Science
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Cloud Index
A growing photo archive of clouds above power plants and other fossil-fuel emitters, indexed by site, turning each prett…
Cloudline
Naturalists Charlie Russell and Maureen Enns share their years living among wild grizzly bears in Kamchatka, their cub r…
Cloudy Nights
One of the oldest amateur astronomy forums online, covering telescope reviews, observing reports, and astrophotography t…
Clusters
A particle system with emergent behavior where colored species attract and repel each other, with presets and sliders to…
CO2 Levels
An interactive graph of atmospheric carbon dioxide and global temperature, letting you zoom from the recent Mauna Loa re…
Coalition to Ban DHMO
The classic dihydrogen monoxide hoax site, a deadpan campaign against water that has fooled and amused visitors for year…
Cochineal: Mexico's Red
An online exhibit from Harvard Museums of Science and Culture on cochineal, the insect-made red dye of Mexico, tracing i…
Cockatiel Cottage
A deep, long-standing guide to cockatiels covering diet, health, taming, behaviour problems, breeding and hand-feeding,…
Cockeyed
Rob Cockerham's home of oddball experiments: counting how many sheets are really on a roll, elaborate pranks, homemade s…
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…
Coffee Ad Astra
An astrophysicist's coffee blog that applies science to blind tastings, brew methods, grinders, filters, and espresso, w…
Coffeelands
Catholic Relief Services' coffee blog, with articles on climate change, coffee research, farmer organizations, policy, a…
Cognitive Biases
A visual, interactive database of cognitive biases with illustrated cards and short explanations of how the mind tricks…
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…
collectSPACE
A community and forum for space history enthusiasts and collectors, covering astronaut memorabilia, mission artifacts, a…
Color Challenge Hue Test
A free online color vision test where you sort rows of tinted blocks into smooth gradients, then get a score showing how…
Color Controversy
A quirky color-perception project that asks where one color name ends and another begins, collecting votes from visitors…
Color Landform Atlas of the United States
An atlas of shaded-relief landform maps for every US state, color coded by elevation, with county outlines, satellite vi…
Color Precision Test
A color perception test based on CIEDE2000 that measures the smallest color difference you can actually notice and gives…
Color Television NTSC Tutorials
Illustrated tutorials on how analog NTSC color television works, from the antenna and scanning timing to color encoding…
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