Science
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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…
Correlates of War
A long-standing academic data project cataloging wars, alliances, and national capabilities since 1816, widely used in p…
CosmoBC AstroBlog
A blog about astronomy and space exploration with astronomy pictures and articles on astrophysics, the solar system, sta…
Cosmos Magazine
An Australian science magazine delivering accessible news and features on space, nature, physics, and technology from th…
Costa Rica Living and Birding
A blog of information and perspectives on birding in Costa Rica, from a resident birder sharing sightings, local knowled…
Cotswold Diary
A diary of nature recovery and community conservation in the Cotswolds, following wildflower grassland seeding, wildlife…
Courtenay Museum & Paleontology Centre Blog
A museum blog from Vancouver Island covering Cretaceous marine reptile fossils, local natural and cultural history, lect…
Crime Pays But Botany Doesn't
Plant-obsessed botany site with videos, a how-to on taking herbarium specimens, a native plant nursery directory, a bota…
Cryptopals Crypto Challenges
A famous set of forty-eight hands-on programming challenges that teach modern cryptography by having you break real-worl…
CS 189 Introduction to Machine Learning
The public course site for UC Berkeley's introduction to machine learning, with lecture slides, notes, discussion worksh…
CS261: A Second Course in Algorithms
Course page for Tim Roughgarden's Stanford course with lecture notes, problem sets and readings on network flow, linear…
Curiosity Telescope Log
A terminal-styled build log of a hand-made 6 inch Newtonian reflector telescope, covering design, fabrication and learni…
Curtis W. Moore
Artist site mixing paintings with generative and mathematical pieces like Solar Ouruboroi, circTao and Coherenz, plus a…
Cut / Fold Templates
Printable cut-and-fold templates for clever paper mechanisms - flexagons, hexaflexagons, Miura-ori folds, bistable switc…
Cut the Knot
Alexander Bogomolny's encyclopedic collection of interactive math miscellany, with hundreds of proofs, puzzles, and curi…
Cyclostationary Signal Processing
An expert's long-running tutorial blog on the statistics of communication signals, with worked explanations, datasets, p…
Dark Roasted Blend
A long-running blog of the weird and marvelous, with photo-heavy galleries on dangerous roads, steampunk, abandoned plac…
DarkSky International
An advocacy organization fighting light pollution, with maps of certified dark sky places and tips for better backyard s…
Darwin Correspondence Project
A Cambridge University archive of Charles Darwin's letters, with searchable transcripts revealing the development of his…
Darwin Online
A complete digitized archive of Charles Darwin's publications, manuscripts, and notebooks, freely browsable page by page…
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