Resources
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.
Pick a subject to see its topics.
Reading MaterialExternal link
The official school textbooks, free to read and download. Look for the Science book of your class, or the Physics book for classes 11 and 12. Our chapters follow their order.
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The official school textbooks, free to read and download. Look for the Science book of your class, or the Chemistry book for classes 11 and 12.
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The official school mathematics textbooks, free to read and download. Pick the book of your class. Our chapters follow their order.
Reading MaterialExternal link
The official school textbooks, free to read and download. Look for the Science book of your class, or the Biology book for classes 11 and 12.
Example ProgramsExternal link
Hundreds of example graphs with their code. Find one that looks like what you want, and change the numbers.
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Free videos and practice on data, averages, probability and the first ideas of inference.
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A university course in mechanics with lecture notes, problems and solutions, free from MIT. Use it after the chapters on motion, forces and energy here.
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A clear periodic table where you can click an element and see its properties, trends and isotopes. Handy while you read the chapters on the periodic table.
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Free videos, articles and practice for school mathematics, from arithmetic to calculus. Good when you want to see an idea explained a second way.
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Free videos and articles on cells, genetics, evolution and ecology. A good second explanation for any lesson.
Tools and EditorsExternal link
Paste a program, and watch it run one line at a time, with the variables drawn as boxes. Excellent when a loop or a function is not clear.
DatasetsExternal link
Draw life expectancy, income and population of every country over two hundred years. A great source of real data for a project.
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A full free textbook on mechanics, waves and thermodynamics, with worked examples and exercises. Good for going beyond the school level. Free to read online, from OpenStax at Rice University, licensed under CC BY 4.0.
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Type the name or formula of a substance and see its structure, properties and uses. It is run by the US National Library of Medicine and is free.
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A free textbook on functions, polynomials, exponents and trigonometry, with many practice problems. Free to read online, from OpenStax at Rice University, licensed under CC BY 4.0.
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A complete free biology textbook, from cells to ecosystems, with figures and review questions. Free to read online, from OpenStax at Rice University, licensed under CC BY 4.0.
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A free book of small, useful programs: working with text, files, spreadsheets and the web. Good once you finish Essentials.
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A free textbook that takes you from data and probability to regression, with real examples. A good next step after First Steps.
SimulationsExternal link
Stretch a spring and see the restoring force, displacement, and potential energy relate to each other. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
Reading MaterialExternal link
A large open library of chemistry texts written by teachers and professors. Use the search box to find the topic of your chapter.
SimulationsExternal link
Change the slope and the intercept, and see the line, its equation and points move together. Pairs with the lessons on linear equations. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
SimulationsExternal link
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).
Reading MaterialExternal link
A friendly book that teaches programming as a way of thinking, with many exercises. Free to read online.
Reading MaterialExternal link
Interactive pictures of probability and statistics from Brown University. You can drag, click and watch the ideas move.
SimulationsExternal link
Drag objects across a surface and watch friction generate heat at the atomic level. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).