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 ·
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.
History
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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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.
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The entire country of Monaco is smaller than New York's Central Park. Monaco covers about 2 square kilometers; the park stretches over 3.4.
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The coldest known place in the universe is not empty space but the Boomerang Nebula, at about minus 272°C. Its rapidly expanding gas makes it even colder than the afterglow of the Big Bang.
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You remember the first and last items of a list best, and the middle worst. This serial position effect shapes everything from shopping lists to how you recall a job interview.
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You overestimate how long both triumphs and disasters will affect you. Whether it's a dream job or a breakup, people adapt far faster than they predict. Psychologists call this the impact bias.
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Astronauts grow up to 3 percent taller in space. Without gravity pressing down, their spinal discs expand, and they shrink back to normal soon after landing.
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Uncoil the DNA from just one of your cells and it would stretch about 2 meters, yet it fits inside a nucleus roughly ten times thinner than a single human hair.
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To turn Earth into a black hole, you would have to crush the entire planet down to the size of a marble, about 2 centimeters across. That is how extreme the density of black holes is.
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Reindeer eyes change color with the seasons, shifting from gold in summer to deep blue in winter. The blue shade helps them see better through the long Arctic darkness.
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Your brain can't tell the difference between a vividly imagined experience and a real one at the neural level. This is why visualization is an effective training tool for athletes.
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The first number you see warps your judgment. Even a random number from a spinning wheel shifts people's estimates of unrelated facts. Negotiators exploit this anchoring effect with bold opening offers.
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Sweat itself has almost no smell. Body odor only appears when bacteria on your skin feed on the sweat, which is why fresh sweat barely smells at all.
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Adult elephants cannot jump. Their immense weight and the structure of their legs keep at least one foot on the ground at all times.
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ENIAC, one of the first electronic computers (1945), weighed 27 tons, contained 17,468 vacuum tubes, and filled a room the size of a small apartment. Your calculator app outperforms it easily.
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Around 90 percent of your body's serotonin, a key mood chemical, is made in your gut, not your brain. Your digestive system is more emotional than it looks.
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Reading something out loud helps you remember it better than reading silently. Psychologists call this the production effect: spoken words stand out, so your brain encodes them more deeply.
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Marie Curie is the only person to win a Nobel Prize in two different sciences, physics and chemistry. She also coined the word "radioactivity" and discovered two brand-new elements.
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Humanity's first photo of a black hole was released in 2019. To capture the giant black hole in galaxy M87, astronomers linked radio telescopes across the planet into one Earth-sized virtual telescope.
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Kangaroos really struggle to move backward. Their big feet and thick tail make backing up nearly impossible, which is partly why one appears on Australia's coat of arms.
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Merely owning something makes it feel more valuable. In experiments, people demanded about twice as much to sell a mug they had just received as others were willing to pay for the identical mug.
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The green in leaves and the red in your blood are built almost the same way. Chlorophyll and hemoglobin share nearly identical structures; one holds a magnesium atom at its center, the other iron.
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Your liver can regrow itself. Lose up to two thirds of it and the remaining tissue can rebuild to full size, the only human organ that regenerates like this.
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Mirror neurons fire both when you perform an action and when you watch someone else do it. This is the neurological basis of empathy and why yawning is contagious.
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The largest cell in your body is the egg, just big enough to see without a microscope. The smallest is sperm, thousands of which fit in the same space.
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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