Education
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Ain't it funny how the knight moves?
A chess exercise that trains board vision by drilling how the knight moves across the squares, with quick puzzles to get…
Airminded
A history blog on airpower and British society from 1908 to 1941, exploring how aviation shaped fears, politics, and cul…
AJPS Author Summaries
Plain-language summaries written by the authors of American Journal of Political Science papers, explaining new research…
Alaska Volcano Observatory
A scientific monitoring agency's public site tracking Alaska's volcanoes with live webcams, ash advisories, and current…
Alberto Chueca Chess Blog
A chess blog by International Master Alberto Chueca with free articles on openings, middlegames, endgames, and the lates…
Alcohol Professor
A beverage education blog covering wine, beer, spirits, cocktails, and drink culture, pitched as the class you always wa…
Alex Colville
Official site of Canadian painter Alex Colville, known for his eerie, meticulous realist scenes, with a gallery of his w…
Alexandria: The City and the Library
Walk the streets of Alexandria around 250 BCE, read ancient works in the Library, hear an optional guided tour and explo…
Algebra Rules
A reference of the basic rules of algebra, each with a plain explanation and worked examples, covering arithmetic, expon…
Algodoo
A free 2D physics sandbox where you draw shapes, springs, gears and water and watch them come alive, popular with kids a…
Algorithms Books
Three MIT Press textbooks by Mykel Kochenderfer and coauthors on optimization, decision making and validation, with full…
Algorithms by Jeff Erickson
A free algorithms textbook and course archive from Jeff Erickson at the University of Illinois, with lecture notes, home…
Algoviz
An interactive A* pathfinding visualization where you watch the algorithm search a grid step by step to find the shortes…
Ali9n
A daily logic puzzle where you get all the numbers to be equal in as few moves as possible, with a fresh grid to solve e…
Alice A. Ball Is Hidden in History
The story of Alice Ball, the young University of Hawaii chemist who developed the first effective treatment for leprosy…
Alison
A free online learning platform with a large catalogue of courses in business, tech, languages, and health that you can…
All About Birds
The Cornell Lab of Ornithology's free guide to North American birds, with photographs, songs, identification tips, and l…
All About Circuits
A large electronics community with articles, tutorials, textbooks, and forums covering circuit design and electrical eng…
All About Earth's Gravity
A Physics Forums Insights article explaining Earth's surface gravity of about 9.8 meters per second squared and how the…
All About Forensic Psychology Blog
A blog on forensic psychology issues, news and resources, aimed at anyone curious about how psychology meets crime and t…
All Ears English
An English-learning podcast and site where two native American speakers teach real conversational English, with lessons…
All of Physics in 9 Lines
A bold one-page table that condenses all known physics, from relativity to quantum theory, into nine short lines, part o…
All That Map
An interactive world map and data tool presenting topics such as life expectancy, economy, health, and population throug…
All That Philly Jazz
A public history project on Philadelphia jazz that draws on archival materials and oral histories to cover clubs, musici…
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