Education
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Related Words
A word-finding tool that returns terms related to any word or phrase, ranked by how closely they connect, handy for writ…
Relativistic Spaceship
An interactive special relativity simulator where you accelerate a spaceship toward light speed and watch time dilation,…
Relativity Park
A special relativity simulator where light crawls at walking speed, so you can see Lorentz contraction, aberration, and…
RepView US
A lookup tool for US House members that shows voting records and activity, searchable by ZIP code or member name, for ch…
Reverse Dictionary
A reverse dictionary where you describe a concept in your own words and get back the words that best fit, handy for the…
Rewordify
Paste in difficult text and it replaces hard words with simpler ones, helping you read more, understand better and learn…
Rhyme It
A rhyme finder for songwriters and poets that returns perfect and near rhymes for any word, grouped by syllable count so…
Rhymer.com
An online rhyming dictionary that finds words that rhyme with whatever you type, a handy companion for poets, songwriter…
River Runner Global
Click anywhere in the world and watch the path a raindrop would follow, tracing rivers downhill to the sea on an animate…
Roadwright
Draw any wheel shape and see the exact road it needs to roll along with its axle perfectly level. A square rolls smoothl…
Roadwright
Draw any wheel shape and Roadwright computes the road it can roll along with its axle perfectly level, from a square on…
Robotics101
A set of interactive visual tools for learning key robotics concepts such as translation and rotation, so you can see th…
Rock 'n Poll
An interactive explanation of why political poll results deserve a grain of salt, letting you play with samples and marg…
Roman Name Attestations
A map of people who lived in the Roman Empire, built from attested names so you can see where individuals were recorded…
Rosalind
A platform for learning bioinformatics through problem solving, in the spirit of Project Euler, with graded puzzles on D…
Ross Spiral Curriculum
An interactive spiral timeline of human history and culture, letting you click through eras and civilizations to see how…
Roux Trainers
A collection of browser trainers for the Roux Rubik's Cube method, with drills and case practice for cubers who want to…
Royal Constellations
A starry network visualization of a thousand years of European royal family ties, where you click two monarchs to trace…
RSC Periodic Table
The Royal Society of Chemistry's interactive periodic table with podcasts, videos, history, and uses for every element,…
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…
RunJS Playground
An online JavaScript playground that runs your code instantly with live feedback, handy for learning the language and pr…
Running Reality
An interactive world map you can scrub through 5,500 years of history, watching borders, cities, and empires shift year…
Russian Pantheon
An interactive 3D tour of the Millennium of Russia monument in Veliky Novgorod, where you click each of its bronze figur…
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