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arXivFree preprint papers in physics, math, and CS before peer review slows things.
Bartosz CiechanowskiPossibly the best interactive explainers on the web — how gears, light, and sound truly work.
Better ExplainedMath concepts explained with intuition first, formulas second. A relief.
BioInteractiveGorgeous free biology animations and data from HHMI. Classroom-grade, no fluff.
Brilliant (Free)Interactive STEM courses. The free tier covers a lot.
CERNThe world's largest particle physics lab. News, explainers, live detector data.
CitizendiumAn expert-written alternative encyclopedia project.
Complexity ExplorablesPlay with models of how flocks, epidemics, and patterns self-organize.

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