Biology
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OpenNeuron action potential
Fire an impulse, replay it and measure how fast it travels 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, and see the bond order.
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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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OpenSubstitution and elimination lab
Compare SN1, SN2, E1, and E2 in 3D, follow bond changes, and see how conditions favor each pathway.
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
Most pages have a short list of what you'll learn and a few things to try, then the science and equations at the bottom.