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Science you can touch.
Build atoms, wire circuits, swing pendulums and open up living cells. Every simulation explains what is happening and how scientists found out, with guided tours and quizzes that tell you why an answer is right.
Pick a subject
- ChemistryBuild atoms, pull electrons off them, bond molecules, mix chemicals in a virtual lab and fuse nuclei like the Sun.Open Chemistry
- PhysicsRead a Vernier caliper and screw gauge, time a pendulum, make waves and sound, launch projectiles, wire circuits and bend light through lenses.Open Physics
- BiologyOpen a 3D cell, watch osmosis, enzymes and photosynthesis at work, watch cells divide by mitosis and meiosis, and follow blood through a beating 3D heart.Open Biology
Chemistry simulations
- Atom BuilderAdd protons, neutrons and electrons and watch any of the 118 elements, isotopes and ions take shape.
- Electron LabFire photons at an atom: watch electrons jump between shells, glow in colour and finally escape.
- Molecule BuilderDrag atoms together to form single, double and triple bonds and discover real molecules.
- Chemistry LabPour chemicals into a beaker, heat them over a Bunsen burner and watch real reactions.
- States of MatterHeat ice until it melts and boils: watch the particles change and the heating curve draw itself, flat steps and all.
- Chemical EnergeticsCollide molecules over an activation-energy hill and watch exothermic reactions heat up and endothermic ones cool down.
- ElectrolysisSwitch on a power pack and watch ions drift to the electrodes: copper plates the cathode and gases bubble into the tubes.
- Nuclear FusionHeat a plasma and fire nuclei together to see how the Sun turns mass into energy.
- Chemistry FormulasEvery chemistry equation, live: type numbers or pull them from what you built.
Physics simulations
- Vernier Caliper & Screw GaugeSlide the jaws of a Vernier caliper or turn a screw gauge, read the scales and check your reading.
- Motion GraphsDrive a car and watch its distance–time, velocity–time and acceleration–time graphs draw themselves live.
- Forces & Newton's LawsPull a crate across wood, ice or rubber and watch its free-body diagram, friction and F = ma, live.
- Energy Skate ParkDrop a skater into a half-pipe and watch kinetic, potential and thermal energy swap, while the total stays the same.
- Momentum & CollisionsCrash carts on an air track, elastic or sticky, and see momentum conserved every time while kinetic energy is not.
- Pendulum LabChange the length, mass and planet, time the swings and work out g from your own graph.
- Waves & SoundMake waves on a rope, see and hear sound, pluck a 3D guitar and hit a drum: wavelength, frequency and v = fλ.
- Projectile MotionLaunch a ball at any angle and speed, hit the target and see why 45° goes furthest.
- Circuit BuilderDrag batteries, bulbs, resistors and switches onto a board and watch the current flow.
- Lenses & LightMove an object past a lens or mirror and watch the rays form real and virtual images.
- Physics FormulasEvery physics equation as a calculator: solve for any value, or fill it from your own experiments.
Biology simulations
- Cell ExplorerSpin a 3D animal or plant cell, click each organelle and find out what it does.
- Virtual MicroscopeLoad a slide, switch lenses and focus on onion cells, cheek cells, blood and more.
- Diffusion & OsmosisWatch particles spread out, water cross a membrane, and cells swell, burst or shrivel in different solutions.
- Enzyme LabFit substrates into active sites, then heat, change the pH and add inhibitors until the enzyme denatures.
- Photosynthesis & RespirationCount the oxygen bubbles from pondweed under a lamp and find the limiting factor, day and night.
- PollinationFly a bee round a 3D garden: carry pollen, watch the pollen tube grow and see fruit and seeds form.
- Cell Division: Mitosis & MeiosisStep through mitosis and meiosis: chromosomes copy, line up, cross over and pull apart.
- DNA BuilderPair the bases, unzip the helix, make mRNA and translate it into a protein.
- Heart & CirculationFollow blood through the four chambers and valves, read the ECG and see exercise change cardiac output.
- Biology FormulasEvery biology equation as a calculator: magnification, Hardy–Weinberg, cardiac output and more.
Latest articles
- Chemistry
Electrolysis Explained: What Happens at Each Electrode
Electrolysis splits ionic compounds with electricity. Learn what forms at the cathode and anode, how to write half equations, why brine gives hydrogen, and try it in 3D.
21 October 2026 · 6 min read - Chemistry
Exothermic and Endothermic Reactions Explained
Exothermic reactions give out heat; endothermic ones take it in. Learn why, read energy profile diagrams, work out ΔH from bond energies and watch molecules react in 3D.
21 October 2026 · 6 min read - Biology
How Temperature Affects Enzyme Activity (and Why)
Warmth speeds enzymes up until the optimum, then heat denatures them for good. The rate graph explained, plus the effect of pH, the lock and key model and exam answers.
21 October 2026 · 6 min read
