Biology
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OpenNeuron laboratory
Fire an impulse, replay its journey, and measure conduction between two probes. Compare single-cell firing and a spatial axon model.
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OpenCardiac action potential
Explore a heart cell's calcium-supported plateau, compare it with a neuron, and measure recovery with paired-pulse experiments.
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OpenDNA replication
Watch helicase open the fork while DNA polymerase builds the leading strand in one piece and the lagging strand in Okazaki fragments.
Chemistry
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OpenMolecular orbitals
Build s, p and d orbitals in 3D, then combine two atoms into σ and π bonding and antibonding orbitals, with bond order worked out for you.
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OpenCyclohexane chair flip
Rotate and flip a cyclohexane ring, track axial and equatorial groups, and compare substituted chairs with orgo 1 practice questions.
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OpenNewman projection explorer
Rotate a single bond in 3D, follow its Newman projection, and compare staggered, eclipsed, anti, and gauche conformations on an energy curve.
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OpenSN2 reaction viewer
Follow backside attack and bond changes in 3D, inspect the transition state, and predict the stereochemistry of substitution products.
Physics
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OpenWave interference
Place two wave sources and see where they add up and where they cancel. Change wavelength, amplitude and spacing in real time.
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OpenQuantum mechanics
Four experiments in one: the double slit, wave functions in a box and on a spring, tunneling through a barrier, and the uncertainty principle.
Mathematics
Astronomy
Each page
- Learn the goalIt opens with what you'll learn, so you know what to look for.
- ExperimentUse the “Try this” instructions to set up an experiment, then adjust the controls to compare results.
- UnderstandIt ends with the science and equations behind what you just saw.