Science
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Constellation Photos
A deep photographic guide to the constellations, showing the whole night sky in richly exposed color images arranged by…
Construction Physics
Brian Potter's newsletter investigating why buildings, infrastructure, and manufacturing cost what they do, one deeply r…
Contour Guesser
A daily map puzzle where you try to work out where in the world you are standing from nothing but a contour map. Plays i…
Conversion Calculator
A unit converter covering acceleration, energy, length, mass and more, with oddities like barleycorns, cable lengths and…
Convert to Bananas
A silly unit converter that expresses any length or distance in bananas alongside conventional units, answering how many…
ConvNetJS
A JavaScript library with live demos that train neural networks right in your browser, including image classifiers, regr…
Convolutions, Fast Fourier Transform and Polynomials
A friendly explainer showing how multiplying polynomials connects to convolutions and the fast Fourier transform, built…
Conway's Doomsday Rule
An illustrated guide to mentally working out the weekday of any date with Conway's Doomsday rule, plus practice exercise…
Conway's Game of Life
A clean, playable Conway's Game of Life with a built-in Life Lexicon of famous patterns: draw cells, load gliders and gu…
Conway's Gradient of Life
A short, playful explainer showing how to run Conway's Game of Life backwards with differentiable automata, so that a ch…
Conway's Webcam of Life
Your webcam image becomes the seed for Conway's Game of Life, so your face dissolves into blinking, gliding cells - with…
Copernicus Browser
A browser for Sentinel satellite imagery from all Copernicus missions, where you zoom into any area of Earth, pick a dat…
Copper Sushi
A pretty map of the European electrical transmission network, drawn as glowing dots and lines, with an explanation of wh…
Coral Reef Alliance
A conservation nonprofit working to protect coral reefs, sharing science-based stories on reef ecology and restoration e…
CoralWatch
A citizen-science project from the University of Queensland that trains snorkelers and divers to monitor coral bleaching…
CORE
The world's largest collection of open access research papers, with over 200 million papers you can search and read free…
Cornell University Library Online Exhibitions
Dozens of online exhibitions from Cornell's library, covering topics like bird extinction, glacial science, women botani…
Corpus Delicti: the Doctor as Detective
A Harvard online exhibition on the birth of forensic medicine, telling the story of its Department of Legal Medicine and…
Corpus of Contemporary American English
A massive searchable database of over a billion words of real American English, letting users see how words and phrases…
Correlates of War
A long-standing academic data project cataloging wars, alliances, and national capabilities since 1816, widely used in p…
Cosmic Microwave Background Radiation
A clear primer on the cosmic microwave background, explaining what cosmology studies and how this leftover glow reveals…
Cosmic Odometer
A calculator that estimates how far you have traveled through space since birth, adding up Earth's spin, its orbit and t…
Cosmic Odometer
Calculates how far you have traveled through the universe since birth, using real physics data for Earth's motion, the s…
Cosmic View: The Universe in 40 Jumps
A page-by-page online copy of Kees Boeke's 1957 book Cosmic View, which zooms from a girl in a chair out to the edge of…
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