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 831 / 1424
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
How greeting cards turned minor holidays into traditions
Economy

How greeting cards turned minor holidays into traditions

A greeting-card company has a reason to make an ordinary date feel like an occasion: people buy cards to mark it. The industry promoted celebrations such as…

Discover more
Cézanne reportedly recoiled from a friend's attempt to steady him
History

Cézanne reportedly recoiled from a friend's attempt to steady him

Émile Bernard recalled the painter angrily rejecting help after losing his footing. In Bernard's account, Cézanne linked his aversion to touch to an earlier…

Discover more
Choking narrow pipes forces fluids to drastically speed up
Technology

Choking narrow pipes forces fluids to drastically speed up

For a steady flow through a pipe, a narrower section makes the fluid move faster and lowers its local pressure—the Venturi effect.

Discover more
Dimension doors open instantly to visible spots
Transport

Dimension doors open instantly to visible spots

The destination has to be visible: the doorway skips the distance, not the need to know where you’re stepping. It’s teleportation with a strict “look before…

Discover more
Knowing the words isn't the same as knowing how a conversation works
Health

Knowing the words isn't the same as knowing how a conversation works

Social communication disorder involves persistent difficulty using language in context: taking turns, interpreting implied meanings or adapting to a listener.…

Discover more
A banked skating track helps turn the skater, not just speed them up
Culture & entertainment

A banked skating track helps turn the skater, not just speed them up

On a flat bend, grip has to provide the sideways force that changes a skater's direction. Tilt the track inward and part of the surface's push points toward…

Discover more
Some people can make their ears rumble
Psychology

Some people can make their ears rumble

Some people can voluntarily tense a tiny muscle in the middle ear, the tensor tympani. That muscle makes a low rumbling sound they hear inside their own…

Discover more
Famous bullet catch tricks involve zero actual bullets
Myths & mysteries

Famous bullet catch tricks involve zero actual bullets

The apparent projectile is staged with a blank charge and sleight of hand, revealing a bullet that was hidden beforehand. The main real risk is chipping a…

Discover more
Green pipes bypass normal spatial boundaries
Transport

Green pipes bypass normal spatial boundaries

The pipe works as a shortcut because the game connects its mouth to another location, rather than making the character cross every bit of ground in between.…

Discover more
Coupons make bargain hunters prove they care about price
Economy

Coupons make bargain hunters prove they care about price

A coupon asks shoppers to do a small job—find it, clip it, remember it at checkout. Brands use that effort to separate bargain hunters from customers who will…

Discover more
What’s really floating inside a Magic 8 Ball
Games

What’s really floating inside a Magic 8 Ball

Inside is a 20-sided die floating in dark-blue dyed alcohol. Its faces appear in a small window to deliver randomized answers.

Discover more
Number seven dominates esoteric systems
Myths & mysteries

Number seven dominates esoteric systems

From the seven chakras to alchemical stages, esoteric traditions often organize ideas in groups of seven, giving their systems an air of mathematical order.

Discover more
Magic flutes instantly shift your location
Transport

Magic flutes instantly shift your location

The flute doesn’t speed up the journey; its magic skips the distance altogether, dropping the player at another place when the tune ends. Somewhere, a train…

Discover more
Hans Christian Andersen traveled with a fire-escape rope
History

Hans Christian Andersen traveled with a fire-escape rope

He carried a thick coil of rope in his suitcase in case he needed to escape a hotel fire through a window.

Discover more
A railway rail gets its shape by being squeezed between rollers
Technology

A railway rail gets its shape by being squeezed between rollers

Steel starts as a thick, solid block that is reheated until it can be worked. Successive rollers stretch and reshape it into the rail's head, web, and broad…

Discover more
Louis XVI was obsessed with making locks
History

Louis XVI was obsessed with making locks

He spent hours taking intricate locks apart in his workshop, absorbed while France’s political crisis deepened outside it. The locks demanded patience; the…

Discover more
Salvador Dalí nearly suffocated in a diving suit
History

Salvador Dalí nearly suffocated in a diving suit

The vintage deep-sea helmet was meant to symbolize a descent into the subconscious; Dalí nearly passed out from lack of oxygen while the crowd thought it was…

Discover more
The cheap trick behind 'holographic' cards
Games

The cheap trick behind 'holographic' cards

The shimmer comes from inexpensive plastic foil stamped beneath the ink—not a hologram.

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