physics
Balance the force
Drag the right arrow until the ball stops moving.
net force: −2 N
open lab →
★ hands-on demos
Short interactions for real concepts.
Each demo opens a matching topic when you want the full lesson or lab.
chemistry
Build a molecule
Click atoms to bond them. Goal: build H₂O.
click two atoms to bond
open lab →
bridges
Find the bridge
Click two topics that share a structural idea.
pick any two
open topic graph →
→ learning rhythm
A clear path through each topic.
The same rhythm everywhere, so attention stays on the idea, not the interface.
Locate
Find the topic on the graph. See where it lives.
Study
Walk the lesson sequence. Short pages, in order.
Play
Open the lab. Manipulate. Test recall with flashcards.
Bridge
Follow one edge. Same idea, different field.
Foundations
2Evidence, units, the shared language.
Mathematics
6The quantitative spine.
Physics
6Force, energy, waves, fields, quanta.
Chemistry
6From atoms to organic mechanism.
Biology
3Cell, molecule, gene.
Computer science
2Algorithms and information.
Bridge topics
3Where one structure shows up in a new domain.
⤳ start here