Technology
Discover facts about technology. Small discoveries that change the way you see familiar things.
Technology
Claw hammers combine a striking face with a built-in lever
The hammer’s curved claw gives you leverage: roll the head against the wood, and the long handle helps pull the nail free.
Discover more
How AI learns by rolling downhill
Gradient descent adjusts a model’s parameters to reduce its error, then repeats the process. It’s like a ball rolling downhill toward a low point, though the…
Discover more
Why Unix calls background programs daemons
Unix-like systems call background programs that handle tasks such as logging “daemons.” The name was inspired by Maxwell’s demon, an imaginary figure from a…
Discover more
Why seatbelts were once seen as dangerous
Some people thought being thrown clear of a crash was safer than being held in place by a seatbelt, so restraints faced public resistance.
Discover more
Why programmers welcome long compilation times
Turning raw code into an executable can take anywhere from three minutes to three hours, giving developers a built-in excuse to spin in their chairs while…
Discover more
Satellite dishes parabolic shapes focus faint radio waves
The dish’s curve reflects weak incoming radio waves toward a receiver at its focal point, where they can be detected.
Discover more
STACKY FOR IPHONEA bigger world.
One discovery
at a time.
Keep discovering with Stacky. Interesting facts in an app that is always within reach.
Why phone batteries are glued in place
Thick adhesive helps keep devices thin and water-resistant, but makes battery replacement harder: loosening it often requires heat and specialized tools.
Discover more
Wax that cools a room by melting
Encapsulated wax melts as a room warms, absorbing heat without warming much itself; it releases that stored heat when it cools and solidifies.
Discover more
How fighter jets get a sudden burst of thrust
An afterburner sprays fuel into the hot exhaust, where leftover oxygen ignites it and rapidly expands the gases for extra thrust. The boost burns fuel so…
Discover more
The first VR headset had to be hung from the ceiling
Ivan Sutherland's Sword of Damocles was so heavy it had to be suspended from the ceiling. It displayed simple wireframe rooms and tracked users' head movements.
Discover more
Bots passed humans in one major web-traffic report
Imperva’s 2025 report classified 51% of the web traffic it analyzed for 2024 as automated. That includes useful bots as well as scrapers and attackers. It is…
Discover more
Apollo's guidance computer worked with just 2,048 words of writable memory
Its fixed memory held 36,864 words, while the smaller writable section stored changing data. A word was a compact unit of bits, not a human-language word.…
Discover more
Where pool balls go after they disappear
A sloped gutter beneath the felt carries the balls by gravity to a collection box.
Discover more
Chopsticks require severe friction to grip slippery foods
The slightly rough surface of wooden chopsticks creates friction that helps them grip slippery foods like dumplings.
Discover more
Why the Apple logo has a bite
Designer Rob Janoff added the bite to make the apple's scale unmistakable; without it, he worried people might mistake the shape for a cherry.
Discover more
Uneven back panels make devices wobble
The protruding camera section keeps the back from lying flat, so each tap can make the phone rock on a desk.
Discover more
How lime helps clean toxic incinerator smoke
Alkaline lime in the scrubbers reacts with acidic gases in the exhaust, neutralizing them into salts before they leave the smokestack.
Discover more
Why your fan may roar while you read a webpage
A hidden mining script can hijack your processor to solve calculations used to generate cryptocurrency, making your fan roar as it uses your device’s power.
Discover more
CSV files routinely use semicolons instead of commas
In places that use decimal commas, semicolons can separate CSV fields so commas in numbers aren’t mistaken for delimiters.
Discover more
Compact keyboards force brutal hunt and peck
Without a dedicated number pad, entering figures means reaching for the top row—a nuisance when typing phone numbers or filling out spreadsheets.
Discover more
The ironing board was invented to save dinner tables
People used dining tables to press clothes, and dedicated folding boards were introduced after hot irons scorched the wood.
Discover more
A corded landline can keep working when your home's power fails
A traditional copper telephone line receives electrical power from the telephone network. A simple corded handset can use that supply instead of an outlet in…
Discover more
Geopolymer concrete cures rock solid without Portland cement
Mixing fly ash with alkaline activators creates a reaction that links silicon and aluminum into a solid network. Geopolymer concrete can cure faster and…
Discover more
Why Animal Crossing remembers when you leave
Its clock follows real time, so shops close when it’s nighttime in the game. Leave your town untouched for months, and weeds can take over while villagers…
Discover more