First visit
Start cleanly
Open one strong concept first.
If you have not started anything yet, open a strong first concept or move straight into the starter tracks.
Open Model Lab
Learn science by changing live simulations.
Open a visual model, move one control, and connect what changes in the scene, graph, and explanation.
Live bench
This preview shows the core pattern: change one variable, then read the motion and graph together.
Pick up where you left off
Pick up where you left off or start with a strong first concept.
Continue learning
Resume saved work or take the next bounded step.
Keep the next concept, track, or review action visible without turning the homepage into a full dashboard.
Local-first by default, synced when you sign in
Explore nextExplore next
Start with concepts or a topic page.
If you want a broader map before you begin, open concepts or a topic page next.
Concepts
Open concepts when you want the full map.
97 concepts stay in one place, with subjects, topics, and tracks ready when you want more structure.
01
See the system
Each concept starts with a live bench so the idea arrives after the behavior makes sense.
02
Change one thing
Controls stay tied to meaningful parameters, so cause and effect stay obvious while you explore.
03
Read the graph or readout
The page pairs the live bench with labeled graphs, planes, and readouts rather than hiding the relationship.
Direct start
Simple Harmonic Motion
Open one strong concept first, then explore more from there.
Open SHMStarter track
Gravity and Orbits
5 linked concepts when you want a short guided sequence instead of choosing every concept yourself.
Start Gravity and OrbitsNext-step routes
Keep the main route choices visible.
These quick links stay open so the right path does not hide inside the expandable previews below.
Route previews
Preview each route before you commit.
Open these panels when you want a few examples first. The main route links stay visible above.
Guided starts
Preview guided starts
See a few starter tracks and guided paths before opening the full lists.
Guided starts
Preview guided starts
See a few starter tracks and guided paths before opening the full lists.
Starter tracks
Open all tracksStarter track5 concepts135 min
Gravity and Orbits
Start with one source mass creating a field and potential well, then use that same gravity model to explain circular speed, orbital periods, and the escape threshold.
Starts with Gravitational Fields across 5 concepts.
Starter track6 concepts139 min
Functions and Change
Keep the first math path compact: read parent-curve moves first, then rational asymptotes and domain breaks, then exponential growth and decay, local slope, visible limit behavior, and finally accumulation so change stays graph-first all the way through.
Starts with Graph Transformations across 6 concepts.
Starter track2 concepts50 min
Rates and Equilibrium
Start with successful collisions setting reaction rate, then reuse the same chemistry language inside a reversible system that re-balances after a disturbance.
Starts with Reaction Rate / Collision Theory across 2 concepts.
Guided paths
Open guided pathsLesson set4 steps9 concepts
Waves Evidence Loop
Use one topic page, one starter track, and one focused challenge so the wave story stays bounded for a teacher-led lesson block.
A sequenced set of 9 concepts.
Lesson set6 steps6 concepts
Electricity Bridge Lesson Set
Move from field cause to voltage to the first full electricity track without leaving the current concept, topic, and challenge surfaces.
A sequenced set of 6 concepts.
Playlist5 steps11 concepts
Electricity to Magnetism Bridge
Use the existing electricity recap, magnetic starter track, and Maxwell capstone surfaces to move into electromagnetism without turning the branch into a full LMS sequence.
A sequenced set of 11 concepts.
Lesson set4 steps7 concepts
Functions and Change Lesson Set
Use the functions topic page, the existing graph-first starter track, one accumulation checkpoint, and the calculus topic page so the early math branch stays compact for a teacher-led lesson block.
A sequenced set of 7 concepts.
Lesson set4 steps7 concepts
Vectors to Mechanics Bridge
Use the vectors topic page, the short bridge track, one endpoint checkpoint, and the mechanics topic page so the math-to-motion handoff stays compact and teacher-usable.
A sequenced set of 7 concepts.
Lesson set4 steps9 concepts
Complex and Parametric Motion Lesson Set
Use the complex-and-parametric topic page, the authored starter track, one parametric-motion checkpoint, and the vectors topic page so the plane-based math branch stays compact and teacher-usable.
A sequenced set of 9 concepts.
Lesson set4 steps6 concepts
Rates and Equilibrium Lesson Set
Use the chemistry topic page, the compact starter track, one rebalance checkpoint, and the solutions-and-pH topic page so the chemistry branch feels packaged instead of isolated.
A sequenced set of 6 concepts.
Lesson set4 steps7 concepts
Stoichiometry and Yield Lesson Set
Use the stoichiometry topic page, the compact starter track, one percent-yield checkpoint, and the solutions-and-pH topic page so chemistry quantities stay bounded and teacher-usable.
A sequenced set of 7 concepts.
Lesson set4 steps6 concepts
Solutions and pH Lesson Set
Use the solutions-and-pH topic page, the authored starter track, one buffer checkpoint, and the rates-and-equilibrium topic page so the broader chemistry branch stays compact and teacher-usable.
A sequenced set of 6 concepts.
Playlist4 steps6 concepts
Algorithms and Search Playlist
Use the algorithms-and-search topic page, the compact starter track, one focused graph-traversal revisit, and filtered challenges so the CS branch stays bounded and extension-ready.
A sequenced set of 6 concepts.
Subjects and topics
Preview subject and topic maps
See a few subject pages and topic hubs before opening the full directories.
Subjects and topics
Preview subject and topic maps
See a few subject pages and topic hubs before opening the full directories.
Subjects
Open subjectsSubject4 topics16 concepts
Math
Enter the current math slice through graph transformations, rational-function asymptotes, exponential change, vectors, complex-plane geometry, trig identities, inverse-angle reasoning, polar coordinates, and parametric motion without leaving the same live-bench product language used elsewhere on the site.
Functions and Change is the clearest bounded first route.
Subject1 topic6 concepts
Computer Science
Enter the current computer-science slice through one bounded algorithms-and-search branch where visible list work now widens into one shared graph-traversal bench without leaving the product's simulation-first architecture.
Algorithms and Search Foundations is the clearest bounded first route.
Topics
Open topicsTopicMath3 concepts
Functions
Use parent-curve moves, a shifted reciprocal family, and one exponential bench so graph moves, asymptotes, domain breaks, growth versus decay, and target-time questions stay tied to the same visual branch before the math path widens into local and accumulated change.
Graph transforms is still the cleanest first concept here.
Challenges
Preview challenge practice
See how challenge practice fits before opening the full set of 172 challenges.
Challenges
Preview challenge practice
See how challenge practice fits before opening the full set of 172 challenges.
Open challenges when you want a concrete problem instead of free exploration.
Open challengesQuestions or feedback?
Tell us what still feels confusing.
If a page feels crowded or hard to follow, send feedback and tell us where you got stuck.