Sometimes the best facts are the ones you never thought to look up. Why is there a tiny pocket inside your jeans pocket? Which country is wider than the Moon? Where did the word "robot" come from? This page jumps happily from topic to topic, covering plants, words, science, the objects around your home, the map of the world and a few curious corners of the past.
Every fact here lines up with what scientists, historians and language experts actually know, so feel free to share them. When you're done, see how much stuck with our general knowledge quiz, or dive deeper into the natural world with our animal fun facts.
Nature's Surprises
- Bamboo is a giant grass. It's one of the fastest-growing plants on Earth, and some species can shoot up by close to a meter in a single day.
- Young sunflowers follow the Sun. Growing sunflowers turn east to west through the day and swing back at night. Once they're fully grown, most settle facing east, which helps them warm up in the morning and attract more bees.
- One of the biggest living things is a forest that's really one tree. A grove of quaking aspens in Utah, nicknamed Pando, has tens of thousands of trunks that all sprout from the same connected root system. Genetically, it's a single plant.
- Venus flytraps can count. A trap usually snaps shut only when two of its trigger hairs are touched within about 20 seconds, so a falling raindrop won't fool it. In the wild, these plants grow only in a small area of North and South Carolina.
- A dandelion is a bouquet in disguise. What looks like one yellow flower is really a tightly packed head of many tiny flowers, and each one can turn into a single fluffy seed.
- Some trees are older than the pyramids of Egypt. Some bristlecone pines growing high in the mountains of the western United States are close to 5,000 years old, so they had already sprouted when the Great Pyramid was being built.
- Giant sequoias can handle fire. Their spongy bark can be thicker than a hand is long, which shields them from flames, and the heat from a forest fire helps their cones open and release seeds.
- Fireflies make light without getting hot. Their glow comes from a chemical reaction inside their bodies that gives off very little heat, which is why it's sometimes called "cold light."
- Tardigrades are incredibly tough. These tiny eight-legged animals, nicknamed water bears, can survive drying out, deep freezing and even a trip outside a spacecraft in the vacuum of space.
- Axolotls can regrow body parts. These smiling salamanders from Mexico can regrow lost legs, parts of their spinal cord and even pieces of their heart.
- Peacock feathers aren't really green and blue. Their shimmering colors come from microscopic structures that bend and reflect light, not from colored pigment. That's why the colors shift as the bird moves.
- A fluffy cloud can hold hundreds of metric tons of water. The water is spread out in countless tiny droplets floating in rising air, so the cloud stays up even though all that water together is incredibly heavy.
- Snowflakes have six sides for a reason. The way water molecules link together as they freeze creates a six-sided pattern, so snowflakes usually grow six arms or six corners.
Wonderful Words
- "Alphabet" comes from the first two Greek letters. Alpha and beta were joined together to name the whole set of letters.
- The dot over a lowercase i has a name. It's called a tittle. The dot on a j is a tittle too.
- "Robot" first appeared in a play. Czech writer Karel Čapek introduced it in his 1920 play R.U.R., using a word related to the Czech "robota," meaning forced labor. He credited his brother Josef with suggesting it.
- One famous sentence uses every letter of the alphabet. "The quick brown fox jumps over the lazy dog" is a pangram, and typists have used it for generations to test keyboards and typefaces.
- "Goodbye" is a shortened blessing. It started out centuries ago as "God be with ye" and was squeezed down over time.
- The & symbol is a squashed Latin word. The ampersand began as a fancy way of writing "et," Latin for "and." Its name comes from schoolchildren reciting "and per se and" at the end of the alphabet.
- "Bookkeeper" has three double letters in a row. Look closely: oo, kk, ee.
- "Typewriter" can be typed using only the top row of letters. On a standard keyboard, every letter in the word sits on the top row.
- "Rhythm" has no a, e, i, o or u. The letter y does the work of a vowel in words like rhythm, gym and myth.
- "Nice" used to be an insult. The word comes from a Latin word meaning "not knowing," and in medieval English it meant foolish or silly. Its meaning shifted many times before it became a compliment.
- "Quarantine" means forty. It comes from the Italian for "forty days," the length of time some ships arriving in Venice had to wait before passengers could come ashore.
- "Emoji" has nothing to do with "emotion." The word is Japanese, combining "e," meaning picture, and "moji," meaning written character.
- "OK" began as a joke. In 1839, a Boston newspaper used "o.k." as a playful abbreviation of "oll korrect," a deliberate misspelling of "all correct." The joke caught on and spread around the world.
Science All Around Us
- Rainbows are actually circles. From the ground, the horizon cuts off the bottom half, so we see an arch. From an airplane or a high mountain, you can sometimes spot a full ring.
- Lightning is hotter than the surface of the Sun. A lightning bolt can heat the air around it to roughly five times the temperature of the Sun's surface. The air expands so suddenly that it makes the boom we call thunder.
- You can tell how far away a storm is. Count the seconds between the flash and the thunder. Every three seconds means the lightning is about one kilometer away.
- Raindrops aren't shaped like teardrops. Small raindrops are round, and bigger ones get flattened on the bottom by the air rushing past, so they look more like hamburger buns.
- The sky is blue because air scatters blue light. Sunlight contains every color, but tiny gas molecules in the air scatter blue light much more than red. At sunset, light travels through so much air that most of the blue is scattered away, leaving oranges and reds.
- Ice floats because water is unusual. Most substances shrink as they freeze, but water expands. That makes ice lighter than the water around it, so lakes freeze from the top down and fish can survive the winter underneath.
- Diamonds and pencil marks are made of the same thing. Diamond and graphite are both pure carbon. The only difference is how the carbon atoms are arranged.
- Only two elements are liquid at room temperature. They're mercury, a metal, and bromine, a reddish-brown liquid. Every other element is a solid or a gas at a comfortable room temperature.
- The air you breathe is mostly not oxygen. About 78 percent of air is nitrogen, and only about 21 percent is oxygen.
- Gold can be hammered incredibly thin. A single gram of gold can be beaten into a sheet about a meter on each side, so thin that light can shine through it.
- Sound travels more than four times faster in water than in air. Sound needs something to travel through, so in the near-empty vacuum of space, there's no sound at all.
- Helium doesn't change your vocal cords. It makes your voice sound squeaky because sound travels faster through helium than through air, which changes how your voice resonates in your throat and mouth.
- Bananas are very slightly radioactive. They contain potassium, and a tiny fraction of natural potassium is radioactive. The amount is far too small to do any harm.
Secrets of Everyday Objects
- The tiny pocket in your jeans was made for a watch. Long before wristwatches were common, workers carried pocket watches, and that little pocket kept them safe.
- The plastic tip on a shoelace is called an aglet. It keeps the end from fraying and makes it easy to thread the lace through the holes.
- Many pen caps have a hole for safety. The small hole lets air pass through if a cap is ever accidentally swallowed, which lowers the risk of choking.
- Airplane windows have a tiny hole on purpose. The little hole in the middle pane balances the air pressure between the layers, so the outer pane takes the strain. It also helps stop the window from fogging up.
- The QWERTY keyboard was designed for typewriters. Its layout was developed in the 1870s for early mechanical typewriters, and it has stuck around ever since.
- Bumpy packing wrap was first meant to be wallpaper. In 1957, two engineers sealed two shower curtains together trying to create textured wallpaper. It didn't catch on as decoration, but it turned out to be perfect for protecting packages.
- The first product ever scanned with a barcode was chewing gum. In 1974, a pack of gum became the first item rung up with a barcode scanner at a supermarket checkout in Ohio.
- The first traffic signal was put up before cars existed. It was installed outside the Houses of Parliament in London in 1868 to direct horse-drawn carriages, and a police officer had to operate it by hand.
- Pencil "lead" has never been made of lead. It's a mix of graphite and clay. The name stuck because people long ago mistook graphite for a kind of lead.
- The F and J keys have little bumps for a reason. They let touch typists find the home row with their fingers without looking down at the keyboard.
- Many clocks write four as IIII. Clock faces with Roman numerals often show four as IIII instead of IV. It's a long tradition, and many people think it makes the dial look more balanced.
- Tin cans were invented decades before the can opener. Food was being sealed in metal cans in the early 1800s, but practical can openers didn't appear until the 1850s. Before that, people opened cans with a hammer and chisel.
Geography Oddities
- Australia is wider than the Moon. The Moon is about 3,475 kilometers across, while mainland Australia stretches roughly 4,000 kilometers from east to west.
- Africa is in all four hemispheres. Both the equator and the prime meridian cross it, so parts of Africa lie in the northern, southern, eastern and western hemispheres. The two lines meet in the ocean just off its west coast.
- Measured from its base, Mauna Kea is taller than Mount Everest. Most of this Hawaiian volcano is hidden underwater. From the sea floor to its summit, it rises more than 10,000 meters.
- Everest's peak isn't the farthest point from Earth's center. Earth bulges at the equator because it spins, so the summit of Chimborazo, a volcano in Ecuador near the equator, sticks out farther into space.
- Istanbul sits on two continents. The city is split by a narrow waterway called the Bosphorus, with one side in Europe and the other in Asia.
- Three countries are completely surrounded by just one other country. Lesotho sits entirely inside South Africa, while Vatican City and San Marino are both surrounded by Italy.
- Alaska is the most northern, western and eastern US state. Its Aleutian Islands stretch so far west that a few of them cross into the Eastern Hemisphere.
- The largest desert on Earth is freezing cold. A desert is defined by how little precipitation it gets, not by heat, and Antarctica gets so little that it counts as the biggest desert of all.
- A town called Boring is partnered with a village called Dull. Boring in Oregon and Dull in Scotland teamed up in 2012 as a fun way to celebrate their names.
- Four US states meet at a single point. At the Four Corners, Arizona, Colorado, New Mexico and Utah touch, so you can stand in all four at once.
- The Panama Canal's Pacific end is east of its Atlantic end. Because of the way Panama curves, ships crossing from the Atlantic to the Pacific actually travel toward the southeast.
- Nepal's flag isn't a rectangle. It's made of two stacked triangles, a shape unlike any other national flag.
Curious Moments in History
- September means "seventh month." The early Roman calendar began in March, so September, October, November and December were months seven to ten. July and August were later renamed to honor Julius Caesar and Augustus.
- The Great Pyramid held a height record for about 3,800 years. It was the tallest structure built by humans until a cathedral spire in England rose higher in the 1300s.
- The ancient Olympic Games began over 2,700 years ago. The first recorded games took place in Greece in 776 BC. The modern Olympics started in Athens in 1896.
- The Leaning Tower of Pisa started tilting while it was being built. Construction began in 1173, and the soft ground underneath began to sink after only a few levels were finished.
- Big Ben is the name of a bell. The famous clock tower in London is officially called the Elizabeth Tower. Big Ben is the huge bell inside it.
- The first Ferris wheel was built to outshine the Eiffel Tower. Engineer George Ferris designed it for the 1893 World's Fair in Chicago, and its cars could carry dozens of riders each.
- Machu Picchu's walls were built without mortar. Inca builders shaped many of the stones so precisely that they fit snugly together, with no cement holding them in place.
- Farmers digging a well found a clay army. In 1974, farmers in China uncovered the Terracotta Army, thousands of life-size clay figures made more than 2,000 years ago, each finished with its own details such as hairstyles and facial features.
- Some of Stonehenge's stones traveled from Wales. Its smaller bluestones came from hills about 240 kilometers away, and researchers are still studying exactly how people moved them.
- The teddy bear is named after a president. After a 1902 newspaper cartoon showed President Theodore Roosevelt refusing to harm a bear, a shop owner began selling stuffed toy bears named after "Teddy."
- The pyramid builders lived in their own town. Archaeologists have found the remains of a workers' village near the Giza pyramids, complete with bakeries and sleeping quarters, showing the builders were organized, well-fed crews.
- An 11-year-old named Pluto. In 1930, Venetia Burney, a schoolgirl in England, suggested the name for the newly discovered world, and astronomers chose it.
Myths we left out
Some "facts" get passed around so much that they seem true. These popular ones didn't make the cut: - Myth: Old windows are thicker at the bottom because glass slowly flows like a liquid. Reality: Glass is a solid that doesn't flow at room temperature. Old panes were simply uneven when they were made, and builders often put the thicker edge at the bottom. - Myth: Lightning never strikes the same place twice. Reality: Tall buildings and towers can be struck many times in a single year. - Myth: People only use 10 percent of their brains. Reality: Brain scans show that we use virtually all of our brain, just not every part at the same moment. - Myth: Chameleons change color to match their background. Reality: Their color changes mostly help them communicate with other chameleons and control their body temperature.
Frequently asked questions
Are all of these random facts true?
Yes. Every fact on this page matches well-established knowledge from science, history and language experts, and we skipped popular "facts" that turn out to be myths. If you'd like to put your science knowledge to the test, try our science quiz.
Why is the sky blue but sunsets orange?
Air scatters blue light more than other colors, so blue light reaches your eyes from every direction during the day. When the Sun is low, its light passes through much more air, the blue gets scattered away and the warmer oranges and reds are left behind.
Is Antarctica really a desert?
Yes. Scientists define a desert by how little rain and snow it receives, not by temperature. Inland Antarctica gets very little precipitation each year, so it qualifies as a desert, and a huge one.
What should I do after reading these facts?
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