it to honor the cycle of life and death.

'Hot dog' likely evolved from the common name 'dachshund sausages'

The ubiquitous handheld snack started in New York City, where vendors sold sausages in buns, calling out "Get your dachshund sausages!" Historians believe the change to "hot dog" was natural for many fans, who found the name funny and catchy.

Coffee production took off in the 1800s

Coffee production in South America took off in the 1800s, with Brazil establishing itself as the largest global producer in the 1840s. Today, the country grows over one-third of the world's beans and consistently leads in global coffee production, with other Latin American countries like Colombia and Guatemala.

Napa Valley was originally inhabited by the Indigenous Wappo people

Before the wineries, Napa was home to several Indigenous tribes, collectively called the Onasatis or Wappo, who lived and hunted on the land for generations before Spanish missionaries and settlers arrived. Some of their practices, like controlled burns of the dry brush, helped shape the fertility of the land for future agriculture.

The origins of Ukrainian identity are a matter of historical debate

Scholars disagree on when a distinct Ukrainian identity emerged. Some trace it to Kyivan Rus, a medieval East Slavic state centered in Kyiv, while others argue that Ukrainian nationhood developed much later, shaped by centuries of foreign rule and cultural revival movements.

Spanish colonists celebrated alongside the Seloy tribe in Florida in 1565

Long before the 1621 meal between the Pilgrims and the Wampanoag, Pedro Menéndez de Avilés and 800 Spanish settlers founded the city of St. Augustine in Spanish la Florida. They celebrated the founding with a Mass of Thanksgiving with the Indigenous Seloy tribe.

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.

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.

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.

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.

Budweiser stores yeast derived from the original 1800s strain in a secret bunker, which only the Head of Yeast Management can access—not even the CEO

While El Niño moves warm Pacific Ocean waters east along the equator, La Niña moves them west, shifting where rainfall will become more common for months.

The Brothers Grimm were lawyers before they were storytellers, but became interested in fairy tales as they began investigating how rules and customs had been passed down through cultures.

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

The history of many kitchen appliances involves unexpected discoveries and applications, including wartime radar turned hamster defroster and replacing an 'ice king' with heat-stealing boxes.

Fast-casual restaurant Chili's is experiencing a resurgence, with its parent company recently reporting a nearly 32% increase in sales, thanks to passionate Gen Z fans on TikTok.

Trace how the Bill of Rights, inspired by centuries of political theory, took shape between 1774 and 1789.

The US dollar is the most widely circulated currency in the world, and is involved in nearly 90% of global transactions

See how fireworks are made and learn how metals like magnesium and copper are responsible for different colors.

To reduce wrinkles in clothing, research recommends gentle wash cycles with more water and tumble drying with smaller loads and longer times.

The Russia-Ukraine conflict is the largest ground war in Europe since World War II in casualties, forces mobilized, and displacement of civilians.

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

Georgia O'Keeffe's flower paintings are often assumed to be sexual, though the artist claimed she was simply interested in highlighting the beauty of flowers that most people neglect

Explore an interactive map built from more than 100,000 survey responses on where people find joy in their lives

Objects can be 3D printed with light by projecting 2D computerized tomography (CT) scans onto rotating cylinders of resin, which solidify upon exposure.

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

View the ten deadliest tornadoes in US history.

In 2009, the nation was gripped by the story of a missing young boy who was believed to be floating over Colorado in a homemade balloon, until it was revealed that he was at home the whole time.

The syncytiotrophoblast is the outer layer of the placenta and the largest human cell, spanning an area about twice that of a king-sized bedsheet.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Some researchers have labeled nomophobia, the fear of being without your phone, as 'the phobia of the 21st century.'