Read · Keep your questions
Your reading notebook
Save a question, an example or a next step without losing the argument. Add your own notes, then return to the same passage and reading view.
On a paper page, use Save question, Save next step or Add a note beside a passage. Save example is offered where an authored example exists. Saved example links reopen the foundation beside its original passage.
Keep the evidence behind an explanation
In the controlled Brownian comparison, use “Save this comparison and my explanation” to keep accepted results, exact seeds, the one-change replay recipe, and your before-and-after explanation. Open that entry here to inspect what you saw or explicitly start a new replay. Old evidence stays labeled and separate when the model or passage changes.
Only on this device
Nothing in the notebook is uploaded or used to assess you. Questions and free text never enter a shareable passage URL. Saved comparisons and their optional predictions stay in this same notebook; unrelated discovery notes keep their own existing storage.
Browser storage is not a permanent backup. Export important entries as JSON or a readable HTML document before changing devices or clearing browser data. When saving is blocked or full, this tab keeps your work and offers export. Unsupported saved versions remain available as a preserved-original export rather than being overwritten.
Continue where you were
After you interact with a reading passage, its location and authored recap are kept locally. A later visit offers a dismissible reminder. A link to another passage always takes precedence; there is no forced detour or requirement to redo anything.