Education
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Roman Roads
A subway-style transit diagram of the major roads of the Roman Empire, drawn by Alexandr Trubetskoy, with wonderful cart…
Roman Roads Subway Map
A subway-style transit diagram of the major roads of the Roman Empire around 125 AD, with each road drawn as a colored m…
Roman Surveying
How Roman surveyors laid out roads, aqueducts and cities using instruments like the groma and chorobates, drawing on Vit…
Romancing the Data
Data-driven directories for romance readers: bookstores on a map, reader events, podcasts and a best-of-the-best list bu…
Romantic Circles
A scholarly site devoted to Romantic-era literature, with free digital editions, author pages like Mary Shelley's, essay…
Romentis
A series of nonverbal logic puzzles set in ancient Rome, with matrices built from Roman mosaic stones that climb from Ti…
Rosalind
A platform for learning bioinformatics through problem solving, in the spirit of Project Euler, with graded puzzles on D…
Rosetta Code
A programming chrestomathy wiki showing how the same tasks are solved in hundreds of different programming languages sid…
RosettaGit
A community site that presents solutions to the same programming task in as many languages as possible, from FizzBuzz to…
Ross Spiral Curriculum
An interactive spiral timeline of human history and culture, letting you click through eras and civilizations to see how…
Rotations and Balls in Even Dimensions
A math essay on how rotations behave in even dimensions and what that means for the balls they act on, written for reade…
Rotator
A quick browser game that tests your shape rotation skills, challenging you to mentally turn forms and line them up agai…
Roughly
Free daily guessing games where you drag, pull or draw an estimate, then see the real number and how far off you were. N…
Roux Trainers
A collection of browser trainers for the Roux Rubik's Cube method, with drills and case practice for cubers who want to…
Rowing Story
A historical project telling the story of Great Britain's women's international rowing from the first European Champions…
Royal Constellations
A starry network visualization of a thousand years of European royal family ties, where you click two monarchs to trace…
Royal Horticultural Society
The Royal Horticultural Society's advice hub with plant profiles, month-by-month growing guides, and inspiration from th…
Royal Museums Greenwich
The site of the UK's National Maritime Museum, featuring collections on ships, navigation, and seafaring history alongsi…
RoyalUr.net
Play the Royal Game of Ur, a board game over 4500 years old, against friends or a computer, with rules, lessons and clea…
RSC Periodic Table
The Royal Society of Chemistry's interactive periodic table with podcasts, videos, history, and uses for every element,…
RSN Stitchbank
An illustrated library of embroidery stitches from the Royal School of Needlework, showing how each stitch is worked for…
Rubik's Cube Explorer
An interactive 3D Rubik's Cube that greets you in the first person, letting you twist, scramble, and learn how the puzzl…
Rubik's Cube Solver
Paint the colors of your scrambled cube onto an on-screen 3D model and get a step-by-step solution, with solvers for 2x2…
Ruby Basics
A hands-on introduction to Ruby that teaches the language by example, with short lessons and coding challenges you can t…
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