1,590 K–5 micro-topics wired into a 3,221-edge prerequisite graph. Search a concept and trace everything a learner must master before it — or explore the whole graph.
Living research digest. Assembled from source reads and primary papers, refreshed by a monthly pass — not an authored essay. It's a map of the field: skim the bold for the signal; the rest is evidence, there to dig into, not to read straight through.
What this is
A single-page, client-side browser over Marble's open skill taxonomy. No server; everything runs in your browser. Two views: a list explorer (search + trace prerequisites) and a force-directed graph (every dot a topic, colored by subject, wired by prerequisites).
age –
List explorer
Graph
💬 Talk to it
loading…
Select a topic to see its description, evidence, prerequisites, and what it unlocks.
scroll = zoom · drag = pan · hover = name · click = focus
laying out the graph…
Click a node to focus it — its prerequisites and dependents light up; the rest dims.
Ask a small AI about the taxonomy — “what should a child master before fractions?”, “trace the prerequisites of photosynthesis”, “what’s in Computing for age 6?”