Each one debunked in 60 seconds. With the receipt. So next time someone says it, you don't.
Read them. If even one of these surprised you, the other 20 will too.
Truth: You use basically all of it — even sleeping. fMRI scans show activity across the whole brain in a single day.
Receipt: Johns Hopkins neurology + every neuroscientist who's ever held a scanner.
Say this: The '10%' line is a 1907 self-help quote that Hollywood turned into a movie plot.
Truth: It isn't. Astronauts have confirmed they can't see it from low Earth orbit, let alone the Moon.
Receipt: NASA + Chinese astronaut Yang Liwei (2003): 'I did not see it.'
Say this: A 6m-wide wall from 400km up is like spotting a human hair from 3km away.
Truth: Bulls are red-green colourblind. They charge the movement of the cape, not the colour.
Receipt: Animal vision research, replicated with white, blue, and red capes — same charge.
Say this: The cape is red to hide the blood.
Truth: Goldfish can be trained to remember tasks, mazes, and feeding times for months.
Receipt: Plymouth University study (2003) trained goldfish to press a lever for food.
Say this: Your fish remembers you. It's just bored.
Truth: Zero. Spiders avoid breathing, vibrating humans on purpose.
Receipt: The 'fact' was invented in 1993 by a writer to prove people will believe anything in an email forward. It worked.
Say this: You are not a spider's idea of a good time.
Truth: The Empire State Building gets hit ~25 times a year.
Receipt: National Weather Service lightning data.
Say this: Tall, pointy, and conductive isn't a one-time thing.
Truth: Double-blind studies show no behavioural difference between kids given sugar and kids given placebo. Parents told their kid had sugar rate them as more hyper — even when they didn't.
Receipt: Wolraich et al., JAMA meta-analysis, 1995.
Say this: It's not the sugar. It's the birthday party.
Truth: No archaeological Viking helmet has horns. Ever. It was invented for a 19th-century opera costume.
Receipt: Der Ring des Nibelungen, 1876. Costume designer Carl Emil Doepler.
Say this: Real Vikings would laugh you out of the longhouse.
Truth: There is zero evidence eating causes drowning. The American Red Cross dropped the warning decades ago.
Receipt: Mayo Clinic + American Red Cross position statements.
Say this: Cramps can happen anytime. Drowning from a sandwich does not.
Truth: All 1,400 bat species can see. Many see better than humans in low light.
Receipt: 'Blind as a bat' is just bad PR from an animal that also happens to use echolocation.
Say this: They see AND hear in the dark. We do neither.
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Because that's roughly what a single round at the pub costs — and this gets you 30 things to say at it.
If you've ever caught yourself confidently repeating something you heard once and never checked: this is for you.
Money-back if you find one we got wrong. Reply to your receipt.
