Free, open-source interactive lessons in maths and more — one tree of knowledge you climb at your own pace, with animations, randomized quizzes, and progress tracking. No sign-up, no ads.

For the longest time, I have been inspired by Neal Stephenson's The Diamond Age, to build a machine that would allow an inquisitive young mind to explore as much of Maths, Physics and CompSci as they dreamed and dared to do. I have just recently released the InteractivePrimer.com to form the foundation for this. It is a free and open-source repository of all of the concepts in the hard sciences, from early school to completing university, and with a growing number of advanced (MSc-level) topics. Each concept is presented in a bite-sized lesson with interactive diagrams, charts and quizzes, and links back to any prerequisite concepts you might have missed. If you know anyone who is a teacher who might like to help inform its direction, please ask them to get in touch with me. And if you have kids who want an interactive way to improve their hard sciences skills, I would love too to hear their feedback. It is a work in progress, so all feedback is gratefully welcomed. 🙏

A suggestion from a regular user here: add a way to bookmark specific nodes in the knowledge tree with a personal note, so you can mark tricky spots and come back to them later. Would be huge for revisiting weak areas without scrolling through the whole graph.

The animations actually make abstract concepts click for me in a way textbooks never did, and I appreciated not having to create an account just to poke around.

InteractivePrimer.com

Free “smart web pages” that teach maths, compsci & physics.

Free “smart web pages” that teach maths, compsci & physics.