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Free books, simulations, tools and reference sheets, chosen and shared by teachers and learners. Pick a subject and a level to see what is there.

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Gene Expression Basics

See how a gene is copied into a message and built into a protein, and what happens when a step changes. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).

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Natural Selection

Change the food, the climate and the predators, and watch the colours of a rabbit population change over generations. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).

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