Education
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52 Things I Learned in 2025
Kent Hendricks' yearly list of 52 surprising things he learned, from odd science findings to quirks of history and human…
52Kards
A resource for students of magic, with free videos and articles that teach card handling skills, sleights and tricks for…
555 Timer Circuits
A hobbyist reference to the classic 555 timer chip, with lessons on how it works and more than 80 buildable circuits lik…
6.191 Computation Structures
The MIT course site for Computation Structures, formerly 6.004, covering digital systems, computer architecture and the…
6.824 Distributed Systems, Spring 2014
The MIT 6.824 distributed systems course site from Spring 2014, with the lecture schedule, readings on classic systems p…
6.828 Operating System Engineering (Fall 2014)
MIT's Operating System Engineering course from Fall 2014, with lecture notes, readings, and hands-on kernel labs that te…
65 Words
A language practice site where you write 65 words a day in the language you are learning to build vocabulary and grammar…
6502.org
A long-running reference site for the MOS 6502 microprocessor, with datasheets, assembly tutorials, and homebrew compute…
677 Novels Worth Arguing About
An interactive explorer of every one of the 677 novels named by 172 voters in the Guardian's top 100 books poll, searcha…
7 Sets Venn Diagram
An interactive Venn diagram of seven overlapping sets from data artist Santiago Ortiz, built to show every intersection…
7000 Languages
A nonprofit building free online courses for endangered and under-resourced languages in partnership with the communitie…
7GUIs
The seven classic 7GUIs tasks, from a counter to a spreadsheet, implemented in vanilla HTML, CSS, and JavaScript so you…
80,000 Hours
A research nonprofit publishing in-depth guides on choosing a career that does the most good, grounded in effective altr…
84000
A nonprofit project making the Tibetan Buddhist canon freely available as readable English translations, with a growing…
88-108 MHz
A hobbyist reference to FM broadcast antennas, listing models from Antennacraft, Channel Master, Finco and more with per…
8notes
A sheet music site combining free scores with lessons and exercises across genres, aimed at beginner and intermediate pl…
9.11 The Human Brain
Free lecture videos from Nancy Kanwisher's MIT course on the human brain, covering face perception, navigation, language…
9/11 Memorial & Museum
The official memorial and museum for the September 11 attacks, sharing survivor stories, artifacts, and the day's timeli…
911realtime
An archive that syncs news broadcasts, radio and other media from September 11, 2001 to the clock so you can follow the…
911Tabs
A search engine for guitar, bass, drum, and piano tabs and chords that indexes millions of tabs across the web, handy wh…
99% Invisible
Stories about the unnoticed design and architecture that shape the world around us.
A Beginner's Guide to Basic Urdu Grammar
An introductory guide to Urdu grammar rules for beginners, covering the basics of sentence structure and word forms to g…
A Beginner's Guide to Cantonese Grammar
A structured set of lessons on Cantonese grammar for beginners, written by Jason Tang, explaining how sentences work in…
A Beginner's Guide to Making Beautiful Slides
Ines Montani shares her practical tips and three beginner-friendly steps for designing clear, attractive talk slides, wi…
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