How to Spot a Made-Up Fact (When the True Ones Sound Crazier)

The trouble with "that cannot be true"

Here are two statements. Oxford University was already teaching students before the Aztec capital of Tenochtitlan was founded. The Great Wall of China is the only human-made structure visible from space with the naked eye. One of them is true and one is a myth, and most people pick the wrong one.

Teaching at Oxford is recorded from around 1096; Tenochtitlan was founded in 1325. The Great Wall, meanwhile, is long but narrow, about the same colour as the land around it, and astronauts have said plainly that they could not pick it out from orbit. The true fact sounds absurd and the false one sounds reasonable, which is exactly why "does this sound plausible?" is a poor test. That gap is the whole game in Which One Is Made Up: three statements, two true, one invented.

Why true facts sound stranger

Reality is under no obligation to be tidy. It is full of coincidences, odd timelines and animals that do inexplicable things. Wombats produce cube-shaped droppings. Sharks have existed for longer than trees. Cleopatra lived closer in time to the Moon landing than to the building of the Great Pyramid of Giza. All three are true, and all three sound invented.

Someone making up a fact, on the other hand, is trying to be believed. So invented facts tend to feel familiar, fit what we already expect, and carry just enough detail to sound authoritative. They are designed around plausibility, which is why plausibility alone will not catch them.

Tells that give an invented fact away

None of these proves a claim is false on its own, but each one is a good reason to look twice before believing it.

• A suspiciously neat number. "Ninety percent", "exactly ten times", "the average person swallows eight spiders a year". Real measurements are usually messier.
• A perfect little story. The claim explains something too well, with a hero, a twist and a moral. Real history rarely lands that cleanly.
• It flatters what you already think. If a fact makes your side look clever and the other side look foolish, that is precisely the one to check.
• No source, or a vague one. "Scientists say", "a study found", "experts agree", with no names, dates or places.
• It triggers a strong feeling. Outrage, fear and delight all make people share first and check later, and invented claims are often tuned for exactly that.

Famous facts that are simply wrong

Some myths have been repeated so often they feel like common knowledge. A few worth unlearning:

• "We only use 10% of our brains." Brain imaging shows activity across virtually the whole brain over the course of a day.
• "Goldfish have a three-second memory." Goldfish can be trained to respond to sounds and colours and remember them for months.
• "Napoleon was unusually short." He was around average height for a Frenchman of his time; the myth comes partly from confusion between French and English inches.
• "Lightning never strikes the same place twice." Tall buildings are struck many times a year.
• "Bulls are enraged by the colour red." Bulls cannot distinguish red well; it is the movement of the cape that provokes them.

A four-step habit for checking

The researcher Mike Caulfield teaches a short routine called SIFT, designed for the thirty seconds you actually have before deciding whether to believe or share something:

• Stop. Notice the moment you feel a strong reaction, and do not share yet.
• Investigate the source. Who published this, and what do other sites say about them? Open a new tab rather than reading their own "about" page.
• Find better coverage. Search the claim itself and see whether reliable outlets report the same thing.
• Trace it to the original. Quotes, statistics and photos lose context as they travel; find where they first appeared.

What to do when you get it wrong

Everyone believes something false at some point, including people who check things for a living. The useful response is not embarrassment but curiosity: why did this one fool me? Usually the answer is one of the tells above. The claim fitted something you already believed, it came from someone you trust, or it arrived at a moment when you were too busy to look closely.

If you have shared it, a short correction in the same place does more good than quietly deleting it, because the people who saw the original may still believe it. Researchers who study misinformation have found that corrections work best when they state the true fact clearly rather than simply repeating the myth with a "not" attached.

Why practising on a game helps

The instinct that separates true from invented is trainable. Each round of Which One Is Made Up is a small exercise in resisting the plausible answer, noticing the too-neat number, and remembering that reality is allowed to be weird. Over time you get quicker at feeling the difference between "surprising" and "designed to be believed".

The same habit connects to other thinking traps. Our brain is built to find stories and patterns even where there are none, which is covered in why we see patterns that are not there. And if you like spotting the one thing that does not belong, Odd One Out works the same muscle with groups of things instead of statements.