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Free science and math simulations for teaching STEM topics, including physics, chemistry, biology, and math, from University of Colorado Boulder

Explore the states of matter with interactive simulations that show how molecules form solids, liquids, and gases.

Build and test circuits with batteries, resistors, light bulbs, and switches. Learn about series and parallel circuits, Ohm's law, and conductors and insulators.

‪Density‬ - PhET Interactive Simulations

‪Natural Selection‬ - PhET Interactive Simulations

Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!

Experiment with an electronics kit! Build circuits with batteries, resistors, ideal and non-Ohmic light bulbs, fuses, and switches. Determine if everyday objects are conductors or insulators, and take measurements with an ammeter and voltmeter. View the circuit as a schematic diagram, or switch to a lifelike view.

Explore energy conservation with a virtual skater in different skate parks and see energy graphs.

Explore how organisms with different traits survive various selection agents within the environment.

‪My Solar System‬ - PhET Interactive Simulations