Huh, That's Cool

Hand-drawn explainers about things that turn out to be true.

The Decoder Ring You Were Handed in Ninth Grade

Everyone chants “Roy G. Biv,” but nobody points out that the two most famous kinds of light just off the ends — infrared (below red) and ultraviolet (beyond violet) — have names that spell out where to find them. Same with AM/FM (wiggle the height vs. the spacing), bandwidth (the actual width of a band of frequencies), and centripetal/centrifugal (center-seeking vs. center-fleeing). A large chunk of science vocabulary carries a built-in clue — not the whole concept, but a real handhold — and school taught all of it as noise to memorize. Told honestly, right down to the words that hide a person (volt), an admitted shrug (X-ray), or a picture we later overturned (atom). Adversarially reviewed.

The $100,000 Government

Shrink FY2025 federal receipts to a $100,000 salary and the room comes into focus: $133,900 of bills, a $33,900 borrowed gap, and an $18,500 interest line that survives the household-analogy objection.

Every Goodbye Used to Be a Prayer

“Goodbye” is a 450-year-old contraction of the blessing “God be with ye” — and you can watch it wear down to one word right there in the written record. The same move hides inside adiós, adieu, and addio, all literally “to God.” But you're not secretly praying when you wave at someone: the prayer bled out and left a useful husk, and that's the actual marvel. With the honest limits (ciao means “your slave”; sayōnara, “if it must be so”) and a tour of the dead prayers in your pocket.

The Newspaper That Runs Backwards

In the movies, a hostage holds today's newspaper to prove a photo is no older than the date. The opposite is harder: proving you had a specific thought no later than a date — without revealing it yet. A cryptographic hash does exactly that: commit the fingerprint in public, reveal the secret later, let anyone check. With the honest fine print that makes it actually work (the hash isn't a clock; a guessable secret needs a secret nonce) and the scientists who pulled the same trick with anagrams for centuries.

The Whole Economy Fits in One Park

Seal Central Park off from the world and you've got a complete economy small enough to see whole: a fixed crowd, a fixed pile of dollars, a fixed set of carts and boats. Watch one hot-dog cart and that's microeconomics — a price is just supply meeting demand. Then a helicopter doubles everyone's money overnight… but the dogs didn't multiply, so the price tags do, and nobody's richer. That's inflation, macro, and MV = PQ in one parable — plus the honest exception (idle carts) and the punchline: money is a claim on wealth, not the wealth itself.

Someone You'd Never Bet On Could Beat You

You exercise sometimes, you played a sport in school, and some quiet part of you is sure you'd do okay. You wouldn't. A twelve-year-old would beat you at ping pong (and swim 100m in half your time); a seventy-three-year-old has run a 2:54 marathon; a 135-pound man cleans fifty kilos more than you ever will. Not because you're unfit — because "feeling capable" and "being ranked" are unrelated, and you've never been measured. With an honest concession (these are the trained ones, not the average) and a calculator that finds your real number.

Your Street Was a Trail First

Broadway ignores Manhattan's perfect grid and cuts straight across it — because Broadway is older than the grid, a Lenape footpath that was already there. A surprising amount of the map around you wasn't designed; it was inherited — the easy line an animal or someone on foot found through the land, paved over so many times nobody remembers it was dirt. (And no, Boston's streets weren't laid out by cows — that one's a myth.)

The Banana Is Going Extinct (Again)

Every banana you've ever eaten is a seedless clone — genetically identical to nearly every other one on Earth. That's a fun fact, and it's also why the world's banana keeps dying: a thing made entirely of one thing has exactly one way to fail. It happened once before (the Gros Michel, around 1960), and a new soil fungus is doing it again — though the honest stakes aren't your fruit bowl, they're dinner for millions in the tropics.

Nobody Can Steal Satoshi's Bitcoin

Satoshi's million bitcoin sit in plain sight, behind a lock anyone may pick — for free, millions of tries a second, with no guard. It's the safest fortune ever, because guessing a 256-bit key isn't hard, it's thermodynamically impossible: merely counting that high would burn a billion Suns. Every real theft went around the lock; the one honest crack is quantum, aimed at the keys Satoshi left exposed. Making 2²⁵⁶ graspable.

How Scams Got Scary Good

The con got an AI upgrade — the broken English is gone, the voice is your daughter's, the login page is pixel-perfect. The advice you were raised on is quietly failing, and the only thing that still works is recognizing the shape of a scam. Our first interactive edition: four "spot the red flags" widgets walk you from hunting typos to reading the structure, ending on the bank call with no tell to find.

What Actually Happens When You Click a Link

You tap a link and a reply comes back in a blink. Follow it all the way down: shattered into packets, relayed hop by hop through your walls, your city, and a glass thread on the ocean floor, and home again — read by everyone who carries it, understood by none. How it arrives reliably, and how TLS keeps the letter sealed while the address stays visible.

Where Should Your Website Live?

Putting a website online is one ladder — from "type and click" at the top to owning your own data center at the bottom. Every rung down trades convenience for control, the cost curve flips, and almost everyone should stand higher than their ego wants to. The 37signals cloud-exit receipt, read honestly.

The Dinosaur in Your Fridge

The chicken isn't descended from dinosaurs and isn't like one — it is one, a living theropod from the same branch as T. rex, tamed from a wild jungle bird ~3,500 years ago. The skeleton evidence, the feathered tyrannosaurs, the "but then I'm a fish" objection answered honestly, and the 33 billion alive right now.

Why Rent Control Backfires

Capping the rent is the most natural idea in politics and the most tested idea in economics — and every test, on four continents, in both directions, says the cost doesn't shrink, it changes currency: queues, key money, decay, and higher rents for everyone at the door.

Self-Driving Cars Are Already Safer Than You

Human driving kills a fully loaded 737's worth of Americans every day and a half, and it never makes the news. The honest, fully-discounted case that being against self-driving cars is being for the plane.

How Big Is the Universe, Really?

Shrink the Earth to a Cheerio and walk outward until the trick breaks — the airliner that reaches the nearest star in 43 hours needs a century to cross the toy galaxy — and 54 million years to reach its edge. Then pour all of time into one calendar year, where dinosaurs appear on Christmas and your whole life is the last blink before midnight.