Immersive 3D Labs
Spin molecules, launch projectiles, shift supply curves, and play every chord. 116 interactive labs across 18 subjects — drag, click, and explore.
Chemistry
Interactive Periodic Table
Every element, one tap away
Hover a category to isolate it, click any element for its mass, group, period, and full electron configuration.
3D Molecule Viewer
Rotate real molecules in 3D
Ball-and-stick models of water, methane, benzene and more — see bond angles and molecular shape from every side.
Bohr Atom Builder
Electron shells, element by element
Watch electrons fill shells (2, 8, 18…) across the periodic table and read off valence electrons at a glance.
VSEPR Geometry Lab
Why molecules bend the way they do
Linear, trigonal, tetrahedral, octahedral — see how lone pairs squeeze bond angles in 3D.
Ionic Crystal Lattice
Inside a salt crystal
Fly through the repeating NaCl and CsCl lattices and see how ion size sets the coordination number.
Acid–Base Titration
Chase the equivalence point
Add titrant drop by drop and watch the pH curve climb through the buffer region to the equivalence point.
Kinetic Molecular Theory
Gas particles you can heat & squeeze
Watch gas particles bounce in a box. Turn up temperature or shrink the volume and see pressure climb — PV = nRT, live.
Le Châtelier Equilibrium
Stress a reaction, watch it shift
Heat and cool the N₂O₄ ⇌ 2NO₂ equilibrium and watch the balance of reactants and products shift to counteract the stress.
Orbital Probability Studio
Rotate and test electron probability and quantum numbers
Increasing principal energy level expands the most probable electron distance and changes the allowed sublevels.
Reaction Energy Landscape
Rotate and test activation energy and catalysis
A catalyst lowers the activation barrier without changing the reactant–product energy difference or equilibrium constant.
Biology
DNA Double Helix
Base pairs in 3D
A rotating double helix with color-coded A–T and G–C base pairs and a sugar–phosphate backbone.
Mitosis Animation
Watch a cell divide
Step through prophase to telophase as chromosomes condense, align, and separate into two daughter cells.
3D Animal Cell Explorer
Click any organelle
Orbit a whole animal cell and click the nucleus, mitochondria, ER, Golgi and more to learn what each does.
Neuron Action Potential
Watch a nerve impulse fire
A depolarization wave races down a myelinated axon. Step through resting, depolarization, repolarization and the refractory period.
Transcription & Translation
The central dogma, base by base
Type a DNA strand and watch RNA polymerase build the mRNA (A→U!), then a ribosome read codons into a growing protein via the real genetic code.
Enzyme Active-Site Studio
Rotate and test induced fit and reaction rate
Substrate concentration raises collision frequency until active sites saturate; extreme pH can alter protein shape.
Ecosystem Energy Web
Rotate and test trophic transfer and biomass
Only a fraction of energy becomes production at the next trophic level, so available energy and biomass decline upward.
Physics
Projectile Motion Lab
Launch, trace, and measure
Fire projectiles at any speed and angle, watch the velocity vectors evolve, and prove that 30° and 60° share a range.
Pendulum & Springs (SHM)
Why mass doesn’t matter (sometimes)
Swing a pendulum on Earth or the Moon and race it against a mass on a spring — see which period cares about mass.
Collision & Momentum Lab
Momentum never lies
Crash two carts elastically or perfectly inelastically and watch the momentum bars stay fixed while kinetic energy tells the truth.
Electric Field Visualizer
See the invisible field
Drag point charges around and watch the field arrows and potential shading respond — then drop a test charge and let it ride.
Wave Interference Lab
Where waves add and cancel
Two ripple sources build stable bright and dark lines; watch the exact double-slit pattern and its fringe spacing Δy = λL/d change live.
Torque Balance Studio
Rotate and test torque, lever arm, and equilibrium
Rotational equilibrium requires clockwise and counterclockwise torques to sum to zero, not merely equal forces.
Energy Skate Track
Rotate and test energy conservation and nonconservative work
Gravitational potential trades with kinetic energy; friction transfers mechanical energy into thermal energy.
Circuit Field Studio
Rotate and test electric potential and current
Potential differences drive charge flow, while equivalent resistance determines current for a fixed source voltage.
Thermodynamic State Surface
Rotate and test pressure, volume, and temperature
For a fixed amount of ideal gas, state changes must satisfy PV=nRT and process paths determine work.
Angular Momentum Gyroscope
Rotate and test angular momentum and torque
With negligible external torque, angular momentum is conserved; changing moment of inertia changes angular speed.
Lagrangian Potential Well
Rotate and test stable equilibrium and oscillation
Motion near a stable minimum approximates simple harmonic motion because the potential is locally quadratic.
Magnetic Flux Studio
Rotate and test flux and induced emf
Changing magnetic flux—not merely a large field—produces induced emf, with direction opposing the change.
RC Transient Network
Rotate and test capacitor charging and time constant
The time constant RC sets the exponential charging and discharging rate, independent of the final source voltage.
Earth & Environment
Greenhouse Energy Balance
Why more CO₂ means a warmer surface
Balance incoming sunlight against outgoing infrared. Turn up greenhouse gases or albedo and watch the equilibrium temperature move.
Carbon Reservoir Network
Rotate and test carbon stores and fluxes
Human combustion moves geologic carbon into the atmosphere faster than major natural sinks remove it.
Watershed Runoff Terrain
Rotate and test land cover and runoff
Impervious cover reduces infiltration and increases the height and speed of storm runoff reaching streams.
Math & Statistics
Tangent & Area Explorer
The Fundamental Theorem, live
Drag a point along a curve to read its slope, then shade the accumulated area — derivative and integral, connected before your eyes.
Central Limit Theorem Simulator
Watch skew become normal
Sample from uniform, skewed or bimodal populations and watch the distribution of sample means pile up into a bell curve with SD σ/√n.
Derivative Surface Explorer
Rotate and test local linearity and derivatives
The derivative is the limiting slope of secant lines and predicts local change, extrema, and motion.
Accumulation Orbit
Rotate and test net change and definite integrals
A definite integral accumulates signed rate; negative rate subtracts from net change even when total distance grows.
Taylor Approximation Studio
Rotate and test series approximation and error
Adding terms improves a Taylor approximation near its center, while interval and derivative bounds control the error.
Parametric Motion Track
Rotate and test parametric velocity and arc length
Parametric derivatives combine component rates, and speed is the magnitude of the velocity vector.
Unit Circle Helix
Rotate and test radians and periodic functions
One revolution is 2π radians; sine and cosine are coordinates whose periodic patterns follow circular motion.
Function Transformation Space
Rotate and test translations, stretches, and reflections
Changes inside a function act horizontally and inversely, while outside changes act vertically.
Confidence Interval Landscape
Rotate and test sampling variability and margin of error
Larger samples reduce standard error; higher confidence widens intervals when all else is fixed.
Regression Residual Cloud
Rotate and test least-squares fit and residuals
The least-squares line minimizes squared residuals, while patterns in residuals reveal model inadequacy.
Computer Science
Sorting & Searching Visualizer
Watch the algorithm think
Step through Bubble, Selection, Insertion and Merge sort — plus Binary Search — with live comparison/swap counters and Big-O labels.
Object Reference Graph
Rotate and test objects, aliases, and mutation
Two variables can reference one object, so mutation through either alias is visible through the other.
Recursion Call Stack
Rotate and test recursive state and base cases
Each call owns a stack frame; a valid base case stops growth and return values unwind in reverse order.
Zero-Trust Access Graph
Rotate and test identity, policy, and least privilege
Access decisions should verify identity, device, resource, and context rather than trusting network location.
Attack-Surface Lattice
Rotate and test threat paths and layered controls
Removing reachable services and adding independent controls reduces viable attack paths more reliably than one perimeter defense.
Packet Route Topology
Rotate and test routing, latency, and resilience
Routers forward by destination prefixes; redundant paths improve resilience but path choice affects latency.
Subnet Address Cube
Rotate and test prefix length and address space
A longer prefix creates smaller subnets with fewer host addresses and more network boundaries.
Internet Abstraction Stack
Rotate and test protocol layers and abstraction
Layered protocols hide lower-level details so applications can work across heterogeneous networks.
Data Bias Network
Rotate and test training data and algorithmic bias
An algorithm can reproduce sampling and labeling bias even when its code never explicitly uses a protected category.
Economics
Supply & Demand Lab
Shift the curves, find the price
Shift supply and demand with real-world scenarios, watch equilibrium move, and see consumer and producer surplus recompute live.
AD–AS Policy Simulator
Close the output gap
Shift aggregate demand and supply with fiscal, monetary, and supply-shock buttons and watch GDP, the price level, and unemployment respond.
Monetary Transmission Network
Rotate and test interest rates, investment, and aggregate demand
Policy rates influence broader financial conditions, spending, output, employment, and inflation with lags.
Long-Run Growth Surface
Rotate and test capital, productivity, and living standards
Sustained per-person growth ultimately depends on productivity, while capital deepening faces diminishing returns.
Market Structure Landscape
Rotate and test competition, pricing, and efficiency
Market power allows price above marginal cost, reducing output and creating deadweight loss relative to competition.
Externality Balance Studio
Rotate and test social and private costs
When marginal social cost differs from marginal private cost, the unregulated market quantity is inefficient.
Business
Compound Growth Orbit
Rotate and test time value of money
Compounding rewards time and rate, while fees and inflation reduce real accumulated value.
Household Risk Balance
Rotate and test liquidity, return, and risk
Sound financial plans balance emergency liquidity, insurance, diversification, debt cost, and long-term return.
Government
Redistricting & Gerrymandering
Same voters, different maps
Re-draw district lines on a fixed electorate and watch packing and cracking flip the seat count — the math behind Baker v. Carr and Shaw v. Reno.
Checks and Balances Network
Rotate and test separated institutions sharing power
Branches have distinct powers but share policymaking, creating veto points, bargaining, and accountability.
Public Opinion Coalition Space
Rotate and test ideology, linkage institutions, and voting
Political behavior reflects interacting identities, institutions, information environments, and issue priorities.
Regime Authority Matrix
Rotate and test legitimacy, capacity, and accountability
Regimes vary independently in state capacity, democratic accountability, and sources of legitimacy.
Electoral System Simulator
Rotate and test rules, parties, and representation
District magnitude and electoral formula shape party systems, proportionality, and incentives for coalition.
Social Sciences
Memory Systems Network
Rotate and test encoding, storage, and retrieval
Memory performance depends on attention, encoding depth, consolidation, cues, and interference.
Research Inference Balance
Rotate and test design, bias, and valid conclusions
Random assignment supports causal inference; random sampling supports population generalization.
Psychology
Classical & Operant Conditioning
Pavlov and Skinner, live
Condition a salivation response then extinguish it, and watch how each reinforcement schedule (FR/VR/FI/VI) shapes the cumulative-response curve.
Brain Region Explorer
Click a region, learn its job
Explore a labeled brain — hippocampus, amygdala, the four lobes, cerebellum and more — with the classic studies, then quiz yourself.
Human Geography
Population Pyramids & the DTM
Watch a nation age
Slide through the Demographic Transition Model and watch the population pyramid reshape, with live CBR, CDR, NIR and doubling-time readouts.
Urban Land-Use Terrain
Rotate and test accessibility, rent, and land use
Land value and use reflect accessibility, transportation, regulation, and competition rather than distance alone.
Migration Network Studio
Rotate and test push-pull factors and networks
Migration networks lower information and settlement costs, making prior flows influence later flows.
History
Primary Source Analyzer
HIPP a real document
Work through eight public-domain primary sources with guided Historical-situation, Intended-audience, Point-of-view and Purpose prompts — DBQ practice.
Causation Timeline Studio
Rotate and test multiple causes and turning points
Historical outcomes usually combine long-term conditions, short-term catalysts, and contingent choices.
Federal Power Balance
Rotate and test federalism across eras
The balance of state and federal power shifts through legislation, court interpretation, crisis, and political coalition.
Exchange Network Studio
Rotate and test trade, diffusion, and disease
Connectivity moves goods, ideas, technologies, people, and pathogens, producing unequal regional effects.
Empire Continuity Timeline
Rotate and test state expansion and administration
Empires combine coercion, taxation, local intermediaries, and legitimizing ideologies to govern diverse populations.
Revolution Pressure Surface
Rotate and test political, social, and economic causes
Revolutions become more likely when fiscal crisis, elite division, popular grievance, and mobilizing ideas reinforce one another.
Industrial Society Network
Rotate and test industrialization and social change
Industrial production reorganized class relations, urban life, family labor, and political movements.
Diaspora Connection Network
Rotate and test movement, culture, and identity
African diasporic communities created new identities through forced migration, resistance, cultural retention, and exchange.
Freedom Struggle Timeline
Rotate and test continuity and change in Black freedom movements
Strategies changed across eras while recurring demands for citizenship, safety, economic power, and self-determination persisted.
English
Rhetorical Situation Orbit
Rotate and test speaker, audience, purpose, and exigence
Effective rhetorical choices depend on the relationship among writer, audience, purpose, context, and constraints.
Argument Line-of-Reasoning Map
Rotate and test claims, evidence, and warrants
Evidence supports a claim only when a warrant explains why the evidence logically matters.
Narrative Perspective Space
Rotate and test point of view and reliability
Narrative distance and limited knowledge shape what readers can infer and whether a narrator is trustworthy.
Motif Meaning Network
Rotate and test recurrence, contrast, and theme
A motif becomes analytically useful when its changing contexts reveal a pattern that develops a theme.
Languages & Culture
Cultural Comparison Network
Rotate and test products, practices, and perspectives
Strong comparisons connect observable practices and products to underlying perspectives in both communities.
Register and Audience Orbit
Rotate and test formal and informal communication
Purpose, relationship, and context determine pronoun choice, register, organization, and tone.
Literary Movement Timeline
Rotate and test texts in historical and aesthetic context
Literary form and theme respond to changing political, social, and artistic contexts across the required works.
Intertextual Motif Network
Rotate and test motifs across the reading list
Comparing a motif across texts reveals how genre, era, and perspective reshape its meaning.
Francophone Culture Network
Rotate and test regional diversity and comparison
Francophone communities share a language while differing in history, identity, institutions, and daily practices.
Communication Mode Orbit
Rotate and test interpretive, interpersonal, and presentational skills
Successful performance adapts comprehension and production strategies to the mode, audience, and purpose.
Character Component Lattice
Rotate and test radicals, phonetics, and meaning
Many characters combine semantic and phonetic components that support recognition without guaranteeing pronunciation.
Tone Contour Studio
Rotate and test lexical tone and intelligibility
Pitch contour distinguishes words, and connected speech changes realization without erasing tonal contrast.
Clause Structure Network
Rotate and test verb position and subordination
German word order marks clause type: finite verbs occupy second position in main clauses and final position in subordinate clauses.
Case Relationship Lattice
Rotate and test case, gender, and syntactic role
Case endings signal grammatical role, allowing word order flexibility while preserving meaning.
Agreement Lattice
Rotate and test gender, number, and participles
Italian agreement patterns connect nouns, modifiers, pronouns, and sometimes past participles.
Italian Culture Timeline
Rotate and test tradition, regionalism, and modern change
Cultural comparison improves when claims distinguish national patterns from regional and generational variation.
Register Hierarchy Studio
Rotate and test plain, polite, and honorific language
Social relationship and setting shape verb forms, address terms, and honorific or humble choices.
Writing-System Network
Rotate and test kanji, hiragana, and katakana
Japanese scripts divide semantic, grammatical, and borrowed-word work while interacting within one sentence.
Syntax Dependency Network
Rotate and test case endings and clause structure
Inflection marks syntactic relationships, so translation should follow endings and constructions rather than surface word order.
Epic Theme Timeline
Rotate and test Roman values in Vergil and Caesar
Close reading links diction and syntax to leadership, duty, violence, empire, and Roman identity.
Arts
Form-Context Gallery Space
Rotate and test visual form, function, and context
Formal choices gain meaning through patronage, audience, site, materials, ritual, and historical context.
Global Influence Network
Rotate and test exchange, appropriation, and adaptation
Artistic forms travel through trade, empire, migration, and media, but are transformed by local purposes.
Voice-Leading Lattice
Rotate and test harmonic function and part writing
Good tonal voice leading resolves tendency tones, avoids parallels, and preserves independent melodic lines.
Form and Cadence Timeline
Rotate and test phrase structure and harmonic arrival
Cadences articulate phrase boundaries and formal function through coordinated melodic and harmonic closure.
Composition Depth Plane
Rotate and test hierarchy, contrast, and movement
Scale, placement, contrast, repetition, and negative space guide attention and organize a two-dimensional work.
Sustained Investigation Network
Rotate and test inquiry, revision, and evidence
A strong portfolio documents how materials, processes, experimentation, and revision advance one inquiry.
Spatial Form Studio
Rotate and test mass, volume, and negative space
Three-dimensional meaning changes with viewpoint as mass, void, balance, surface, and site interact.
Material Process Lattice
Rotate and test material choice and construction
Material properties and fabrication constraints are conceptual decisions, not merely technical afterthoughts.
Mark-Making Surface
Rotate and test line, value, and illusion of form
Pressure, density, edge, and value structure turn marks into volume, atmosphere, and emphasis.
Drawing Inquiry Network
Rotate and test experimentation and revision
A sustained investigation gains depth when visual decisions evolve in response to discoveries and failures.
Music
Capstone
Evidence Conversation Network
Rotate and test perspectives, claims, and source relationships
Synthesis places sources in conversation by tracing agreement, tension, assumptions, and implications.
Argument Architecture Studio
Rotate and test line of reasoning and qualification
A defensible argument aligns claims, evidence, warrants, counterarguments, limitations, and conclusions.
Method Alignment Matrix
Rotate and test question, method, data, and inference
A method is justified when its data and analysis can actually answer the research question at the claimed scope.
Research Process Timeline
Rotate and test proposal, collection, analysis, and reflection
Transparent research records decisions, ethics, limitations, and changes so conclusions can be evaluated.