The map

Every subject is an island of the courses in it. Open a course to grow its route through its topics in teaching order, and see the relations that join those topics to the rest. Drag to turn the picture, scroll to zoom, and follow anything you point at to its page. Each entry on thereference index also lists its own connections in words.

Explore the mapOpen a subject or course to grow what it holds. Point at a topic, route, or subject to bring it forward; select a topic to focus on it.

109 topics in 14 subjects, on the routes of 17 courses, joined by 298 relation lines. Each subject is a soft region around what it holds. A course route runs in the course's colour from its course through its topics in teaching order. A relation line is heavier the stronger the relations it merges, and ends in an arrowhead where every one of them runs the same way; relations appear once both of their topics are open.

Results update as you type. Use the up and down arrow keys to move between results, Enter to open one, and Escape to close.

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Your progress is stored in this browser and nowhere else: an identifier, the answers you have given, the mastery states and review schedule derived from them, and the lesson you last opened. Clearing it makes you a new learner on this device. It cannot be undone, and it will not affect your appearance or density settings.

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