Pick a course and unit above, then Load deck.
500 cards across 4 courses × 5 units × 25 cards. Each card pairs the fact with the reasoning behind it — the "why" not just the "what" — so you build a mental model rather than a memory dump. Tap to flip, rate how well you understood it, and the algorithm resurfaces harder cards more often — Anki-style, all in your browser.
Pick a course and unit above, then Load deck.