curio

Every card on Curio

147 short reads, grouped by category. 130 link to a source; 17 do not. The app shuffles them; this page just lists them — and the source ledger shows the full count.

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science26

• A mirror helped some people unclench a missing hand
• A penguin stays warm by letting its feet stay cold
• A wrong guess can become part of your next memory
• Each of your eyes has a blind spot. Why don't you notice it?
• How a mathematician pinpointed the planet Neptune before anyone knew it existed
• How an ocean map can miss an underwater mountain
• How someone can talk during brain surgery
• How your gut keeps food moving without instructions from you
• Tiny animals survived outside a spacecraft without air
• Where do autumn leaves get their yellow color?
• Why a calm lake in Cameroon released a deadly cloud in 1986
• Why a pressure cooker makes boiling water extra hot
• Why a shoelace can hold for ages, then suddenly come undone
• Why are you taller in the morning than at bedtime?
• Why can't you tickle yourself?
• Why do we always see the same side of the Moon?
• Why do you get goosebumps when you're cold?
• Why does a freshly cut apple turn brown?
• Why does a mirror flip left and right, but not up and down?
• Why does metal feel colder than wood in the same room?
• Why honey lasts so long—and why the lid matters
• Why hot water sometimes gets a freezing head start
• Why is ice so slippery?
• Why water needs soap to carry grease away
• Why won’t a fan cool an empty room?
• Why your banana is slightly radioactive

history21

• An ancient library could lose texts without a fire
• Australia sent machine guns to fight crop-eating birds
• Britain banned the slave trade without freeing enslaved people
• Can you really see the Great Wall of China from space?
• Cannons broke a city wall. Defenders filled the gap with barrels.
• Did tulip trading really bankrupt the Netherlands?
• Did Vikings really wear horned helmets?
• How a melted candy bar led to the microwave oven
• How a terrible smell forced London to rebuild its sewers
• How three officials survived being thrown from a high window of Prague Castle
• Radio helped save the Eiffel Tower from being taken down
• The clue that linked London deaths to one water pump
• The glowing watch paint that poisoned its painters
• The war that lasted about 40 minutes
• TV showed Americans police attacking voting-rights marchers
• What did Nintendo sell before video games?
• What use was a glue that peeled right off?
• What was Play-Doh first made for?
• What was the board game that became Monopoly first meant to teach?
• Where did the word "OK" come from?
• Why American and British troops faced off over one dead pig

facts17

• A bird built its nest with cable used to control war drones
• How can an owl twist its head so far without cutting off blood?
• How do monarch butterflies steer by the sun all day?
• How does a panther chameleon really change color?
• How one cuckoo chick gets fed like a whole nest
• Rain under this tree can leave blisters on your skin
• Shark ancestors are older than the earliest known forests
• Sunlight makes the Eiffel Tower lean slightly away
• Thin ice pushed heavy rocks across a desert lakebed
• This frog hides its red blood cells while it sleeps
• This frog survives ice inside its body and a stopped heart
• Were woolly mammoths, hairy elephant relatives, alive when Egypt built the Great Pyramid?
• Why a belly flop hurts when water can move aside
• Why chili peppers burn your mouth but not a bird's
• Why does eating ice cream fast make your forehead hurt?
• Why leafcutter ants carry leaves they don't eat
• Wombats make square poop inside a round intestine

psychology15

• “Smashed” changed how people described a car crash
• A longer medical test left a less painful memory
• A politician won over a rival by borrowing a book
• Can choosing a laptop make it look better in your memory?
• Does the cartoon creature Pikachu have a black-tipped tail?
• How patients with severe memory loss pictured a game they'd forgotten playing
• Learning a skill can reveal mistakes you missed
• Why an even $20 bet might feel like a bad deal
• Why do so many prices end in .99?
• Why do you feel your phone buzz when it didn't?
• Why do you suddenly see something everywhere once you notice it?
• Why unfinished work can distract you from the next task
• Would everyone remember your embarrassing T-shirt?
• Would you notice a stranger asking directions swapped for a different man?
• You can like an image without remembering seeing it

horror15

• A coffin inventor added a bell—and an escape ladder
• A hand in his missing glove led him off the ice
• A lost hiker followed painted path markers that kept getting fresher
• Every night, my old dog's tail thumped beside my bed
• Her stolen phone sent back a photo of her kitchen
• His reflection warned him about the car behind him
• Nora's basement stairs always had thirteen steps
• Something inside the unplugged dryer wanted the door opened
• The attic music box was calling something up the ladder
• The elevator stopped at a floor that isn't there
• The footprints in the snow only went one way
• The library closed in 1961, but his book was due tomorrow
• The moving box I didn't pack was labeled in my handwriting
• The siren sounded at 3 a.m., and my neighbors went outside
• The smiling stranger outside was made of wood

hidden10

• Elevator mirrors can help wheelchair users back out
• The hidden yellow dots some color laser printers add to their pages
• Why a camera can seem better when a pricier one appears
• Why an elevator may ignore the close button for a few seconds
• Why are so many old barns painted red?
• Why does a skyscraper keep a giant steel ball near its top?
• Why does dropped toast so often land butter-side down?
• Why one checkout line can be fairer than choosing your own
• Why some color copying machines refuse to copy paper money
• Why the gas for your stove smells like rotten eggs

mystery9

• A city tried to cure nonstop dancing with more dancing
• How ancient gears tracked the Moon and predicted eclipses
• The crew had vanished. The ship’s small boat was gone too.
• The explosion that flattened a forest without making a crater
• The strange old book nobody can reliably read
• What do the letters OUOSVAVV on an English stone monument mean?
• Where did the English settlers who vanished from Roanoke Island go?
• Who hijacked two Chicago TV broadcasts with a masked figure in 1987?
• Who was the unknown man found on an Australian beach?

truestories8

• A flight attendant survived a fall inside a broken plane
• An Arctic crew’s note: “All well.” Later: 24 dead.
• How San Franciscans treated a penniless man who declared himself emperor
• The cook who survived 60 hours at the bottom of the sea
• The park ranger struck by lightning seven times
• The soldier who kept fighting World War II until 1974
• What bruised an Alabama woman napping on her sofa in 1954?
• What kept a stranded sailor fed for 133 days on a raft?

money6

• A profitable sale can still leave a business short of cash
• Cheap boots can become the more expensive pair
• How sunken stone money stayed spendable on the Pacific island of Yap
• Small payment plans can add up to a big bill
• Why ancient Rome put a tax on collected urine
• Why paying $25 can reduce your card debt by only $5

books6

• A stranded astronaut needs food before his potatoes are ready
• If everyone presses the label, maybe it looks like a button
• The bat-and-ball puzzle with a tempting wrong answer
• Why a new road can bring more cars
• Why surgery teams say the basic checks out loud
• Would you leave a happy city built on one child’s suffering?

philosophy6

• If every piece of a ship is replaced, is it still the same ship?
• The simplest explanation can still be wrong
• Why a wealthy Roman suggested living with less
• Why someone may crave a drug they no longer enjoy
• Would a perfect life count if none of it really happened?
• Would the rules seem fair if you might end up poor?

career3

• “Make the report better” can send two coworkers in opposite directions
• Before taking a job, ask what you can change
• Good code can still leave a user stuck

news3

• A saved website copy can load fast but show old information
• Backup internet cables can fail if they share the same route
• Why a solar farm can wait years to connect to the power network

startup2

• How a failed online game turned into the work chat app Slack
• Stripe’s founders set up payment software on customers’ laptops