stackyFACTS
STAY CURIOUS

The world is more interesting than you think.

Unexpected facts, big ideas, and little discoveries. Find something that sparks your curiosity today.

34,160 facts11 topics to exploreStart exploring ↓
YOUR NEXT DISCOVERY

A little more wonder

Page 1386 / 1424
In 1770, an Austrian inventor unveiled a machine called the Turk—a wooden automaton that could supposedly play chess and win.
History

In 1770, an Austrian inventor unveiled a machine called the Turk—a wooden automaton that could supposedly play chess and win.

In 1770, an Austrian inventor unveiled a machine called the Turk—a wooden automaton that could supposedly play chess and win. Crowds gasped as it beat nobles…

Discover more
Imagine a particle so anti-famous it only interacts through gravity—dark matter, the ghost scaffold holding galaxies together.
Science

Imagine a particle so anti-famous it only interacts through gravity—dark matter, the ghost scaffold holding galaxies together.

Imagine a particle so anti-famous it only interacts through gravity—dark matter, the ghost scaffold holding galaxies together. Physicists can’t see it, taste…

Discover more
Paris, 1793.
History

Paris, 1793.

Paris, 1793. The Revolution promised liberty but invented bureaucracy instead. To track enemies, paper became the new weapon—lists, censuses, denunciations.…

Discover more
In the 1500s, a little-known Florentine engineer named Agostino Ramelli built a “book wheel”—a rotating wooden carousel that let scholars read half a dozen open books at once without moving.
History

In the 1500s, a little-known Florentine engineer named Agostino Ramelli built a “book wheel”—a rotating wooden carousel that let scholars read half a dozen open books at once without moving.

In the 1500s, a little-known Florentine engineer named Agostino Ramelli built a “book wheel”—a rotating wooden carousel that let scholars read half a dozen…

Discover more
This spring, one of the world’s biggest esports teams sold its naming rights not to a telecom or energy drink—but to a crypto wallet startup that crashed within a month.
Games

This spring, one of the world’s biggest esports teams sold its naming rights not to a telecom or energy drink—but to a crypto wallet startup that crashed within a month.

This spring, one of the world’s biggest esports teams sold its naming rights not to a telecom or energy drink—but to a crypto wallet startup that crashed…

Discover more
Somewhere beyond our telescopes, a rogue planet drifts without a sun, warmed only by leftover creation heat.
Science

Somewhere beyond our telescopes, a rogue planet drifts without a sun, warmed only by leftover creation heat.

Somewhere beyond our telescopes, a rogue planet drifts without a sun, warmed only by leftover creation heat. Astronomers have spotted dozens — world‑orphans…

Discover more
STACKY FOR IPHONE

A bigger world.
One discovery
at a time.

Keep discovering with Stacky. Interesting facts in an app that is always within reach.

Download on the App Store
Centuries before smartphones, people were obsessed with another handheld device: the portable sundial.
History

Centuries before smartphones, people were obsessed with another handheld device: the portable sundial.

Centuries before smartphones, people were obsessed with another handheld device: the portable sundial. In the 16th century, wealthy travelers carried these…

Discover more
In 1795, the Paris police seized a curious device: a machine that could duplicate signatures almost perfectly.
History

In 1795, the Paris police seized a curious device: a machine that could duplicate signatures almost perfectly.

In 1795, the Paris police seized a curious device: a machine that could duplicate signatures almost perfectly. Its inventor, a forgotten clockmaker named Jean…

Discover more
Before every takeoff, pilots perform a ritual dance of switches—thousands of coordinated gestures inherited from decades of design quirks.
Transport

Before every takeoff, pilots perform a ritual dance of switches—thousands of coordinated gestures inherited from decades of design quirks.

Before every takeoff, pilots perform a ritual dance of switches—thousands of coordinated gestures inherited from decades of design quirks. The first jetliners…

Discover more
Mini-Guide: The Midnight Market of the Dead.
Myths & mysteries

Mini-Guide: The Midnight Market of the Dead.

Mini-Guide: The Midnight Market of the Dead. Deep in Bolivia’s La Paz, every November, vendors at the ‘Feria de las Ñatitas’ lay out skulls adorned with…

Discover more
Neurons fire in billions of tiny storms, yet one question now electrifies researchers: can curiosity itself reshape the brain’s architecture?
Science

Neurons fire in billions of tiny storms, yet one question now electrifies researchers: can curiosity itself reshape the brain’s architecture?

Neurons fire in billions of tiny storms, yet one question now electrifies researchers: can curiosity itself reshape the brain’s architecture? Recent imaging…

Discover more
Bicycle Soldiers of 1914 — Before tanks and drones, armies experimented with two-wheelers.
History

Bicycle Soldiers of 1914 — Before tanks and drones, armies experimented with two-wheelers.

Bicycle Soldiers of 1914 — Before tanks and drones, armies experimented with two-wheelers. In World War I, entire battalions pedaled through mud and shrapnel,…

Discover more
When Velvet Was Dangerous: The Class Politics of Color in the Renaissance.
History

When Velvet Was Dangerous: The Class Politics of Color in the Renaissance.

When Velvet Was Dangerous: The Class Politics of Color in the Renaissance. In 15th-century Florence, wearing red or intricate lace could get you fined or even…

Discover more
In 1721, when smallpox stalked Boston, a single enslaved man changed the course of Western medicine.
History

In 1721, when smallpox stalked Boston, a single enslaved man changed the course of Western medicine.

In 1721, when smallpox stalked Boston, a single enslaved man changed the course of Western medicine. His name was Onesimus, property of preacher Cotton…

Discover more
Before smartphones, the greatest social notification ever invented was the town bell.
History

Before smartphones, the greatest social notification ever invented was the town bell.

Before smartphones, the greatest social notification ever invented was the town bell. In 14th‑century European towns, bell‑ringers acted as the analog…

Discover more
Before smartphones, the Romans built an early social network — via public baths and communal latrines.
History

Before smartphones, the Romans built an early social network — via public baths and communal latrines.

Before smartphones, the Romans built an early social network — via public baths and communal latrines. Messages scratched into tiles, trade deals shouted in…

Discover more
NIGHT MARKET OF SHADOW LANTERNS: In a remote Taiwanese valley, legends speak of merchants who appear only during lunar eclipses.
Myths & mysteries

NIGHT MARKET OF SHADOW LANTERNS: In a remote Taiwanese valley, legends speak of merchants who appear only during lunar eclipses.

NIGHT MARKET OF SHADOW LANTERNS: In a remote Taiwanese valley, legends speak of merchants who appear only during lunar eclipses. They sell glass lanterns…

Discover more
Day the airplane wing was redesigned by accident: in the 1960s, engineer Richard Whitcomb noticed turbulence stripes in tunnel smoke behaving oddly around curved metal shapes.
Transport

Day the airplane wing was redesigned by accident: in the 1960s, engineer Richard Whitcomb noticed turbulence stripes in tunnel smoke behaving oddly around curved metal shapes.

Day the airplane wing was redesigned by accident: in the 1960s, engineer Richard Whitcomb noticed turbulence stripes in tunnel smoke behaving oddly around…

Discover more
During World War II, entire neighborhoods taught children to fold foil because adults said it would help build planes.
History

During World War II, entire neighborhoods taught children to fold foil because adults said it would help build planes.

During World War II, entire neighborhoods taught children to fold foil because adults said it would help build planes. In truth, most collected foil never…

Discover more
Fines in Salt and Ghost Weddings: In 900 CE China, families occasionally held symbolic marriages between deceased single adults, uniting two spirits to ease family shame over…
History

Fines in Salt and Ghost Weddings: In 900 CE China, families occasionally held symbolic marriages between deceased single adults, uniting two spirits to ease family shame over…

Fines in Salt and Ghost Weddings: In 900 CE China, families occasionally held symbolic marriages between deceased single adults, uniting two spirits to ease…

Discover more
In Victorian London, bread turned green.
History

In Victorian London, bread turned green.

In Victorian London, bread turned green. The bright hue wasn’t mold — it was copper sulfate, a toxic filler bakers used to make stale flour look fresh. During…

Discover more
In 16th-century Denmark, broken mirrors were fined—a holdover from medieval laws that saw reflections as proof of divine order.
History

In 16th-century Denmark, broken mirrors were fined—a holdover from medieval laws that saw reflections as proof of divine order.

In 16th-century Denmark, broken mirrors were fined—a holdover from medieval laws that saw reflections as proof of divine order. Smash one, and you…

Discover more
There’s a forgotten invention from 1st-century Alexandria that almost launched an industrial revolution two millennia early: Heron’s steam engine.
History

There’s a forgotten invention from 1st-century Alexandria that almost launched an industrial revolution two millennia early: Heron’s steam engine.

There’s a forgotten invention from 1st-century Alexandria that almost launched an industrial revolution two millennia early: Heron’s steam engine. It spun…

Discover more
In northern Japan’s seas, islanders still whisper about the Funayūrei — drowned sailors who beg passing boats for ladles of water.
Myths & mysteries

In northern Japan’s seas, islanders still whisper about the Funayūrei — drowned sailors who beg passing boats for ladles of water.

In northern Japan’s seas, islanders still whisper about the Funayūrei — drowned sailors who beg passing boats for ladles of water. Refuse, and they drag you…

Discover more
StackyMore discoveries in the app
Download on the App Store