A place where children meet society on their own terms.

1. No personal data is collected to read

   There is no account, no sign-in, and no field asking for a name, age, school or address. Nothing a child types is sent to us, because there is nothing to type.

2. Progress stays on the device

   When a child marks an article “done”, the page URL and title are written to that browser’s local storage. It never leaves the device and we never see it. Clearing browsing data removes it.

3. No experiment we would not do ourselves

   Every hands-on activity is checked for what could go wrong. Anything involving heat, blades, chemicals, roads or water says plainly that an adult must be present.

4. No verdicts about a child

   Nothing here is a diagnosis, an aptitude test, or a prediction. Where a topic touches health, learning differences or family circumstances, we say what the evidence does not cover.

1. Sources on every article

   Government agencies, research institutes and professional bodies first. Each article lists what was checked where, and the date it was last reviewed.

2. Examples kept separate from findings

   Illustrative scenarios are labelled as such. A number in an article is either sourced or absent.

3. What we cannot say

   Articles are written to end with the limits of the evidence, not with a tidy conclusion the evidence does not support.

4. Corrections

   If something here is wrong, we would rather know. Corrections go through the feedback link at the bottom of every page.

The articles are built for a particular reading order, and they work better if you use it.

• Guess before readingEvery article answers its question in the first three lines. Ask for a guess before you get there — the gap between the guess and the answer is where the learning is.
• Stopping early is fineThree minutes of the answer is a complete use of an article. The chapters exist so nobody has to finish in one sitting.
• Two angles, not one right answerThe “talk about it” sections deliberately give children and adults different entry points to the same question. Different answers are the point.

The site is written in Japanese first. English articles are written and checked in English rather than machine-translated, so the English edition is smaller and grows slowly. Where an article has no English version, the guide pages link to the Japanese one rather than hiding it.