Education
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Programming in the 21st Century
James Hague's classic blog on programming, simplicity and the history of computing, with short, opinionated essays that…
Programming Time
A card game that helps kids learn to read and debug code: players draw a card, read the code, roll a d20 where marked, a…
Progressive Geographies
Geographer Stuart Elden's blog on politics, philosophy, and geography, with notes on books, his own writing, and ideas a…
Project 1917
A day-by-day retelling of the year 1917 through the real diaries, letters and memoirs of people who lived it, from tsars…
Project Euler
A collection of hundreds of challenging mathematical and computer programming problems designed to be solved with clever…
Project GREAT Photo Tour
A photo tour of a family expedition that carried atomic clocks up a mountain to test general relativity, with kids, cool…
Project Gutenberg Australia
A companion library to Project Gutenberg offering free ebooks of titles still under copyright elsewhere but in the publi…
Project Gutenberg Canada
A companion library offering free ebooks of works that are public domain in Canada, including many mid-20th-century titl…
Project Lovelace
A collection of science and math flavored programming problems aimed at beginners, with topics ranging from astronomy an…
Project Resource Map
A free, vetted directory of transportation, housing, meal, and wig resources for cancer patients, caregivers, and famili…
ProjectLearn
A project-based way to learn programming, with guided builds across web, mobile and game development, plus machine learn…
Psych Central
A mental health information site reviewed by clinicians, covering conditions, therapy approaches, and evidence-based cop…
PsychMechanics
A psychology site for readers curious about the nuts and bolts of human behavior, with research-informed articles on emo…
Psychology Tools
A site offering free, evidence-based worksheets and resources drawn from cognitive behavioral therapy and other validate…
Psytrance Guide
A complete, up-to-date guide to psytrance styles that helps you tell subgenres apart, discover new ones and organize DJ…
Pteros
The online museum of pterosaurs, with an illustrated, described entry for every known genus of flying reptile from Aerot…
Pub History Project Leicester
A local history project documenting the pubs of Leicester, with photos, timelines, and stories about the buildings and t…
Public Domain Day
Duke's annual Public Domain Day guide to the books, films, songs and sound recordings that become free for everyone to u…
Pulitzer Prize Winners by Year
A year-by-year archive of Pulitzer Prize winners and finalists across journalism, letters, drama, and music, going back…
Pumora
A hand embroidery resource with over 200 stitch tutorials, plus guides to get beginners started on their stitching journ…
Purple Comet Math Meet
A free international online team math competition whose past problem sets and solutions remain fully accessible, offerin…
Pursuit Magazine
An online magazine written by and for professional investigators and the spy-curious, with articles on investigative cra…
Putting the You in CPU
A free illustrated mini-book explaining what actually happens inside a CPU and operating system when you run a program.
Puzzlecanon
A close look at puzzle canons, the enigmatic riddle-like compositions by Bach and others where the score hides how the m…
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