Science
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Candle Flicker LEDs With a Built-in Timer
A teardown of the tiny chips inside candle-flicker LEDs, showing how a cheap integrated circuit mimics a real flame and…
CantoVario
An experiment that uses chaos theory to automatically modify existing music, producing variations of melodies you alread…
CanvasMol
An interactive 3D molecule viewer built on HTML5 canvas that opens PDB, MOL, and SDF files so you can rotate and inspect…
Capture the Atlas
Photography guides and galleries devoted to shooting the Milky Way, meteor showers, and other astrophotography subjects…
Capturing Ecology 2025
The winning images from the British Ecological Society's 2025 nature photography competition, showing animals, plants an…
Carbon Brief
A UK-based site covering climate science and energy policy with data-driven articles, in-depth explainers, and interacti…
Carbon Counter
An MIT-built tool that plots cars by emissions and cost against climate targets, so you can compare models side by side…
Carbon Mapper
A nonprofit mapping platform that uses satellite data to visualize methane and CO2 emission plumes from facilities aroun…
Cargo Airships Could Be Big
An argument that modern cargo airships could reshape global freight, covering the economics, engineering and regulatory…
Casebooks
Cambridge's digital edition of the casebooks of Simon Forman and Richard Napier, 17th-century astrologer-physicians, wit…
Casio F-91W Die-Shot
A microscope die-shot of the chip inside the iconic Casio F-91W quartz watch, with annotated images showing what makes t…
Cat Fansite
A cute fan site devoted to cats, with pages on cat care, how coat colours, dilution and white spotting are inherited, ca…
Cat Tracker
A citizen science project that strapped GPS trackers on pet cats and maps where they really go at night, with browsable…
Cataclysmic 1991 Eruption of Mount Pinatubo
A USGS fact sheet on the 1991 Mount Pinatubo eruption, the second-largest of the century, covering the evacuation, ash,…
Category Theory Illustrated
An illustrated, friendly introduction to category theory that starts from sets and builds up with diagrams and plain-lan…
Cateno
A cause-and-effect history explorer that lets you follow chains of causes and consequences across scenarios, like the vo…
Caustic
An artsy interactive fluid simulation built on self-devised algorithms, where you stir the fluid with your mouse and wat…
Cave Paintings of Mushrooms
Mycologist Brian Akers examines a prehistoric painting in the Selva Pascuala rock shelter in Spain that may show psilocy…
Celestial
An interactive gravity well simulator where star systems bend a spacetime sheet; change gravity, push a planet or drop i…
CelesTrak
Dr. T.S. Kelso's long-running reference site providing orbital element data and technical resources for satellite tracki…
CellCulTuring
Pong implemented entirely as a cellular automaton, where simple local rules on a grid of cells produce the ball, the pad…
Cellular Automata Playground
Design your own cellular automaton rules, then start, pause or step the grid to watch patterns grow, with ready-made exa…
Centauri Dreams
A scientifically rigorous blog exploring interstellar travel concepts, exoplanet research, and the long-term future of d…
Center for Humans and Nature
A nonprofit that publishes essays, poems and the Minding Nature journal exploring how people relate to the living world,…
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