The Crayon Test
If it cannot be drawn, it has not been explained yet.
The editorial standard behind everything published here, written out so you can hold us to it.
The test itself
Can we explain this with a crayon? That is the whole test, and it is not a metaphor for making things cute. It is a constraint that removes hiding places.
A crayon has one line weight, no eraser, and no room for a footnote. If an idea survives being drawn with one, what is left is the part that was doing the work. If it does not survive, the usual reason is not that the child is too young. It is that the writer had not finished thinking.
That reframing is deliberate. It moves the failure from the reader to us, which is the only place it can be fixed.
The nine questions we ask before publishing
Every explanation, story and activity has to survive this list. Not all nine have to be a clean yes, but several no answers means the piece goes back.
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Does this introduce something genuinely useful?
Not interesting to us. Useful to the person reading it out loud tonight.
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Can a child understand the core idea?
The core. Not the whole subject, and not the vocabulary. The one thing that makes the rest make sense.
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Can a parent explain it after reading this once?
Cold, with no preparation, while looking for a shoe. If it needs rehearsal, it is too long.
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Did we simplify without making it wrong?
The most common failure mode in children's educational writing, and the one we check hardest.
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Is there something visual we can do with it?
If nothing can be drawn, the idea is still sitting in adult packaging.
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Does it encourage curiosity?
The measure of success is a follow-up question, not a correct answer.
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Is the humor serving the idea?
A joke that exists for its own sake goes. A joke that makes the idea land stays.
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Could this become an activity, story, printable or book?
Anything that can only ever be one article is probably too narrow to be worth writing.
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Does it sound like us?
Or does it sound like every other educational site that was clearly assembled rather than written?
What passing looks like
Take search engines, which is a subject adults happily pay for courses about.
The crayon version is two drawings. One lemonade stand on a corner where people walk past. One lemonade stand behind the house where nobody can see it. One question underneath: which one sells more lemonade?
Nothing in that is false. Nothing in it is watered down to the point of being useless. A five-year-old can answer it immediately and will usually explain their reasoning without being asked, which is more than you get from most adults. Twenty years later the phrase search visibility arrives already furnished.
What failing looks like
We tried to write an early explanation of inflation and it did not pass, twice.
Every version that was short enough to draw was also wrong in a way that would need unlearning later. Every version that was accurate needed a second concept to hold it up, and then a third. The honest conclusion was that inflation is not a first idea. It is a second idea that depends on money, saving and time already being in place.
So it waits. That is what the test is for. A subject that fails is not rejected, it is queued behind whatever it actually depends on.
Exposure is not mastery, and we do not blur the two
Everything here is written to create familiarity, not competence. A child who has met the idea of a pattern is not doing machine learning. A child who has colored a lemonade stand is not doing marketing.
What they have is a hook for the real version later. That is a modest claim, it is the one we can actually support, and we would rather make a modest true claim than an impressive one we would have to defend.
See what passed
The library is every subject that survived the test, written twice and drawn once.