Science
Science sites worth your time, kept by hand. No algorithm, no tracking.
- 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.
- Complexity ExplorerFree courses on complexity science, chaos theory, and emergence.
- Crash Course ScienceFree video courses on every science topic from biology to astronomy.
- Deep SeaScroll down through the ocean and meet what lives at every crushing depth.
- Desmos ArtAstonishing pictures drawn entirely from graphed equations. Math as canvas.
- Dollar StreetSee how families at every income level worldwide actually live, in photos.
- Earth ObservatoryNASA's satellite images and science about our changing planet.
- Engineering ExplainedHow engines, cars, and machines work, broken down clearly.
- Explorable ExplanationsA hub for playable posts that teach by letting you tinker. A whole movement.
- FolditA puzzle game where folding proteins well actually advances real science.
- GapminderHans Rosling’s tools for seeing the world as it really is, through data.
- GeoGebraDynamic math visualization for geometry, algebra, and calculus.
- How It’s Made ArchiveThe meditative joy of watching ordinary things get manufactured.
- How Stuff WorksClear answers to how just about everything actually works.
- Immersive MathLinear algebra with interactive 3D figures. The best linear algebra resource.
- Math is FunClear explanations of every math concept from arithmetic to calculus.
- MathigonAn interactive textbook that turns learning math into genuine exploration.
- MIT OpenCourseWareMIT's full course materials online, free. The real syllabus.
- Nature.comOne of the world's most prestigious science journals. Some free articles.
- NautilusScience storytelling connecting ideas across wildly different fields.
- New ScientistLively science news from particle physics to psychology.
- NRICH MathMath enrichment from Cambridge. Challenging problems for all ages.
- NumberphileVideos about numbers and math from Brady Haran. Oddly compelling every time.
- OEISThe Encyclopedia of Integer Sequences. Type a few numbers, find their secret name.
- OpenLearnFree university-level courses from the Open University. Thousands of them.
- OpenStaxFree peer-reviewed college textbooks. Physics, chemistry, biology, stats.
- Optical IllusionsA scholarly but delightful catalogue of how your eyes deceive you.
- Our World in DataGlobal data on health, poverty, and the environment. Sourceable and honest.
- Papers With CodeMachine learning papers with working code attached. The state of the art, live.
- Periodic Table (RSC)Interactive periodic table from the Royal Society of Chemistry. Click any element.
- PhET SimulationsInteractive physics, chemistry, and math simulations from U of Colorado.
- Phys.orgScience news without the oversimplification. New research for curious people.
- Popular ScienceTechnology and science made accessible. Has been at it since 1872.
- Practical EngineeringWhy bridges, dams, and infrastructure work — and sometimes fail.
- Quanta MagazineDeeply reported science journalism on math, physics, and biology.
- Quantum GameLearn quantum mechanics by routing photons through puzzles. Genuinely clever.
- ScholarpediaWikipedia but written by domain experts and peer-reviewed.
- Science DailyNew research summaries from universities worldwide, posted every day.
- Scientific American175 years of science journalism. Some of the best long-form writing available.
- Seeing TheoryProbability and statistics visualized beautifully. From Brown University.
- Setosa Visual ExplanationsInteractive explainers that make hard ideas obvious. Markov chains, eigenvectors, more.
- Steve MouldGenuinely surprising physics demos from a delightfully curious presenter.
- The Birthday ParadoxAn interactive proof of why a room of 23 probably shares a birthday.
- The Scale of the Universe 2Slide from the smallest known thing to the largest. It recalibrates your brain.
- Visual Complex AnalysisComplex analysis as interactive visual art. Stunning and educational.
- Waitbutwhy PostsThe full archive of those enormous, funny, mind-expanding explainers.
- Wolfram DemonstrationsThousands of interactive math and science toys you can poke at directly.
- Wolfram MathWorldThe most comprehensive math encyclopedia on the internet.
- WorldometerReal-time global statistics on population, energy, and health.
- ZooniverseClassify galaxies, count penguins, transcribe old documents. Real citizen science.
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