Education
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Quant Riddles With Answers
A big collection of logic, probability and lateral-thinking brain teasers with worked answers, originally gathered for j…
Quantic Foundry
A player-motivation research blog analyzing survey data from millions of gamers to explain why different audiences enjoy…
Quantization From the Ground Up
A visual, interactive guide to how language models store numbers as floats and why squeezing them to 4 or 8 bits barely…
Quantum Canvas
An interactive 3D visualization of a qubit with real-time noise simulation, showing how errors disturb the state of a qu…
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…
Quantum Roulette and the Nature of Reality
An interactive exploration of Bell's theorem, the strangest result in quantum physics, built around a roulette game that…
Quark!
A Wordle variant that uses high-school level physics terms as the answers, with each guess teaching you a little vocabul…
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…
Quest at the Museum
A free, self-led live-action Dungeons and Dragons adventure for London's Natural History Museum, with riddles, dragons a…
Queueing: An Interactive Study of Queueing Strategies
A visual, interactive essay on how FIFO, LIFO, priority queues and other strategies behave when a server is flooded with…
Quicksort Explained IKEA-Style
A wordless, flat-pack-furniture-style instruction sheet that teaches how quicksort works, part of a series of nonverbal…
quikscript.net
An enthusiast's home for Quikscript, the 1950s phonetic alphabet for English by Kingsley Read, with sample text, the ori…
quipqiup
A free cryptogram-solving playground that lets you decode substitution-cipher quotes yourself or watch an automatic solv…
Quiver and Fixity
An essay by Jhumpa Lahiri on returning to Thomas Hardy's Jude the Obscure decades later and finding wells, ghosts, and t…
Quiz Bowl Packets
A freely browsable archive of thousands of academic quiz bowl question packets, covering literature, science, and histor…
QuizMathGenius
A free algebra practice site with question sets on linear equations, substitution, elimination, and graphing, plus print…
Quizzity
A geography game where you pin the location of several cities on a world map and earn points for being both accurate and…
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…
R2D3
A scrollytelling visual essay that teaches how machine learning decision trees work through animated, step-by-step inter…
Rabbit Waves
A hand-lettered, illustrated guide to flag semaphore and international maritime signal flags, with each letter drawn out…
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