Education
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100 Ways To Live Better
A hundred bite-sized pieces of life advice crowdsourced and sharpened from a viral thread, covering habits, money, relat…
100 Years to Solve an Integral
The surprising history of the Mercator map and the integral of sec(x), a calculus staple that stumped mathematicians for…
100,000 Stars
An interactive 3D map of the stellar neighborhood showing over 100,000 nearby stars colored by temperature, which you ca…
1000 Years
An interactive map quiz where you travel through history by guessing the year of key events, people and places for each…
1000-Word Philosophy
An anthology of introductory philosophy essays, each explaining one big question such as free will or justice in a thous…
10FastFingers
A typing speed test that measures words per minute against a language-specific word list, with competitive leaderboards…
11v11
A football statistics archive with head-to-head records, historical line-ups, and results covering more than a century o…
12 Ancient Greek Terms that Should Totally Make a Comeback
A tour of twelve ancient Greek words like eudaimonia and arete, explaining what each meant and why modern life could use…
12 Months of Mandarin
A learner documents twelve months of studying Mandarin Chinese, with hours logged, methods tried and an honest look at w…
120 Years of Electronic Music
A chronological archive exploring the instruments that shaped electronic music, from the 1876 Musical Telegraph to moder…
13 Ghost Towns in Greenland
A tour of 13 abandoned settlements in Greenland, from mining towns to old trading posts, explaining why each was left be…
1504 Da Vinci Globe
A zoomable flat projection of the 1504 ostrich egg globe linked to Leonardo da Vinci, one of the oldest globes showing t…
1600.lol
A free SAT prep site with targeted question practice, timed practice-test modes, score-planning tools and reviewed study…
16Personalities
A free, detailed Myers-Briggs-style personality test that produces an in-depth report on your strengths, relationships,…
1922: Why I Quit Being So Accommodating
A complete transcription of an oddly modern 1922 American Magazine essay in which an anonymous writer explains why he st…
1940s NYC
An interactive map with street photos of nearly every building in New York City from 1939 and 1940, so you can walk any…
1950 Census
The National Archives site for the 1950 US census, where you can search names and browse the original handwritten popula…
20 Chemical Reaction GIFs
A gallery of 20 animated GIFs showing strange and mesmerizing chemical reactions, from simple elements behaving in surpr…
20 Rules of Knowledge Formulation
Dr Piotr Wozniak's widely cited guide on how to write effective flashcards, covering simplicity, context and redundancy…
2012 Book Archive
An archive of openly licensed college textbooks from 2012 spanning business, science, and the humanities, free to read o…
20LY
A browser-based 3D star atlas of our local stellar neighborhood that lets you fly between nearby stars, filter by spectr…
21 Hours on the Moon
Relive the 21 hours Armstrong and Aldrin spent on the lunar surface during Apollo 11 through panoramas, photo galleries,…
227th Assault Helicopter Battalion
A veteran-built history site for the 227th Assault Helicopter Battalion, 1st Cavalry Division (Airmobile), with company…
25 Years of Wikipedia
A celebration of Wikipedia's 25th anniversary, collecting milestones, stories and reflections on how a volunteer-written…
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