Actually learn something

A quantum computing textbook with spaced repetition built into the page, so what you read has a chance of staying.

Four Wordle grids solved at the same time with nine shared guesses, which is exactly as stressful as that sounds.

The obsessive's music database, where every release is rated, charted and argued over by people with extremely firm opinions.

A snarkier reference work covering pseudoscience, conspiracy theories and the people making a living from them.

Every train on the British network with the signalling data attached: which loop it was held in, where it lost four minutes and why.

David Byrne's magazine about things that are demonstrably working somewhere, reported at length rather than as a listicle.

Amit Patel's tutorials on pathfinding, hexagonal grids and noise, with every parameter exposed as a slider you can ruin.

A Wikipedia article with every meaningful word blacked out; guess words to reveal them until you can name the subject.

Wathan and Schoger's rules for making things look designed when you are not, in fact, a designer.

Reaction time, visual memory, number span and typing speed, each scored against everyone else who has taken it.

Builds a regular expression while explaining every token in a side panel and highlighting matches as you type. Ends a lot of guessing.

Roguelike tower defence where you lay the map down as you go, and every tile placed narrows the next decision.

Archive of notable animation cuts, tagged by the individual animator who drew them. Studying the craft one sequence at a time.

Daily gag strips about science, philosophy and human awfulness, each hiding an extra panel behind the red button.

Drag one slider from quantum foam to the cosmic web, with every object in between labelled at its true size.

Find one to twenty-five scattered across a grid, in order, against the clock. The standard peripheral-vision and attention drill.

Collaborative fiction dressed as containment paperwork for anomalous objects, written by thousands of people in one clinical deadpan.

Converts your scrolling into real distance and tells you what you have just passed — a giraffe, the Eiffel Tower, low Earth orbit.

Indexes only independent personal websites whose owners submitted them. No content farms, because there is nothing there to farm.

You are a colony ship AI choosing which disasters to absorb, and every run ends with a summary of how badly humanity settled.

Brown University's visual introduction to probability and statistics, one animated chapter per concept.

The original semantic-distance guessing game, noticeably harder than its descendants and considerably more humbling.

Word association against a machine: type anything semantically close to the target and the block clears. Tetris rules, meaning as the mechanic.

Raw Sentinel and Landsat imagery for anywhere on the planet, free, with band combinations that reveal crops, floods and old burn scars.

Recipes that explain the science first and then tell you what to do. The food-lab pieces are why it has the reputation it has.

Short visual explanations of statistics ideas — eigenvectors, conditional probability, Markov chains — all draggable.

Thousands of full-screen graphics experiments, each one a few hundred lines of maths you can read and edit live.

Drag the control points of a letter back into shape. Your score is how far off the real typeface you landed.

A full year of merchant shipping movements animated on one dark globe and split by cargo type, which turns global trade into a visible swarm.

Search engine for internet-connected devices rather than pages: webcams, routers and industrial kit nobody meant to publish.

Editorially curated short films, each with a proper write-up explaining why it was chosen, which is why the hit rate stays high.

A persistent economic simulation where thousands of players genuinely supply each other, so prices move for real reasons.

Forty logic puzzles on one page, each generated fresh and each solvable by pure reasoning. The interface is ancient and it does not matter.

Enter any two articles and get every shortest path of links between them, drawn as a graph you can drag.

The world's largest supplier of real and replica skulls, browsable by species, which is educational and mildly alarming in equal parts.

The original rumour desk, still patiently establishing whether the thing your uncle forwarded actually happened.

Push crates into place in rooms built to punish the obvious first move, with thousands of community-made levels behind them.

The newsroom that trains other newsrooms to cover responses instead of problems, with a searchable tracker of the results.

Solar flares, sunspot counts and geomagnetic storm levels in real time, plus the aurora forecast that decides whether tonight is worth the drive.

Code typing drills across a dozen languages, where the indentation is handled for you and the punctuation certainly is not.

Seven letters, one compulsory centre letter, and the long climb from Solid to Genius. Ruins mornings extremely productively.

A hundred billion dollars and a shopping list running from Big Macs to aircraft carriers, and it is harder to spend than you expect.

Hundreds of thousands of user-made timed quizzes: name every element, every country, every Friends character. The genre's warehouse.

A daily letter grid with dozens of words buried in it, plus a bonus list that runs on far longer than anyone expects.

Constructive journalism collected from other outlets into one free feed, so somebody else does all the sifting.

Grades any public HTTPS server from A+ down to F and explains every single deduction. The reference test the whole industry quotes.

Curated collections around specific research subjects, preserved because a university decided they would matter later.

Ask a sports question in plain English and get the actual numbers back with a chart. Ends pub arguments in about four seconds.