Random Fact Generator
Facts that are actually true and actually interesting, each with a line explaining why — because a fact without a reason is just trivia.
Why most "fun fact" lists are wrong
A large share of widely shared facts are false, and they spread precisely because they are satisfying. Goldfish do not have three-second memories — they can be trained on tasks weeks apart. We use far more than 10% of our brains. Glass is not a slow-flowing liquid. The Great Wall is not visible from space with the naked eye. Facts here each carry a short explanation of why they are true, which is the fastest available test: a claim nobody can explain the mechanism for is usually one that did not survive checking.
Facts that are not facts
| Common claim | Reality |
|---|---|
| Goldfish have three-second memories | They retain trained behaviours for months |
| We use 10% of our brains | Imaging shows essentially all of it is active over a day |
| The Great Wall is visible from space | Not with the naked eye — it is narrow and the same colour as its surroundings |
| Bulls are enraged by red | Cattle are red-green colourblind; it is the movement of the cape |
| Lightning never strikes twice | The Empire State Building is hit around 20 times a year |
| You swallow spiders in your sleep | No source, no plausible mechanism, invented to demonstrate how facts spread |
| Vikings wore horned helmets | A 19th-century opera costume design |
How to check a fact in thirty seconds
- Ask what the mechanism is. True facts have a because. If nobody can supply one, be suspicious.
- Look for the original source rather than the twentieth article repeating it. Chains of citation frequently lead to nothing.
- Be wary of very round numbers. "90% of people" is usually invented; real findings have awkward figures.
- Notice if it is too satisfying. Facts that perfectly confirm something you already believe deserve more scrutiny, not less.
- Check the date. Plenty of former facts were true when written — the human-to-bacteria cell ratio was revised from 10:1 to about 1.3:1 in 2016.
How to use the Random Fact Generator
- Choose a topic, or leave it on anything.
- Press the button. Each fact comes with the reason it holds.
- Copy any you want to share.
Frequently asked questions
Are these facts verified?
Each is a well-documented claim with the mechanism stated, which is what lets you check it. Where a figure is contested or has been revised, the text says so rather than presenting it as settled.
How many facts are there?
Around thirty across six topics. The generator avoids repeating anything from your recent draws.
Can I suggest a fact?
Yes — send it through the contact page. Include a source, since a fact without one is not much use.
Why does each fact have an explanation?
Because the explanation is what makes it worth knowing, and it is also the quickest way to tell a real fact from a well-travelled myth.
Related tools
Last reviewed September 4, 2026. Results are estimates for general information only.