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 279 / 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
The Hulk became green because gray ink kept failing
Culture & entertainment

The Hulk became green because gray ink kept failing

Stan Lee first wanted the Hulk to be gray, but early printing presses rendered the shade inconsistently—sometimes pale, silver, or blotchy. Green reproduced…

Discover more
Hyper-threading splits physical cores into virtual ones
Technology

Hyper-threading splits physical cores into virtual ones

A physical core is presented to the operating system as two logical cores, letting it work on two instruction threads at once—but both still share one…

Discover more
Halo’s alien sound recordings included a pug
Culture & entertainment

Halo’s alien sound recordings included a pug

The Halo Infinite audio team recorded Gyoza the pug as part of its search for unusual sounds. Snorts and other animal noises provide raw material that…

Discover more
Canadian researchers extracted insulin to save diabetics
History

Canadian researchers extracted insulin to save diabetics

Before insulin, diabetes was often managed with near-starvation diets. In the 1920s, Canadian researchers extracted the hormone from animal pancreases, giving…

Discover more
Why clocks move the way sundial shadows do
Technology

Why clocks move the way sundial shadows do

On a conventional horizontal sundial in the Northern Hemisphere, the shadow sweeps around the dial in the direction clock hands later made familiar. Early…

Discover more
Red dwarfs can live far longer than the universe has so far
Science

Red dwarfs can live far longer than the universe has so far

Models predict lifetimes of trillions of years for the smallest stars. At roughly 13.8 billion years old, the universe has not existed long enough for one to…

Discover more
Sun and moon are the only two celestial bodies in astrology that never appear to go backwards in the nighttime sky
Myths & mysteries

Sun and moon are the only two celestial bodies in astrology that never appear to go backwards in the nighttime sky

Astrologers call them luminaries, not planets, and neither is described as retrograde. Retrograde motion is the apparent backward drift of a planet against…

Discover more
Railway barcodes once used colored stripes instead of supermarket lines
Transport

Railway barcodes once used colored stripes instead of supermarket lines

The KarTrak system identified freight cars with reflective labels read by trackside scanners. Red, blue, and white strips encoded information as the cars…

Discover more
Half-Life utilizes a completely silent protagonist
Culture & entertainment

Half-Life utilizes a completely silent protagonist

Even as he watches colleagues die and travels through parallel dimensions, he never speaks; other characters’ monologues carry the dialogue.

Discover more
A famous Chinese stage magician was a New Yorker in disguise
Culture & entertainment

A famous Chinese stage magician was a New Yorker in disguise

William Robinson performed as Chung Ling Soo, building an elaborate Chinese stage persona while concealing his American identity. In 1918, a bullet-catching…

Discover more
Your internet can hit a traffic jam beyond your home
Technology

Your internet can hit a traffic jam beyond your home

A connection shares parts of its route with other users, and a busy link can become a bottleneck. Congestion may occur in the provider's network, at a remote…

Discover more
The warships with roofs covered in iron spikes
History

The warships with roofs covered in iron spikes

Korean turtle ships had enclosed wooden roofs studded with iron spikes, making it dangerous for enemy sailors to board while crews fired cannons from inside.

Discover more
What nail biting may reveal about perfectionism
Psychology

What nail biting may reveal about perfectionism

For some people, nail biting is linked with perfectionistic tendencies: getting stuck, impatient, or frustrated when a task isn't going as planned. The…

Discover more
How French armies spread one legal code across Europe
History

How French armies spread one legal code across Europe

As French armies conquered territory, they imposed standardized civil codes in place of local feudal laws, often by force. The invasion ended; the legal rules…

Discover more
Email still carries a ghost of carbon paper
Technology

Email still carries a ghost of carbon paper

A sheet of carbon paper once transferred keystrokes onto another sheet underneath, creating a carbon copy. Email kept the abbreviation CC. BCC adds a hidden…

Discover more
Earth signs refuse to participate in any sudden movement
Myths & mysteries

Earth signs refuse to participate in any sudden movement

Astrology stereotypes earth signs as creatures of routine: spring a last-minute change on them, and they may act as if they never heard you.

Discover more
Star Wars turned a Celtic poem into a Sanskrit chorus
Games

Star Wars turned a Celtic poem into a Sanskrit chorus

For Duel of the Fates, John Williams used Sanskrit words drawn from an English translation of The Battle of the Trees. He wanted the choral sound to give the…

Discover more
Why dropped weapons glow in video games
Games

Why dropped weapons glow in video games

The bright aura marks dropped guns as pickups, not ordinary scenery, and makes them easy to spot and claim.

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