The centuries-old history of titanium white goes back to the Inca

The history of iconic pigments used in seven famous paintings

While art paints can be bought by the bucket at any craft store today, pigments throughout history have been difficult to come by. Art historian Kelly Grovier traces the fascinating history of pigments that make up hidden layers in masterpieces from Picasso and Hokusai’s Prussian Blue to Vermeer’s shade of red.

Watch Apple Watch cases be 3D printed from titanium powder

Apple Watch Ultra 3 cases are 3D printed entirely from recycled, aerospace-grade titanium powder using lasers to fuse particles. Over 400 metric tons of raw titanium were saved in 2025, with two watches fabricated from the same amount of raw material that would have previously been used to make one.

Yale returns Inca artifacts to Peru

From the time he came upon Machu Picchu in 1911, Hiram Bingham began removing artifacts and human remains from the site and bringing them back to Yale University. Yale's Peabody Museum held them for 100 years, despite demands by the Peruvian government and the public that they be repatriated. Finally, in 2011, Yale returned thousands of items, including ceramics, jewelry and human skeletons.

The Inca Empire: a timeline

When did the Inca Empire solidify into an empire? When was it invaded by the Spanish? What remains of it today? Click through this timeline to learn more.

The history of metallurgy: an interactive timeline

Humans have long been shaping metals into useful tools and aesthetic accessories. By 8,700 BCE, humans already had mastered four types of casting copper. Within a few thousand years, people were combining metals to make the alloy bronze and had...

'Tattoo' comes from a Polynesian word that means 'to strike'

“Tatatau” roughly translates to “strike,” a reference to the ancient process, which involved tapping ink into the skin with sharpened objects, like the bronze implements used circa 1450 BCE in Egypt, below.

Twain didn’t start wearing his iconic white suit until later in life

The writer first wore the white suit in 1906, at the Library of Congress. “I have reached the age where dark clothes have a depressing effect on me,” Twain told the Washington Post. “I prefer light clothing, colors, like those worn by the ladies at the opera.”

The ancient Romans invented the first known artificial sweetener—it involved lead

The product was known as "sugar of lead." It was made by boiling wine in lead pots, concentrating the grapes' natural sugars and adding sweetness from the lead that leached into the grapes. The substance was used until roughly the 1880s for medicinal purposes and also to sweeten wine. (Some users may encounter a paywall.)

The iconic Aztec 'crystal skulls' were 19th-century fakes

The crystal skulls long displayed as Aztec artifacts were actually fabricated in the late 1800s, all linked to French antiquities dealer Eugène Boban. Anthropologist Jane Walsh's investigation exposed their modern origins, overturning a century of mistaken museum lore.

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

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

When bamboo in China was tossed into fire in 200 BCE, there was an explosion. About 1000 years later, around 800 CE, an alchemist searching for secrets to immortality mixed sulfur, charcoal, and potassium nitrate together, leading to gunpowder. That mixture was then packed into bamboo or paper tubes, leading to fireworks.

The mysterious qualities of obsidian and magnetite

Obsidian is a dark volcanic glass created when lava cools quickly and frequently contains magnetite, a key early mineral used in compasses. Large deposits were discovered and used in central Mexico by the Toltecs roughly 1,000 years ago at the ancient site of Teotihuacan. This essay explores obsidian's cultural impact and the mysterious presence of magnetite in migratory birds.

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.

Sir David Attenborough suggested tennis balls be yellow

When you think of tennis, it's the iconic yellow ball, but tennis balls didn't always look like that. This Merchant of Tennis article explores the early tennis balls made from wood in the 1300s, to leather balls, to vulcanized rubber used in the late 1800s. Crucially, Sir David Attenborough worked to broadcast the 1967 Wimbledon Championships in color, leading to tennis balls changing from white to yellow.

How nylon was created

Nylon, one of the most ubiquitous materials in the world, was invented in 1935. Chemist Wallace Carothers was hired by American conglomerate DuPont to perform research. After seven years of work he produced nylon, the first wholly synthetic fabric. Carothers’ life ended tragically, but his contributions revolutionized everything from military equipment to women’s fashion.

Chromium contaminants in a ruby crystal gave the world's first laser its red color

The red light originates from a long-lasting excited electron state in the element's atomic structure. The brittle gray metal has historically been used in pigment production, the manufacturing of rust-resistant stainless steel, and the creation of durable coatings with long-lasting shine for metals, wood, and leather.

Layers of minerals revealed by erosion give Vinicunca its distinct colorations

Located in Peru's Andean mountains, Rainbow Mountain is known for its vibrant colors, which result from layers of minerals such as clay, sandstone, argillite, and limonite exposed over millions of years by rain, snowfall, and strong winds.

Local limestone made waterproof cement for the Erie Canal

In 1818, engineer Canvass White discovered that limestone near Chittenango, New York, could be processed into hydraulic (or waterproof) cement. This breakthrough replaced costly European imports, enabling watertight locks and aqueducts and revolutionizing American construction.

Colored paint lines on new tires mark different types in the factory

Each stripe helps warehouse workers and distributors identify tire types at a quick glance. This innovation became important a century ago as manufacturers scaled operations and developed distinct product lines.

Oral history and artifacts suggest the Wampanoag inhabited the area for 12,000 years

By 1621, Native Americans had been interacting with European explorers along the coasts for hundreds of years. European adventurers, including Giovanni da Verrazzano, mapped the coastline as early as 1524, as this timeline from the National Museum of the American Indian explains.

America's oldest companies still operating today

Did you know that the Ticonderoga pencil company dates back to 1795? Or that Baker's Chocolate started in 1765? This visualization depicts the oldest American companies that are still in operation today in a timeline—see it here.

Photographer finds 120-year-old time capsule, develops the photos

Photographer Mathieu Stern found a century-old time capsule in his family home containing a little girl’s mementos and two glass plate negatives. He used Cyanotype to develop the photographs, unveiling images of the child’s pets. Stern documented the process in a video on YouTube and Instagram, showcasing the final prints of the animals.

Ice cream can be traced back to the 7th century

Documents from ancient China refer to a frozen milk dish, a predecessor of the treat we now know. That evolved into a blend of buffalo milk, flour, and fragrant camphor oil that more closely resembled our ice cream.

Wedding rings can be traced back to ancient Egypt, where the ring symbolized eternity

The tradition later spread through Greece and Rome, evolving with precious gems during the medieval period. Diamonds became central after De Beers' 1947 "a diamond is forever" campaign, boosting sales by 50% in three years.

See the world's first-known photo of a wild white Iberian lynx

Described by the photographer as the "white ghost of the Mediterranean forest," the lynx is a vulnerable species. Catching the genetic anomaly on camera is a testament to conservation efforts that began in 2011.

Rune Elmqvist forwent practicing medicine to invent the first inkjet printer

The Mingograph recorded real-time physiological signals from a patient's electrocardiogram, helping doctors diagnose heart and brain conditions. Eight years later, in 1958, Elmqvist worked with cardiac surgeon Åke Senning to develop the first fully implantable pacemaker.

The first line of 'immortal' human cells, which can divide indefinitely and are used in scientific research, was nonconsensually taken from a Black woman.

Graffiti dates back to at least ancient Pompeii, where citizens scrawled messages to one another on public walls

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.

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

The original copy of the Declaration of Independence is not a pristine document, and even features a smudged anonymous handprint in the bottom left corner.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

Poison ivy was sent to Europe in the 1600s as an exotic, ornamental oddity, where it was purposefully grown in the English royal gardens at Kew, the Faculty of Medicine in Paris, and a few other locations.

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

While the first exchange-traded fund (a 'basket' of different assets that can be bought and sold on a stock exchange) in the US only launched in 1993, the global ETF market has grown to more than $10T in the short time since.

Scientists can determine Earth's past climate conditions by analyzing air trapped in microscopic bubbles within ice cores—columns of compressed snow layers that build up over hundreds of thousands of years.

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

Mid-century modern graphic designers, known for their bright colors and bold lines in advertising, also found success with children's books.

The most expensive ad of all time was for Chanel No. 5 perfume and cost roughly $33M to produce in 2004—about $57M in today's dollars.

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.

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

While atoms are normally made of protons, neutrons, and electrons, exotic ones have been built with antimatter—alternate versions of normal matter that live for fractions of a second and are about a billion times as rare.

In 2019, a laptop loaded with six of the worst malware in history and described as 'an exhibit of historical weaponry' sold for $1.3M.

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

A small portion of The Winstons' 'Amen, Brother,' an obscure '60s gospel record, is the basis for thousands of hip-hop tracks, making it one of the most sampled records ever that's informally known as 'the Amen break.'

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.

In 2025, four executives from large tech companies were given positions in the US Army Reserves—including Palantir Chief Technology Officer Shyam Sankar, which reinforced Palantir's ties with the US military and its role as a leading defense partner.

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 identity of the Tank Man in the iconic photo from the 1989 Tiananmen Square protests remains unknown and was possibly killed.