AC Circuits: Impedance and Phase Shift
Compare R, RC, RL, and RLC circuits: phase, impedance, resonance.
LaunchAll Simulations
Choose simulations in physics, chemistry, biology, and math and start a lesson in minutes
Adsorption: Purifying Solutions and Gases
See how adsorption purifies solutions and gases.
LaunchAmino Acids and Peptide Bonds: How a Protein Forms
Build peptide bonds and amino-acid chains in proteins.
LaunchAmmonia Molecule (NH₃): shape, bonds, and polarity
See why NH₃ is a trigonal pyramid and polar.
LaunchAngles and Protractor: Estimate, Compare, and Build
Estimate angles, measure with a protractor, and build targets.
LaunchRabbit Breeding: Create a New Breed
Shape a breed through artificial selection across generations.
LaunchAnimal Classification
Classify animals: vertebrates, major groups, and key traits.
LaunchApollo Parachute Descent
Configure Apollo parachute descent for a safe splashdown.
LaunchApollo: Re-entry
Test Apollo reentry trajectory and the safe corridor.
LaunchAtom, Orbitals, and Quantum Numbers (s/p/d/f)
Build electron configurations and test orbital filling.
LaunchBacteria, Fungi, and Lichens
Compare bacteria, fungi, and lichens: structure and roles.
LaunchBlood Circulation: Heart and Two Loops
Follow the heart, two circulation loops, and O₂ transport.
LaunchBreathing and Gas Exchange: How the Body Gets Oxygen
Follow air to alveoli and O₂/CO₂ exchange with blood.
LaunchBuffon’s Needle: how randomness helps estimate π
Drop Buffon's needles and watch crossings approach π.
LaunchBuild the Nucleus
Build isotopes and test which nuclei stay stable.
LaunchBuoyancy: why does it float or sink?
Compare densities and buoyant force to see float, sink, or suspend.
LaunchDiversity of Cap Mushrooms
Study cap mushroom structure and key foraging safety rules.
LaunchCapacitor: Field, Energy, and RC Charging
Charge and discharge a capacitor and explore the RC time constant.
LaunchCell Lab: Structure and Organelles
Learn cell structure and plant vs. animal differences.
LaunchCharges and Fields
Place charges and explore field direction and superposition.
LaunchChemical Bonding and Molecular Geometry: Lewis + VSEPR
Build Lewis structures and compare shape and polarity.
LaunchChemical Equilibrium: Le Chatelier Principle
Change conditions and see which way equilibrium shifts.
LaunchCircular Motion: Centripetal Force
See why acceleration points inward and what sets centripetal force.
Launch2D Collisions: Momentum and Energy
Study 2D collisions, axis momentum, and energy conservation.
LaunchCollisions: Momentum and Energy
Explore momentum, kinetic energy, and collision types in 1D.
LaunchComplex Compounds
Build a complex: central ion, ligands, and coordination.
LaunchCoordinates: Points, Symmetry, Transformations
Plot shapes and test reflection, translation, and rotation.
LaunchCoulomb's Law: how charges attract and repel
Change charges and distance: attraction, repulsion, and 1/r².
LaunchCovalent Bonding: how atoms share electrons
See how atoms share electrons in covalent bonding.
LaunchCrack the Enigma
Narrow Enigma settings step by step with crib heuristics.
LaunchCrystal Lattices: structure and properties of substances
See how lattice type sets a substance's properties.
LaunchCylinder and Sphere: Volume, Surface, and Sections
Explore volume, surface area, and sections of cylinders and spheres.
LaunchDiffusion
Watch particles spread and concentrations even out.
LaunchDigestion and Enzymes: How Food Turns Into Nutrients
Trace food's path, enzymes, absorption, and pH effects.
LaunchDiscover Neptune: how mathematics found an unseen planet
Tune Planet X from Uranus perturbations, like Neptune's discovery.
LaunchDiscover π: Newton, Generalized Binomial Series, and Slow Convergence
Estimate π from quarter-circle area using Newton's method.
LaunchDNA: double helix and the code of hereditary information
Explore DNA's double helix and complementary base pairs.
LaunchEco-Balance: O₂-CO₂
Keep O₂/CO₂ and species counts balanced in an ecosystem.
LaunchElectrolysis: what appears on electrodes?
Run electrolysis and identify products at each electrode.
LaunchElectromagnetic Spectrum: One Wave - Different Frequencies
Match EM bands and link wavelength with frequency and energy.
LaunchEnergy on the Track
Watch potential energy turn kinetic, and friction turn some into heat.
LaunchEvolution and Natural Selection
Watch natural selection shift trait frequencies in beetles.
LaunchExcretory System
Trace kidney filtration and how a nephron works.
LaunchForces and Motion
Change force, mass, and friction to explore Newton's second law.
LaunchFractions: Part of a Whole and Number Line
See fractions as parts of a whole and points on a number line.
LaunchFunction Graph Transformations
Study shifts, stretch, and reflection in y = a·f(b(x - h)) + k.
LaunchGas Under a Piston: P–V–T
Explore p, V, and T for gas under a piston and Boyle–Charles laws.
LaunchGeometric Optics
Trace rays to find image position and magnification.
LaunchGlucose: open-chain form, cyclic forms, and mutarotation
Explore open and cyclic glucose forms and mutarotation.
LaunchIdeal Heat Engine: Efficiency and the Carnot Limit
Explore a heat engine: Qh, Qc, W, efficiency, and the Carnot limit.
LaunchHooke's Law: Spring and Energy
Stretch a spring and compare force, deformation, and F(x), E(x) energy.
LaunchHydrogen Bonding: why molecules attract
See how hydrogen bonding holds water molecules together.
LaunchHydrostatic Pressure
Explore how depth and density set liquid pressure through p = ρgh.
LaunchWave Interference
Combine waves to observe interference and diffraction.
LaunchIron and Corrosion: Why Rust Appears and How to Protect Metal
Test how water, salt, and coatings affect iron corrosion.
LaunchKepler's Laws
Change orbits and verify Kepler's three laws.
LaunchLaw of Universal Gravitation: how bodies attract
Change masses and distance to explore universal gravitation.
LaunchLever: torque and balance
Change mass and lever arm to find torque balance.
LaunchLimiting Reagent: Who Runs Out First?
Set reactant ratios and find the limiting reagent.
LaunchLines: y = kx + b
Graph lines, find intersections, and solve a two-line system.
LaunchSystems of Linear Equations: Two Lines
Explore two lines and the three solution types of a system.
LaunchMagnetic Field and Induction: Magnet + Coil
Move a magnet through a coil and observe induced EMF.
LaunchBuild a Base: Energy Balance
Balance the base power grid for day and night demand.
LaunchBuilding a Bridge on Mars
Build a bridge, test load limits, and compare material strength.
LaunchConnect the Circuit
Wire the base circuit and fix connection errors.
LaunchMartian Rabbits
Change habitat conditions and watch which traits aid survival.
LaunchRobots on Mars
Build a route algorithm and guide the rover to its goal.
LaunchLaunch the Rocket
Tune launch parameters and send a rocket toward Mars.
LaunchSend a Message to Earth
Send an Earth–Mars signal and measure communication delay.
LaunchMendel’s Laws: How Traits Are Inherited
Trace alleles through gametes to offspring genotypes and phenotypes.
LaunchMetallic Bonding: cations and the "electron gas"
Explore metallic bonding: conductivity and malleability.
LaunchMitosis: How a Cell Divides
Follow the phases of cell division into two daughter cells.
LaunchMobius Strip and Klein Bottle
Compare a Mobius strip, torus, Klein bottle, and plain strip.
LaunchMoon Phases: Why the Moon Changes Shape
Understand Moon phases and their link to orbital position.
LaunchNervous System: Neuron, Impulse, and Synapse
Explore action potentials, myelin, and synaptic signaling.
LaunchAllotropy of Nonmetals
Compare allotropes of carbon, oxygen, phosphorus, and sulfur.
LaunchInequalities on the Number Line
Explore inequalities, intervals, and systems on a number line.
LaunchDC Circuits Lab
Build DC circuits and compare series vs. parallel.
LaunchOrganic Chemistry: Isomerism and Functional Groups
Build isomers, spot functional groups, and compare properties.
LaunchTypes of Reactions of Organic Compounds
Spot substitution, addition, elimination, and polymerization.
LaunchParasitic Fungi: Tinder Fungus
Track tinder fungus infection in a tree and weakening signs.
LaunchElementary Particles
Classify Standard Model particles and their interactions.
LaunchSimple Pendulum
Explore how pendulum length changes period and oscillation frequency.
LaunchPercentages and Discounts: Quick Understanding
Calculate discounts, markups, tax, and check reverse problems.
LaunchpH and Neutralization: Acid + Base
Mix acids and bases and watch pH move toward neutral.
LaunchPhase Transitions: Ice → Water → Steam
Watch water phase changes and the heating temperature graph.
LaunchPhotoelectric Effect: Threshold Frequency and Stopping Voltage
Test how light frequency and voltage affect the photoelectric effect.
LaunchPhotosynthesis: Limiting Factors
Explore how light, CO₂, and water limit photosynthesis.
LaunchPhysical and Chemical Changes: signs of a chemical reaction
Watch demos and spot signs of chemical vs. physical change.
LaunchPlant Breeding: Tomato Lab
Breed a tomato variety through artificial selection over generations.
LaunchPlant Organs: root, stem, leaf, flower, fruit, and seed
Study plant organs: root, stem, leaf, flower, and fruit.
LaunchWater Transport in Plants and Transpiration
Trace water's path and effects of humidity, wind, and light.
LaunchProbability: frequency vs probability
Run trials and compare frequencies with theoretical probability.
LaunchProjectile Motion
Explore launch angle, speed, trajectory, range, and flight time.
LaunchProtein Synthesis: Transcription and Translation
See DNA to mRNA transfer and ribosome protein assembly.
LaunchPyramid and Cone: Why Volume Equals 1/3
See why pyramid and cone volume equals one-third.
LaunchParabola: quadratic function y = ax² + bx + c
Change a, b, c and watch a parabola's vertex, axis, and roots.
LaunchLab Practice: Qualitative Reactions in Inorganic Chemistry
Run qualitative reactions and identify ions by their signs.
LaunchReaction Rate and Catalyst
Test how temperature, concentration, and catalyst change rate.
LaunchRedox Reactions: who donates and who accepts electrons
See who donates and accepts electrons in redox reactions.
LaunchRedox and Galvanic Cell: Build a Battery
Build a galvanic cell and trace electron and ion flow.
LaunchRiemann Sum Builder
Build integrals from rectangles and trapezoids by changing n.
LaunchRutherford: Scattering by the Nucleus
Explore Rutherford's experiment: alpha particles and a mostly empty atom.
LaunchSky Above the Horizon: Planets, the Ecliptic, and the Zodiac
Find planets using the horizon, ecliptic, and sky position.
LaunchSolutions and Dilutions: C₁V₁ = C₂V₂
Prepare and dilute solutions and verify concentration.
LaunchWater Mixing Dynamics
Mix solutions and watch concentration even out over time.
LaunchSound: Pitch, Loudness, and Wave
See how frequency sets pitch, amplitude sets loudness, and waves travel.
LaunchStatistics: mean, median, mode, and outliers
Move points and compare mean, median, mode, and outliers.
LaunchUnit Circle: sin and cos
Rotate on the unit circle and link sin(θ) and cos(θ).
LaunchVectors on the Plane: Magnitude, Direction, and Addition
Learn coordinates, magnitude, projections, and vector addition.
Launch