Education
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Archimedes' Cattle Problem
The famous ancient puzzle about the Sun god's cattle in full English statement, with solution pages and history of the e…
Architectuul
A crowd-curated open architecture wiki cataloging buildings, architects, and movements worldwide, from modernist landmar…
Archive of Archives
A curated, filterable collection of digital archives from around the web, from image libraries to oddball collections, a…
Archive of Native American Recorded History
A growing digital archive of recorded oral histories from Indigenous communities, preserving languages, stories, and liv…
ArchNet
An MIT-hosted digital library documenting Islamic architecture and historic sites across centuries, from mosques to cara…
Arduino - Home
The official site for Arduino, an open-source electronics platform of microcontroller boards and software for building i…
Arduino Project Hub
Arduino's official showcase of community-submitted microcontroller projects, each with wiring diagrams, code, and step-b…
ArduPilot
The home of the open-source autopilot software project, offering documentation and forums for hobbyists building drones…
Arendt Speaks of Oases (In Praise of Oases)
An essay on Hannah Arendt's image of the oasis as a refuge that protects our self-understanding from the pressure to adj…
ARETE
A Visual History of the Latin Alphabet: an interactive timeline from FH Potsdam's UCLAB tracing how letterforms evolved…
Argo Program
Scripps Institution of Oceanography's public page on the global fleet of robotic floats that continuously measure ocean…
Aristotl
A quick lookup tool for logical fallacies, so you can search or browse named reasoning errors and spot ad hominem, straw…
Armillary sphere
The Oxford History of Science Museum explains the armillary sphere, the ring-based model of the heavens, how its circles…
Armored Penguin Puzzle Generator
A free toolkit for generating custom cipher puzzles, word searches, crosswords, and cryptograms from your own text, read…
Army Talk Orientation Fact Sheet #64: Fascism!
The text of a 1945 US War Department discussion guide for soldiers explaining what fascism is, how it gains power and ho…
Arnold Arboretum
Harvard's public tree research collection, sharing plant records, seasonal highlights, and articles on the science of tr…
Arnold Zwicky's Blog
A prolific linguist's personal blog mixing syntax analysis, usage commentary, and playful notes on English grammar and v…
Art for Kids Hub
A family art site with step-by-step drawing lessons and craft projects for kids, plus tips for parents and teachers who…
Art Gallery of Ballarat
One of Australia's oldest regional art museums, with a searchable online collection, current exhibitions and behind-the-…
Art History News
Art historian Bendor Grosvenor's blog covering art history stories, from auction-room discoveries and attributions to di…
Art History Teaching Resources
A peer-populated collection of resources for art history teachers, with lesson plans, images, readings and teaching idea…
Art Institute of Chicago
The Art Institute of Chicago's website with a beautifully designed online collection of over 100,000 artworks available…
Art Links
A weekly puzzle game from The Metropolitan Museum of Art where you build chains between artworks by spotting what they s…
Art of Memory
A wiki and forum devoted to memory techniques like the method of loci, with guides, competitions, and a community built…
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