Science
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Butterflies and Moths of North America
A collaborative sightings database mapping butterfly and moth species across North America, contributed by naturalists a…
C.G. Jung and the Red Book
A free series of in-depth audio lectures by Jung scholar Lance Owens on Carl Jung's Red Book, plus talks on Jung, the Gn…
Caffeine Calculator
A calculator that estimates how much of a caffeinated drink is safe for your body weight and how much would be dangerous…
Caffeinspiration
A personal blog about tech, our minds and how things work, with posts that explore the details behind systems and ideas.
Caffenol
Recipes and experiments for developing photographic film with instant coffee, washing soda and vitamin C - plus beer, wi…
Calamities of Nature
A webcomic about science, religion, philosophy, and bacon, with a deep archive of strips that poke fun at physicists, ph…
CalcuLaTeX
A pretty-printing calculator language that runs in the browser, where you write math as plain expressions and see it ren…
Calculating Position from Raw GPS Data
A hands-on walkthrough of how a phone turns satellite signals into a location, working through pseudoranges, orbits and…
Calculus for Beginners and Artists
A free MIT online textbook that teaches calculus gently from numbers and spreadsheets up to derivatives, integrals and d…
Calculus Made Easy
An HTML edition of Silvanus P. Thompson's 1910 classic introduction to calculus, laid out chapter by chapter for reading…
Caleb Charland
Photographer Caleb Charland makes experimental images: light bulbs powered by apples and potatoes, sundial inversions, l…
Calflora
A detailed database mapping where California's native and naturalized plants grow, built from thousands of botanist and…
Calling Bullshit
A free university course on data reasoning, with full syllabus, recorded lectures, tools and case studies teaching you t…
Calling Thunder: Unsung NYC
Immersive 360 videos and soundscapes that contrast the din of modern Manhattan with the wild island of Mannahatta that H…
Callum's Sandbox
A sandbox of WebGL experiments by Callum Prentice, including a 3D globe that animates NOAA storm tracks going back to 18…
Cambrian Explosion
A small browser simulation of evolution that lets you watch simple organisms compete and change over generations, a toy…
Cambridge Digital Library
Cambridge University Library's digital collections, with high-resolution scans of treasures like Isaac Newton's papers,…
Can I Fly a Kite?
A simple site that checks the wind in your area and tells you whether it is strong enough to fly a kite, with a clear ye…
Can You Reverse Engineer Our Neural Network?
Jane Street presents a machine learning puzzle: given a trained network and no documentation, work out what it actually…
Canadian Museum of Nature Science Blog
A science blog from the Canadian Museum of Nature, whose researchers care for 14.6 million specimens and write about fos…
Canadian Space Agency
The official site of Canada's space agency, covering its astronaut corps, robotics contributions, and satellite and scie…
Cancer Currents
The National Cancer Institute's research blog, with news and updates on cancer studies, treatments, and prevention, writ…
Cancer FactFinder
An interactive Harvard site that fact-checks what actually does and does not cause cancer, sorting everyday exposures an…
Candle Flame Oscillations as a Clock
Bundle three candles together and their flames start to pulse in sync; this write-up explores the physics of the flicker…
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