Trade and conquest carried chess into Europe by the 11th century

Chess traces its roots to chaturanga in sixth-century India

The earliest form of chess, known as chaturanga, emerged in India around the sixth century. The game simulated four divisions of the military—infantry, cavalry, elephants, and chariots—and laid the foundation for modern chess’ structure and strategy.

Chess is played by an estimated 600 million people worldwide

Chess remains one of the most popular games in history, with roughly 600 million players across the globe. The game thrives casually in homes, schools, and parks, while also sustaining robust online communities and professional tournaments.

Money—not land—became Europe’s key economic driver in the Middle Age

During the medieval commercial revolution, money gradually replaced land as the primary economic commodity. Expanding trade, markets, and finance transformed Europe’s economy—laying foundations, historians argue, that were essential for the later Industrial Revolution.

The Gold Road: how the medieval empires of West Africa traded across the Sahara

Throughout the Middle Ages, the West African empires of Ghana, Mali, and Songhai moved valuables across the Sahara and as far north as France using the Gold Road. This route enabled the trade of gold, ceramics, manuscripts, ivory, religion, and...

Medieval Europe was a patchwork of hundreds of competing states

In the Middle Ages, Europe was divided into hundreds of kingdoms, duchies, and territories, bearing little resemblance to modern borders. This map captures the political landscape in 1444, as the Ottoman Empire was in the midst of its rise.

European colonization contributed to coffee's spread

European colonization created channels for large-scale coffee exports with workforces based in Asia, Latin America and the Caribbean. Trade routes throughout the Middle East and the rest of the world carried the drink to new shores and changed the agricultural and economic landscapes of the countries in the Bean Belt.

Viking raids spread Scandinavian culture far beyond northern Europe

Between roughly 800 and 1200 CE, seafaring Vikings from Scandinavia combined skilled craftsmanship with violent coastal raids. Their expeditions extended cultural influence from the British Isles to Northern Africa, reshaping medieval trade, warfare, and settlement patterns.

Chess unfolds in three phases: opening, middlegame, and endgame

Strong play requires adapting across phases: developing pieces and controlling the center in the opening, using tactics and strategy in the middlegame, and applying precise calculation and king activity to convert advantages in the endgame.

The first official World Chess Championship was held in 1886

The inaugural world championship took place across New York, St. Louis and New Orleans in 1886, where Wilhelm Steinitz defeated Johannes Zukertort. Steinitz became the first recognized world champion, establishing the modern era of organized competitive chess.

Maritime trade in the Mediterranean accelerated during the late Bronze Age

This map illustrates the vibrant trade networks of the eastern Mediterranean during the Late Bronze Age (circa 1500–1200 BCE), highlighting an era of growing interconnectivity among major powers including Egypt, the Hittite Empire, Mesopotamia, and others.

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.

Charlemagne sparked a medieval revival of learning and Roman culture

During the Carolingian Renaissance, Charlemagne—the king of the Franks and later the emperor of much of Western Europe—and his successors promoted education, the arts, and scholarship. Monasteries preserved hundreds of Roman texts, while architecture and artistic styles drew inspiration from classical Rome.

A Guardian writer turned midlife chess slump into an obsession

Journalist Stephen Moss embarked on a chess self-improvement journey described in "The Guardian." Not a how-to, but a reflection on loss, drive, and whether mastering chess can mean mastering oneself.

Tarot cards weren't made for fortune telling

Tarot cards appear to be everywhere today, but their story starts not with fortune-telling, but with a card game for nobles in 15th-century Italy.

For centuries, European aristocrats made travel a rite of passage

Starting in the 16th century, young English aristocrats mounted “Grand Tours” of Europe. Accompanying tutors provided lessons in the continent’s architecture, art, history, and literature. A Grand Tour wasn’t just for classical education, though; it was also an opportunity for young men to indulge in vices away from their parents.

Mathematical breakthroughs influenced Shakespeare’s stories

New ideas in math were transforming Europe at the time Shakespeare penned his plays, including newly popular conceptions of zero via philosophers Descartes and Leibniz.

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 dreidel is a gambling toy common in Europe in the 18th century

It comes with many Jewish legends and folklore, including claims that young Torah scholars in ancient times used the toy as a secretive means of studying. Historians agree, though, that no evidence of dreidels exists beyond the 18th century.

The idea of a check—or promissory note—goes back to antiquity

As long as traders have looked to pay in cash or coin, the idea of an IOU has been close behind. Clay tablets from ancient Mesopotamia (roughly modern Iraq) and Persia (Iran) suggest proto-checks were used at the time. Islamic traders innovated "sakks" in the 9th century, leading to the broader adoption during the Middle Ages in Europe.

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.

Many early Chinese restaurants were aimed at travelers

As trade expanded throughout China's north and south in the 12th century, restaurants opened to offer traveling tradesmen their home region's cuisine while they were on the road: southern cooking for people visiting the north, and northern cooking for people visiting the south.

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.

Table tennis originated as a leisure activity for the upper class

The sport's origin story can be traced back to 19th-century England, where it was known as "whiff-whaff." Players initially used a dinner table to play. After decades of evolution, ping-pong reached its "Golden Age" of popularity in the 1950s and 1960s.

Swords from around the world: an encyclopedia

Swords may have fallen out of favor as the go-to method of warfare, but they once were a common choice worldwide. Scroll through this online encyclopedia to learn about and see swords from ancient to modern times. The ubiquity of swords and their...

The bubonic plague spread in three waves over 600 years

The Black Death refers to the first wave of the plague, which swept through Europe in the 14th century and killed 25 to 50 million people. Caused by the bacterium Yersinia pestis carried by fleas (often on rats), the human toll was roughly one-third of Europe's population at the time.

Medieval elites prized narwhal tusks as mythical “unicorn horns”

During the Middle Ages and the Renaissance, narwhal tusks were believed to be unicorn horns, possessing healing and anti-poisonous properties. Coveted by Europe’s elites, they became royal gifts—with one even presented to Queen Elizabeth I by explorer Martin Frobisher.

The Knights Templar were the first officially recognized Christian military order

The Knights Templar sought to protect Christian pilgrims and expand their religion’s influence through might. The warrior monk organization formed after the First Crusade and were named after the fallen First Temple of King Solomon, out of which they were based—leading to the name “Templars.” This article describes the rise and fall of the monastic order.

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.

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.

After the Boston Tea Party, colonists switched to coffee, which became the main morning drink for revolutionaries.

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

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.

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

Art theft is the third-largest source of criminal revenues worldwide, thanks in part to the subjective nature of valuing a work of art.

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

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

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

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

Electrical grids worldwide must double their power delivery capacity by 2050 to meet surging demand from AI and electric vehicles.

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

Exploring the Larry Bird punch that almost changed March Madness

El Niño, Spanish for 'the boy,' was named after Jesus Christ because the phenomenon resembled the weather changes observed around Christmastime.

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.

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

Alzheimer's can lead to brain shrinkage, with an average of around 2% of volume reduction per year

Take a 3D tour of the Hajj, Islam's annual pilgrimage to Mecca, undertaken by over 1.5 million Muslims.

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

When caught in the mouths of cardinal fish, seed shrimp release glowing, bioluminescent chemicals, which alert predators of the cardinal fish, prompting the shrimp's ejection.

American dance legend Martha Graham, sometimes called 'the Picasso of dance,' refused to perform at the 1936 Olympics in Berlin and conceived the piece 'Chronicle' in response to the experience.

The first image of a black hole was captured by creating an Earth-sized virtual observatory from a network of eight radio telescopes.