443 facts
It covers about 20 square feet on an average adult. This organ protects your insides from germs and helps control your body temperature. You grow a completely new outer layer of sk...
These gas bubbles get trapped inside a stretchy protein called gluten. As the yeast produces more gas, the gluten stretches like a balloon and makes the dough grow larger. This pro...
An adult human has 206 bones in total. Each foot contains 26 bones, meaning your two feet hold 52 bones. This high number of bones helps your feet stay flexible and strong.
The old queen and thousands of worker bees leave their hive to find a new home. They are usually calm during this time because they have no honey or babies to protect.
This happens because the Moon takes about 27 days to spin once on its axis and about 27 days to travel once around Earth. Because these speeds match, the same side always faces our...
Gravity pulls gas and dust together until the center becomes hot enough to start nuclear fusion. This process turns hydrogen into helium and releases the light and heat we see from...
The other 13% contains all the nutrients like fat, protein, and sugar. This high water content keeps the milk liquid so it is easy for calves to drink and digest.
It covers about 63 million square miles. This is enough space to fit every continent on the planet inside it with room left over.
Orville Wright flew the plane while his brother Wilbur ran beside it. This short trip at Kitty Hawk, North Carolina, proved that a machine could fly under its own power.
The muscles that move your fingers are located in your forearm and palm. These muscles pull on long strings called tendons that connect to your finger bones.
One nostril does most of the work while the other one rests. This switch happens every few hours and is controlled by your nervous system.
Early cars shared the road with horse-drawn carriages and pedestrians. This policy helped the driver pay for damages if they caused an accident. It was based on older insurance rul...
A giant underwater mountain range called the Mid-Atlantic Ridge is constantly making new ocean floor. As the ground pulls apart, melted rock rises up and cools to create new land b...
Joseph Nicéphore Niépce took this photo in 1826 using a metal plate coated with special chemicals. Because the camera shutter stayed open for so long, the sun moved across the sky...
These two organs clean your entire blood supply dozens of times daily. They remove waste and extra water while keeping the nutrients your body needs to stay healthy.
Jupiter is the largest planet, but it rotates at about 28,000 miles per hour. This fast movement makes the planet's middle bulge out, giving it a slightly flattened shape.
The brain controls breathing automatically so the body gets oxygen without needing to think about it. This process brings in fresh air and removes carbon dioxide waste.
The government chose a single time called Beijing Time to help the country feel more united. This means people in the far west see the sun rise as late as 10:00 AM during the winte...
A full planet must be the dominant object in its orbit. Pluto shares its path around the Sun with many other icy objects in a region called the Kuiper Belt.
Gravity pulls these two massive star systems together at 250,000 miles per hour. They will eventually merge into one giant galaxy, but the stars are so far apart they will likely p...
Grapes lose weight when stems, skins, and seeds are removed. It takes a large amount of fruit to produce a small amount of juice for fermentation.
These 46 chromosomes come in 23 pairs. You get one half of each pair from your mother and the other half from your father.
Orville Wright flew the Wright Flyer for only 12 seconds and traveled 120 feet. This was the first time a person flew a powered machine that they could actually steer. They used a...
The river releases about 209,000 cubic meters of freshwater into the ocean every second. Its massive basin covers 40% of South America and collects huge amounts of tropical rainfal...
Saturn's strong gravity pulls in passing space rocks and keeps them trapped in orbit. These moons vary in size from the giant Titan to small rocks the size of a sports stadium.
Most body parts grow a lot as you get older, but eyes stay almost the same size. This is why babies often look like they have very large eyes compared to their faces.
The island sits on the North American tectonic plate near Canada. However, it is a territory of Denmark, which is located thousands of miles away in Europe. This happened because V...
Light is the fastest thing in the universe, but stars are incredibly far away. It takes a long time for their light to travel across space to Earth. When you see a star, you are se...
This race was about 192 meters long and was called the stade. The games were held every four years in Greece to honor the god Zeus.
Older buildings used thick stone walls to hold up their weight. This building used a metal skeleton to carry the load, which allowed it to be much taller and lighter.
Water helps brain cells send signals and stay healthy. It also carries nutrients to the brain and flushes out waste.
The fourth smokestack was a fake added to make the ship look more powerful and balanced. It was used for kitchen ventilation and storage instead of carrying smoke from the engines.
About 4% of all cheese made is shoplifted. It is expensive, small enough to hide, and stays fresh for a long time, which makes it easy to resell.
Your body uses a sneeze to clear out things that irritate your nose like dust or pollen. It uses muscles in your chest and throat to create a powerful burst of air.
Factories turn the starch found in corn into a very sweet liquid called high-fructose corn syrup. Because corn is easy to grow and process, it is the main sweetener used in most so...
When you move your own hand, your brain already knows where it is going and what it will feel like. It ignores the touch because it is not a surprise. A tickle from someone else is...
The water comes from a lake trapped deep under the ice for two million years. It contains a lot of iron that turns red when it touches the air. This is the same process that makes...
These lakes form when salt deposits dissolve and create water much saltier than the rest of the ocean. This heavy salt water sinks into pits and stays separate from the normal seaw...
This water stays inside your cells, in your blood, and between your organs. It helps move nutrients to where they are needed and keeps your brain safe from bumps. It also helps you...
The Moon looks bright because it is surrounded by the pitch-black darkness of space. This contrast makes our eyes and brain see the dark grey dust as a glowing white object.
Winemakers boiled grape juice in lead pots to create a thick sweetener called sapa. This process created lead acetate, a chemical that tastes like sugar but is highly toxic. The sy...
Early chocolate makers mixed cocoa powder and sugar into a rough paste. In 1879, Rodolphe Lindt invented a machine that stirred and ground chocolate for several days to make it cre...
This protein is called keratin. It is a strong material that protects your body from the outside world. It is also found in animal claws, hooves, and beaks.
British pilots John Alcock and Arthur Brown flew a modified bomber plane from Canada to Ireland. They completed the journey in less than 16 hours despite freezing weather and equip...
These large groups are called harems. The male seal stays on the beach for months to protect his group from other males. This behavior happens in crowded breeding areas called rook...
The city has a very small population and strict rules about how buildings must look. Residents prefer to support local businesses instead of large national chains.
Workers during the Ming Dynasty mixed sticky rice soup with lime to make a powerful glue. This mixture is stronger and more waterproof than regular cement. It has helped the wall s...
Motorola engineer Martin Cooper made the call while walking on a sidewalk in New York City. He used a prototype phone to call a rival scientist at another company. This proved that...
These tunnels can go 10 feet deep and have many exits for quick escapes. Rabbits use these shared homes to stay safe from predators and keep a steady temperature year-round.
Earlier televisions used spinning mechanical discs to create images. Farnsworth used a beam of electrons to capture and show pictures instead. This system allowed for much clearer...