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Calibrating instruments…
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Osmosis you can weigh — water potential, diffusion and surface area.
The quantitative heart of cell biology. These simulations model the real bench — potato cylinders on a balance, a sucrose dilution series, agar cubes racing acid — so students measure osmosis as a mass change, read a tissue's water potential straight off a graph, and see why the surface-area-to-volume ratio decides how fast anything reaches the middle of a cell.
Beyond the open showcase, subscribed schools get the growing library of Cells, Transport & Membranes experiments — searchable, tagged by concept and difficulty, and expanding continuously.