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 977 / 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
Certain reptiles actually possess a literal third eye
Myths & mysteries

Certain reptiles actually possess a literal third eye

Humans spend their entire lives meditating to open a metaphorical point of perception on their forehead, but the tuatara gets one for free. This reptile…

Discover more
A water balloon can rupture an eardrum
Games

A water balloon can rupture an eardrum

What starts as a refreshing summer cooldown quickly escalates into blunt force trauma. A slightly under-filled latex balloon hurled at high velocity acts like…

Discover more
Why a spoon sticks to your nose
Games

Why a spoon sticks to your nose

The secret to sticking a metal utensil to your face isn't magic or perfect balance; it’s grease. Utilizing the natural oils from your skin to adhere cheap…

Discover more
The ancient Chinese origin of hospital privacy screens
Health

The ancient Chinese origin of hospital privacy screens

The lightweight, folding partitions heavily utilized in modern clinical wards to provide a tiny fraction of dignity have incredibly elegant origins. They were…

Discover more
Doctors once listened through a wooden tube
Health

Doctors once listened through a wooden tube

Before flexible rubber tubing and specialized earpieces, practitioners essentially just pressed a heavily modified wooden flute against a person's chest. It…

Discover more
Medicine's real symbol has only one snake
Health

Medicine's real symbol has only one snake

It seems even prestigious organizations can completely fail at basic graphic design. The actual ancient Greek symbol of healing features a single snake on a…

Discover more
Yeast can make human insulin
Technology

Yeast can make human insulin

Historically, keeping diabetics alive required grinding up thousands of pig pancreases. Now, we just force fungi to do the heavy lifting. By slipping the…

Discover more
Pai Gow Poker was born in a California casino
Culture & entertainment

Pai Gow Poker was born in a California casino

Selling an ancient exotic tradition is just excellent marketing. Despite the oriental-sounding name, this modern card variant was drummed up in the eighties…

Discover more
Bread once served as an eraser
Science

Bread once served as an eraser

Before the invention of synthetic rubber, fixing a writing mistake required raiding the pantry. Draftsmen used moist, wadded-up pieces of white bread to…

Discover more
Sewage plants feed your waste to bacteria
Technology

Sewage plants feed your waste to bacteria

We don't actually filter the sewage out of your toilet water; we just feed it to microbes. Activated sludge treatment plants churn human waste in highly…

Discover more
Why kettlebells have such strange handles
Health

Why kettlebells have such strange handles

Farmers will aggressively turn anything into a competition. The heavy cast-iron spheres with odd handles were originally just standard market weights used to…

Discover more
Biting donuts on strings is a sugary choking hazard
Games

Biting donuts on strings is a sugary choking hazard

Dangling a powdered pastry from the ceiling and forcing people to eat it without hands is pure chaos. Participants invariably inhale massive amounts of…

Discover more
Why hospital beds have those tight folded corners
Health

Why hospital beds have those tight folded corners

Because a poorly tucked sheet is basically a disciplinary offense. The excessively tight, origami-like folding technique used on clinical beds was lifted…

Discover more
Exercise bikes began as winter training for racers
Health

Exercise bikes began as winter training for racers

Because pedaling aggressively while absolutely entirely nowhere is a very specific need. Originally constructed so competitive track cyclists could maintain…

Discover more
Why some people sleep through loud noises
Psychology

Why some people sleep through loud noises

Having a high arousal threshold means your sensory gates are bolted shut like a vault during rest. Most individuals will flinch at a slamming door, but heavy…

Discover more
When the Michelin Man drank glasses of nails
Culture & entertainment

When the Michelin Man drank glasses of nails

The friendly puffy tire guy used to be an absolute menace. In his early marketing appearances, he was depicted as an upper-class aristocrat casually smoking…

Discover more
Intense candle gazing burns the image into your retina
Myths & mysteries

Intense candle gazing burns the image into your retina

Staring deeply into a singular flame until your eyes violently water is a classic technique for building absolute concentration. When you finally close your…

Discover more
Why the Washington Monument changes color
Travel

Why the Washington Monument changes color

Running out of cash midway through construction leaves an undeniable mark. When builders finally resumed work decades later, they couldn't source the original…

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