A periodic table where you can drag various elements around, and see which ones interact with which. Created by the Museum of Science and Industry in Chicago.
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Foldit
Fold proteins as best as you can. A classic ‘citizen science’ game where by playing you can help investigate the science of how proteins get their shapes.
Eterna
Learn how RNA fits together by playing this game. Created by Nova Labs.
Emoji Simulator
Basically lets you recreate The Game of Life, but with emoji and any rules you’d like to put in. Created by Nicky Case.
Crack the Circuit
Great game about recreating circuits based on a mystery setup. Good for testing knowledge about circuits. Created by Universe & More.
Concord Consortium List
A collection of science interactives by Concord Consortium.
Circuit Construction Kit
Nice tool for easily creating and testing simple circuits, built by PhET.
Physion
Build tons of 2D physics simulations with this free resource. Easy to check out, tons of cool stuff you can do with it. Created by Dimitris Xanthopoulos.
Ricky Reusser Collection
A lot of cool interactive math-y explorables to check out. Created by Ricky Reusser.
Gravity with Poisson Equation
Cool look at gravity of many, many bodies, calculated on a mesh. Looks neat, too. Created by Ricky Reusser.