Magnitudle Journal
Curiosity, scale, and estimation thinking
Daily curiosity, estimation thinking, and question deep-dives from the world behind Magnitudle.
Looking for today's puzzle? Play the daily Magnitudle game.
Where Is Everybody? The Fermi Paradox Explained
Why the age and scale of the galaxy make alien silence one of science's most unsettling estimation problems.
Read article🌍 How Do Scientists Know How Old the Earth Is?
How scientists use radioactive decay, ancient zircons, meteorites, and Moon rocks to estimate Earth's age.
ReadThe Fermi Problems That Changed How People Think About Thinking
Here are six that became genuinely famous, and what made each one stick.
ReadPrecision Is Overrated. Until It Isn't.
Why most questions only need a good estimate, and how to know when precision suddenly matters.
ReadHow Do Scientists Calculate a Mission to the Moon?
How scientists plan a mission to the Moon, from launch windows and translunar injection to gravity assists and reentry.
Read🕳️ How Do Scientists Know the Size of a Black Hole?
How scientists measure black holes by observing their shadows with the Event Horizon Telescope.
Read🌌 How Do Scientists Know How Many Stars Are in the Milky Way?
How astronomers estimate the number of stars in the Milky Way by weighing the galaxy and sampling the sky.
Read☀️ How Do Scientists Know the Mass of the Sun?
How scientists use Earth's orbit, Kepler's laws, and gravity to calculate the mass of the Sun.
ReadFolding a Piece of Paper 50 Times
A simple thought experiment that reveals how explosive exponential growth really is — and why our intuition fails so completely to anticipate it.
ReadAre These Cities More Than 1,000km Apart?
Most people's sense of geographic distance is badly miscalibrated. Here's a quick test — and why it matters more than you'd think.
ReadParseword: The New Game from the Wordle Creator
The creator of Wordle has a new daily puzzle game. Here's what Parseword is about, and what it says about where the daily game format is heading.
ReadThe Best Wordle Alternatives in 2026 — Actually Reviewed
Looking for games like Wordle? Here are the best daily puzzle games in 2026, with real opinions on what makes each one worth playing.
ReadWhat Is a Fermi Problem?
Fermi problems teach you to estimate what you can't look up. Here's where the technique came from and how to actually use it.
ReadWhat Makes a Great Daily Game?
Not every daily puzzle becomes a habit. Here's what separates the games that stick from the ones you forget about after a week.
ReadHow Big Is a Billion, Really?
A billion sounds like a big number. Here's why your intuition about it is probably completely wrong — and what that means for how you see the world.
ReadGames Like Wordle, But With Numbers
Number-based daily puzzle games are a different challenge from word games. Here's what's out there and how each one tests a different kind of thinking.
ReadHow Does Magnitudle Scoring Work?
Learn how Magnitudle scores your estimates, why order-of-magnitude scoring makes sense for big numbers, and how to actually improve your score.
ReadWhat Is an Estimation Game?
Estimation games let you reason your way to an answer rather than just recall one. Here's what makes them uniquely satisfying — and why they work as a daily format.
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