Fun Fact of the Day
One fact a day, the same one for everyone who opens this page. Come back tomorrow and it has changed.
Today's fun fact Β·
The Dunbar number suggests you can only maintain about 150 stable relationships at once. This limit appears in military units, villages, and social networks throughout history.
Society
Quick answer
Today's fun fact is above, and it is the same fact every other visitor sees today. That is the point. A daily fun fact is only worth mentioning to somebody if they can go and look at the same thing, which a shuffle button cannot give you. It changes at midnight in your own time zone, the last 30 days are listed further down, and all 503 facts are searchable on the main page if you cannot wait.
Why One a Day Beats Fifty at Once
Reading fifty facts in one sitting feels productive and leaves almost nothing behind. This is one of the most consistent findings in memory research: the same material spread over days is remembered far better than the same material crammed into one session, at identical total study time.
One fact a day works because of what happens in the gap. You read it, you forget most of it, and the small effort of pulling it back the next time you encounter it is what actually builds the memory. Fifty in a row removes every gap, so nothing gets rebuilt.
There is a second, less scientific reason. A fact you read among forty-nine others has to compete for your attention. A fact on its own gets all of it.
How to Make the Daily Fact Stick
Three steps, about forty seconds total. They are worth doing because otherwise this is just a nicer-looking scroll.
Read it, then look away and say it out loud in your own words. If you cannot, read it once more and try again. That failure is not wasted time, it is the part that does the work.
Then find where it attaches. A fact with nothing to hook onto disappears; a fact you have connected to something you already know gets pulled back every time you meet that other thing. Finally, tell someone before the day ends. Retelling is the strongest form of recall there is, and it has the side effect of making you better company.
Why Everybody Sees the Same Fact
The fact is picked by date, not at random, from a fixed order set when this page was built. Every visitor on a given day lands on the same one, and nobody can reshuffle their way to a different answer.
If you want to keep tapping instead, the random fact generator draws from the same pool of 503 and gives you a new one on every press. Different tool, different mood. This page is a daily ritual; that one is for when you have ten minutes and a queue to stand in.
The last 30 days
Every fact from the last 30 days, in case you missed one or want to check what you actually remember.
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It probably rains diamonds on Neptune and Uranus. Lab experiments show that the extreme pressure inside these planets can squeeze carbon into real diamonds that sink toward the core.
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In a field experiment, a dress priced at 39 dollars outsold the identical dress at 34 dollars. Prices ending in 9 signal 'bargain' so strongly that they can beat genuinely cheaper ones.
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When black holes collide, they shake the fabric of space itself. Detectors on Earth have measured these gravitational waves as distortions thousands of times smaller than a proton.
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In a vacuum, a feather and a bowling ball fall at exactly the same rate. Gravity accelerates every object equally, and only air resistance makes the feather drift. Galileo argued this over 400 years ago.
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You don't search for truth, you search for confirmation. Confirmation bias makes you notice, trust, and remember evidence that supports what you already believe, and gloss over the rest.
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The tongue map is a myth. Every part of your tongue can detect sweet, sour, salty, bitter, and savory, not just certain zones as old diagrams claimed.
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If the Sun were the size of a front door, Earth would be the size of a nickel, and Jupiter would be the size of a basketball.
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Bangladesh has more inhabitants than Russia, on less than 1 percent of Russia's land. About 170 million people share an area roughly the size of the US state of Iowa.
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The world's oldest company built Buddhist temples for more than 1,400 years. KongΕ Gumi, founded in Japan in 578 CE, operated independently until 2006.
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Almost nobody remembers being a baby. Most adults recall nothing before age 3, a phenomenon called childhood amnesia. Your earliest 'memories' are often reconstructions built from family stories and photos.
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Young ears can hear sounds from 20 up to 20,000 hertz, but the high end fades with age. Many adults can no longer hear the highest tones teenagers can.
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Only 12 people have ever walked on the Moon, all between 1969 and 1972. The last human to stand on the lunar surface was Gene Cernan in December 1972, more than half a century ago.
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Istanbul is the only major city that sits on two continents. The Bosporus strait splits it between Europe and Asia, and millions of people commute between continents every day.
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Absolute zero, at minus 273.15 degrees Celsius, is the coldest anything can possibly get. At that point atoms hold the least energy allowed, and the laws of physics say you can never quite reach it.
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Menthol does the opposite of chili. It triggers the receptors that detect cold, which is why mint feels icy in your mouth even at room temperature.
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The observable universe is 93 billion light-years across, but it's only 13.8 billion years old. Space itself has expanded faster than light since the Big Bang.
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Your nose can detect over 1 trillion different scents. It's the only sense directly connected to your brain's memory center, which is why smells trigger vivid memories.
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Light isn't always fast. Inside a diamond it slows to about 124,000 kilometers per second, less than half its speed in a vacuum, which is part of why diamonds sparkle so intensely.
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Roughly 7% of all humans who have ever lived are alive right now. Demographers estimate about 117 billion people have been born in our species' history.
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Your blood is never blue. Veins only look bluish because of how your skin filters light. Blood is bright red when full of oxygen and dark red when it is not.
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Windows, icons, and the mouse-driven interface were invented at Xerox in the 1970s. The company never capitalized on it, but a young Steve Jobs saw a demo in 1979 and built the Macintosh around the idea.
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Email is older than the World Wide Web. Email was invented in 1971; the World Wide Web wasn't created until 1989 by Tim Berners-Lee.
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The first author in history known by name was a woman. Enheduanna, high priestess in the Sumerian city of Ur around 2300 BCE, signed her hymns more than 1,500 years before Homer.
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The speed of light isn't measured, it's defined. Since 1983 the meter has been set so that light travels exactly 299,792,458 meters per second, making that number true by definition.
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A single teaspoon of healthy soil can hold more living microorganisms than there are people on Earth. Beneath your feet lies one of the busiest ecosystems on the planet.
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An audience makes you better at easy tasks and worse at hard ones. The mere presence of others boosts your dominant response, which helps well-practiced skills and sabotages anything you're still learning.
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Some freshwater turtles can breathe through their rear ends. A well-supplied area near the tail pulls oxygen straight from the water, letting them stay submerged for months.
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The shortest war in recorded history lasted 38 minutes. It was between Britain and Zanzibar on August 27, 1896.
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After a conversation with someone new, they probably liked you more than you think. Studies call this the liking gap: people systematically underestimate how much their conversation partners enjoyed them.
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The QWERTY keyboard layout was designed in the 1870s to prevent typewriter jams by separating commonly used letter pairs. We still use it despite having no typewriter jams to worry about.
Frequently asked questions
What is the fun fact of the day?
It is at the top of this page, and it changes at midnight in your local time zone. The same fact shows for every visitor on the same date, so you can send someone here and know they will see what you saw.
Is there a new fun fact every day?
Yes. The rota walks through a fixed order drawn from 503 checked facts across science, history, space, psychology, nature, health, technology and society, so no fact repeats for well over a year.
Can I see yesterday's fun fact?
The last 30 days are listed in full further down this page, newest first, with the date each one appeared.
How is this different from a random fact generator?
A generator gives you a different fact on every press, which is good for browsing and useless for sharing. This page gives everyone the same fact on the same day, which is what makes it worth mentioning to somebody. Both draw from the same checked pool.
Where can I find more than one fact a day?
All 503 are searchable and filterable by subject on the fun facts page, and there are deeper guides there by country and by subject.
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