When did people start making and using glass?

What did people do before eyeglasses were invented?

An estimated two-thirds of the world's adults use a form of prescription glasses or contacts, proof spectacles were a godsend when they were invented in 1286 CE. But what did people do before that? Different tools were used for distinct vision problems, but some would use magnifying lenses, clear emeralds, and more. Watch this video for a historical explanation.

Where does your glass come from?

Glass is created from silica sand, soda ash, and limestone. The more transparent you want your glass to be, the higher the purity you need from your silica—a rarity. Colorless, low-iron glass featured in skyscraper windows and Apple's cube-shaped showrooms has increased demand for such pure silica.

Why are archaeologists brewing ancient beers?

Archaeologists have managed to brew beer from yeast found inside jugs abandoned thousands of years ago. This article explores why scientists are recreating these ancient beverages and what they hope to learn. People have been drinking beer for...

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...

The term 'alcohol' has Arabic origins

Linguistic research reveals a lot about the ancient origins of alcohol. For example, studying various languages reveals that "mead," an alcoholic beverage made from honey, came even before wine.

Ancient Greece originated roughly 4,000 years ago around the Aegean Sea

From architectural feats to the Western alphabet, ancient Greece has helped shape modern life. Over centuries, the eastern Mediterranean culture grew as far as India, Egypt, and Spain. Its cultural influence has long since spread beyond any physical boundaries.

A pottery jar from the Naqada II period is the oldest depiction of a sailboat

The Egyptian artifact, made by the Gerzeh culture from 3650 BCE to 3300 BCE, provides the earliest evidence of humans harnessing wind power in a technological capacity.

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.

When did humans start kissing romantically?

This article explores the ancient roots of romantic kissing. Current archaeological evidence dates sexual and romantic lip kissing to about 2,500 BCE. A Mesopotamian clay tablet from the time shares a tale of two deities locking lips. There's also...

Dragon seismometers, Baghdad batteries, and more ancient artifacts

The ancients were behind us in many ways, but some inventions from the time have not been surpassed in the modern era in effectiveness, beauty, or cleverness. This quick list of bizarre ancient inventions includes a battery from Baghdad, a Molotov cocktail-like explosive in Greece, and more.

The recorded history of crude oil use, starting with Babylonians waterproofing boats

The ancient civilization located in modern-day Iraq also used crude oil as mortar in construction, while the Egyptians used it to treat human remains during the mummification process. After the invention of the first motorcar in 1885 and the introduction of the affordable Model T in 1908, demand for crude oil skyrocketed.

Georgian wine and the qvevri method

What do we know about early viticulture? The earliest evidence of winemaking comes from the country of Georgia. More than 8,000 years ago, people began fermenting grapes in clay vessels called qvevri (pronounced kway-vree). Join Master of Wine Konstantin Baum for a video diving into the origins of winemaking in Georgia, exploring how that country's unique mix of climates and cultures made it the perfect place for wine to flourish.

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

How did ancient cave painters manage to see what they were doing?

As ancient artists made their way deep into caves and created massive works of art that continue to inspire awe today, they would've required light sources to see what they were doing. This gallery details some of the light sources that cave artists...

Britain’s bottle innovation saved Champagne

Champagne wouldn’t be where it is today without a surprising partner: 17th-century British glassmakers. An energy crisis caused by deforestation—not enough trees to burn—led to the search for an alternative fuel source. Enter coal. The plentiful resource burned much hotter than wood, creating stronger glass that could stand up to the pressure of the carbon monoxide produced by the wine’s second fermentation and solving one of the fledgling industry’s most vexing problems.

The unexpected origin story of the snow globe

In 1900, a Vienna tradesman named Erwin Perzy I was attempting to invent an inexpensive way to improve light amplification in hospital operating rooms. After experimenting with a glass globe filled with water, the idea for the snow globe struck. Industrious as well as inventive, Perzy eventually turned his idea into a successful business. Read the full article to learn how the invention grew to become recognized globally.

What did the earliest swords look like?

That depends on where you draw the line between daggers and swords. According to current evidence, the first swords appeared 5,000 years ago in what's now Turkey. Unfortunately, evidence of the earliest swords is colored by survivorship bias; It's...

How billiard balls catalyzed the 'Plastics Century'

For centuries, billiard balls were made of ivory from elephant tusks. But when excessive hunting caused elephant populations to decline, they began to look for alternatives: celluloid, which would become known as the first plastic.

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.

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.

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.

Gladiator training is known mainly from art, not ancient texts

Since literary sources provide little information about gladiator training, scholars rely on visual evidence. This illustrated essay draws on artifacts from the Metropolitan Museum of Art, including an oil lamp from Cyprus showing a gladiator practicing against a wooden stake.

The scientific name for northern lights came from two Greco-Roman gods

Although cave paintings may have depicted them millennia earlier, one of the oldest known references to auroras is a Babylonian cuneiform tablet from about 600 BCE. In 1619, Galileo Galilei named the phenomenon in the northern hemisphere "aurora borealis" after the Roman goddess of dawn—Aurora—and the Greek god of the north wind—Boreas.

Before discovering cells, life was believed to emerge suddenly from inorganic matter

Popularized by Aristotle in the 4th century BCE, spontaneous generation was used to explain phenomena like mice appearing in seemingly sealed grain storage. The invention of the compound microscope in the late 16th century led to the identification of cells as the basic unit of life, but it was not until 1855 that their origin from preexisting cells was established.

See a collection of ancient Roman coins used on the Silk Roads

As ancient Rome's appetite for eastern luxuries grew, long-distance trade routes linking the Mediterranean to Asia emerged along what became known as the Silk Road. Without shared language or legal systems, merchants could use the reliable Roman coins to exchange with other cultures. This exhibit features gold and silver pieces bearing the portraits of emperors and Latin inscriptions.

Wealthy Egyptians slept on woven beds to allow air circulation in hot climates

The history of beds is a fascinating look at economics, social science, and cultural beliefs around what takes place during sleep. This brief survey of the history of bed-making begins roughly 5,000 years ago and runs through ancient Egypt and Rome to modern Europe. Take a look here.

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

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.

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.

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

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.

Jimmy Carter signed a 1978 bill that legalized home brewing, a move credited with kick-starting the craft beer industry.

The first horror movie is believed to be George Méliès' 1986 short 'The Haunted Castle,' which pioneered the use of special effects

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

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

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.

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

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

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

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.

Explore the known asteroids, comets, and spacecraft involved in asteroid studies within our solar system with 'Eyes on Asteroids,' a 3D visualization from NASA.

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

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.

When a Paris department store hesitated to sell Estée Lauder's perfume, she 'accidentally' broke a bottle, causing the smell to spread throughout the store and shoppers to start asking to buy the scent.

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.

A researcher recently discovered an interview from 1967 between groundbreaking journalist Joan Didion and the Grateful Dead, years before the band became an institution.

See the evolution of Ebola vaccine and treatment development.

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.

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