Education
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Puzzled Pint
The archive of a free monthly in-person puzzle hunt held in cities worldwide, with every past month's cooperative logic…
Puzzlewocky: Situation Puzzles
A curated set of lateral-thinking situation puzzles, the kind solved by asking yes-or-no questions, presented with clear…
Puzzling Stack Exchange
A question-and-answer community where thousands of original logic puzzles, riddles, and lateral-thinking brain teasers a…
pwn.college
A hands-on cybersecurity education platform with lectures and practice challenges that teach hacking skills from the bas…
Pytheas Center for Contemporary Music
A web nexus for modern non-pop art music, with composer profiles, ensembles, performance listings and resources for expl…
Python Data Science Handbook
The full text of Jake VanderPlas's handbook, with Jupyter notebooks on IPython, NumPy, Pandas, Matplotlib, and Scikit-Le…
Python for Everybody
A free course for learning Python from scratch, with lessons, exercises, and materials that take beginners from basic sy…
Quant Riddles With Answers
A big collection of logic, probability and lateral-thinking brain teasers with worked answers, originally gathered for j…
Quantum Country
An experimental textbook on quantum computing by Andy Matuschak and Michael Nielsen that embeds spaced-repetition flashc…
Quantum Frontiers
A blog by Caltech's Institute for Quantum Information and Matter on advances in quantum physics and information, written…
Queen Songs
A detailed reference on the writing and recording of every Queen song, with album data, instrumental guides and notes on…
Queensland Museum
Queensland's state museum of natural and cultural heritage, with collections and research pages, learning resources and…
quikscript.net
An enthusiast's home for Quikscript, the 1950s phonetic alphabet for English by Kingsley Read, with sample text, the ori…
QuizMathGenius
A free algebra practice site with question sets on linear equations, substitution, elimination, and graphing, plus print…
Quote Investigator
Garson O'Toole traces who really said famous quotations, with carefully researched articles that follow a saying back th…
Quran.com
A reader for the Quran in Arabic with translations in many languages, word-by-word study, tafsir, audio recitations and…
R for Data Science
A free online book that teaches data science with R, covering how to import, tidy, transform, visualize and model data u…
Rabbit Waves
A hand-lettered, illustrated guide to flag semaphore and international maritime signal flags, with each letter drawn out…
Radiopaedia
A free, collaborative radiology reference with thousands of annotated X-ray, CT, and MRI cases contributed by physicians…
Radzyn
A collection of fictional short stories about a real town in the Polish forests, where Jews fleeing Europe's darkest yea…
Raindance
The site of a long-running independent film festival and training organization, publishing resources and news for indie…
Ran Art Blog
A drawing and painting blog from an art instructor, with tutorials for every level, supply reviews, galleries and featur…
Random Facts Generator
A large collection of bite-sized random trivia facts, refreshed and reshuffled for a quick hit of odd knowledge on any v…
Random Language Poetry
Poems composed from the sound of random words in languages the author does not know, from Spanish to Latin, each in a di…
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