Education
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Cockney Rhyming Slang
A big dictionary of cockney rhyming slang you can browse from slang to English or English to slang, with entries rated b…
Code Words
A quarterly publication from the Recurse Center with thoughtful long-form essays on programming, from language design to…
Code Your Own Flappy Bird
A Code.org tutorial level where you write blocks of code to build your own Flappy Bird game, a gentle way to learn progr…
CodeCombat
A programming game where you write real Python and JavaScript to guide a hero through levels, learning to code by solvin…
Codeforces
A competitive programming platform hosting regular contests, a huge archive of algorithm problems and an active communit…
Codeforwin
A coding guidebook for C programming, data structures and algorithms, with tutorials, exercises and worked examples for…
Codeguppy
A free coding platform for middle and high school students with JavaScript and p5.js projects, tutorials, and resources…
Codepip
A set of games that teach CSS and coding through play, including Flexbox Froggy, Grid Garden, Code Crunchers and Querymo…
Codes and Ciphers
A history site built by codebreaker Tony Sale, documenting the Enigma machine and the wartime cryptanalysis work at Blet…
Codex Atlanticus
The Biblioteca Ambrosiana's fully digitized Codex Atlanticus, the largest collection of Leonardo da Vinci's notebooks, f…
Codex Atlanticus
A digital edition of Leonardo da Vinci's Codex Atlanticus from the Biblioteca Ambrosiana, letting you browse his sketche…
Codigo
A repository of programming languages where you can browse trending languages, read details with code examples, compare…
Coding Blocks
A podcast and site for becoming a better software developer, covering programming practices, design patterns, performanc…
Cognitive Biases
A visual, interactive database of cognitive biases with illustrated cards and short explanations of how the mind tricks…
Cognitive Fun!
A free collection of browser-based cognitive psychology test games measuring attention, memory, and reaction time, built…
Cognitive Neuroscience Society Blog
The Cognitive Neuroscience Society's blog, covering conference and journal news in brain and mind research, including in…
Cognitive Science Society Blog
A blog that summarizes academic cognitive science research papers in plain language to bridge the gap between researcher…
colah's blog
The visual essay blog of researcher Chris Olah, using interactive diagrams to explain neural networks, topology, and how…
Cold Takes
A blog by Holden Karnofsky with essays on the long-run future, artificial intelligence, and how to think clearly about b…
Cold War Connecticut: AT&T Cheshire Underground Site
Photos and history of AT&T's hardened underground Long Lines facility in Cheshire, CT, part of a wider archive of Cold W…
Cold War Nike-Hercules Air Defenses of Alaska
An index of pages preserving the twenty-year history of the Nike-Hercules missile air defense sites around Anchorage and…
Collected Advice on Research and Writing
A long-lived collection of links with advice on doing research and communicating well, from writing papers to giving tal…
Collected Works of Damon Runyon
A Neocities archive of Damon Runyon's Broadway short stories, full of gamblers, dames and Prohibition-era slang told in…
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Collective Nouns for Humans in the Wild
A short piece of flash fiction by Kathy Fish that invents collective nouns for people, a tapestry of grandmothers, a jub…
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