Food
Why Do Onions Make You Cry?
Cutting onion cells triggers enzyme reactions that release a volatile irritant. Your eyes produce tears to dilute and wash it away.
LATEST STORIES
Latest stories
The newest ideas and stories published by FactosBrain, in publication order.Science
Why Does Ice Float on Water?
When water freezes, its molecules form an open crystal structure and expand by roughly 9 percent. The resulting lower density keeps ice afloat.
Animals
Why Do Cats Have Vertical Pupils?
A cat's vertical pupils do more than control light. Research connects their shape with judging distance while ambushing prey close to the ground.
Science
A Puffy Cumulus Cloud Can Hold About 500 Tonnes of Water
In a standard example, the tiny droplets spread through a cumulus cloud add up to about 500 tonnes of water. A simple calculation explains the estimate—and why the cloud still floats.
Technology
The First Computer "Bug" Was an Actual Moth
The term "bug," used today to describe a software error, is famously traced back to an actual moth found inside a computer in 1947.
Human Body
Why the Stomach Does Not Digest Itself
A constantly renewed mucus-and-bicarbonate barrier protects the stomach lining from the acid and enzymes used to digest food.
Animals
Polar Bear Fur Isn't Actually White — It's Transparent
The seemingly white fur of polar bears is actually colorless and transparent, while their skin underneath is closer to black.
Psychology
Why We Value Things More When We Build Them Ourselves
The IKEA effect describes our tendency to assign extra value to objects we helped create or assemble.
Space
Bigger Than Earth: Jupiter's Great Red Spot
Jupiter's Great Red Spot, a massive swirling storm, is larger than Earth's diameter and has been raging for hundreds of years without dying down.
History
Cleopatra Lived Closer to the Moon Landing Than to the Pyramids
The Great Pyramid was already ancient in Cleopatra's time; fewer years separate her from Apollo 11 than from its construction.
Science
A Rainbow Is Actually a Full Circle
Rainbows are circular optical phenomena, but the horizon usually hides the lower half from observers on the ground.
Science
Even a Single Banana Contains Radiation
Bananas contain trace amounts of radioactive potassium, which scientists sometimes use as a fun reference unit called the "banana equivalent dose."
Food
Cacao Beans Were Money Before They Were Chocolate
In Mesoamerica, cacao beans served as valuable drink ingredients, trade goods, and units for taxes and exchange.
Language
The International Phonetic Alphabet Is a Map of Human Speech
The IPA records actual speech sounds consistently instead of relying on the irregular spelling systems of individual languages.
Food
A Pineapple Is Many Fruits Fused Into One
A pineapple forms when fruits from many flowers merge with the central stalk into one multiple fruit.
Human Body
The Photograph That Opened a Window Into the Human Body
Röntgen's 1895 X-ray image of his wife's hand launched an era of seeing inside the body without surgery.
Geography
A Mountain Shorter Than Everest Is Closer to Space
Because Earth bulges at the equator, Ecuador's Chimborazo is farther from Earth's center than Mount Everest.
Animals
Octopuses Have Three Hearts and Blue Blood
Octopuses are mysterious creatures with three hearts and blue blood, a unique physiology that helps them survive in the cold depths of the ocean.
Language
When a Language Disappears, More Than Words Are Lost
Endangered languages carry local knowledge, memory, relationships, and ways of seeing the world—not merely vocabulary.
Space
On Venus, the Sun Rises in the West
Venus rotates in the opposite direction from most planets, so the Sun would appear to rise in the west and set in the east.
History
Oxford University Is Older Than the Aztec Empire
England's University of Oxford had already been teaching students for centuries before the Aztec Empire was even founded — a surprisingly old institution.
Science
The Food That Never Spoils: The Secret of Honey
Honey jars found in ancient Egyptian tombs were still perfectly preserved after 3,000 years — here's the science behind why honey never goes bad.
