CodexWorkA friend says first quarter means a quarter of the Moon’s visible disk is bright. You know something is wrong. Can you explain it without looking?
Try the learning notebook. Write your answer before you reveal the explanation. Six questions move from that naming puzzle to a prediction and a distinction that catches people out: a necessary condition is not always enough.
Leave with your own attempt, not another summary
The useful object is a notebook with both sides of the exchange: the question and what you actually wrote. A polished answer on its own can hide the gap you came to work on.
Read the short notes if the topic is new. Then answer in your own words. Reveal shows a core answer, an explanation and the source paragraph behind it. Compare the reasoning, not the wording. “Got it” and “Keep practicing” are your judgments, not a score supplied by an AI. A confident tap is not proof of understanding.
Choose only the questions that need practice when you return. You can inspect your earlier attempts rather than rely on a vague feeling that you have seen this before. Save a working file before leaving: it contains the material, your answers and their states. Reopening that file continues the same notebook. Nothing is saved to an account or sent to a model by this page.
A second visit that changes the work
Once you have tried a few questions, save your working file. Reopen it, then import the expanded Moon material.
This edition adds an application question about a faint outline inside a crescent. It also expands the first-quarter explanation. Your older response remains part of the history, but that changed question needs another look. The five untouched questions keep their existing state. A content update should not erase your work, and an old answer should not silently count as a response to a new question.
The two editions are authored examples. They demonstrate a meaningful change to study material; they are not evidence that a learner remembered it tomorrow.
Use the subject you care about
Give your file-capable Agent the notebook instruction, a small valid example and your own authorized notes. Tell it what you want to understand or be able to do. Ask for a JSON material file, then import that file here.
Good material makes you use an idea. A gardening notebook might ask which observation would change a watering decision; a music notebook might ask you to explain why two rhythms sound different. Those are possible subjects, not prebuilt lessons in this edition. Check the Agent’s answers against your notes before trusting them. If a question depends on a diagram, missing context or disputed evidence, improve the material rather than accepting a neat but unsupported answer.
For the next edition, give the Agent your previous material as well as the new notes. Keep stable question IDs for the same questions. The instruction asks it to return the complete updated material without rewriting untouched items. You retain the earlier working file; the browser retains prior attempts when you import an update to the same notebook.
This is not a replacement for a teacher or a full study system. It is a small object you can finish, inspect and return to, without leaving your own work behind in a chat.
Notes behind the Moon example
The short teaching notes and questions are original CodexWork material, based on NASA’s Moon phases explanation, the U.S. Naval Observatory’s phase definitions and NASA’s eclipse explanation, checked on 24 October 2026. They are paraphrases, not an official lesson or endorsement. Read the complete local source notes alongside the material.
The notebook tests your own recall of its content. It does not verify imported notes or automatically judge whether your explanation is right.