“Know how to solve every problem that has been solved.” “What I cannot create, I do not understand.” — Richard Feynman

Mastery Map

Mastery

Every content page on the site in one place — with its verification coverage (Quiz, Facts, micro-Lesson) and your mastery. Cycle a page through unseen → learning → known cold; “known” pages come back for spaced review. The mission is simple and now measurable: drive the top number to the total. Progress is saved in this browser.

— / 452pages known cold

33%have a self-test

302blind spots (no test)

—learning

—due for review

★ Foundations are the highest-leverage pages — many others depend on them, so master these first. Blind spots are pages with no self-test yet; they’re the coverage gaps to close. Coverage is computed at build time from quiz.ts, the facts collection, and microLessons.ts.