An instrument, not an article: a Planck-law incandescence engine, an emission-spectrum bench for the flame's second light, and a live Saha plot that settles the plasma question. Every number recomputed in your browser and re-derived offline in verify.mjs, 21/21 assertions passing.

Herd immunity is where an epidemic peaks, not where it stops. The overshoot, playable, and the 1906 Bombay plague table behind the famous fitted curve.

Why did the Quebec Bridge collapse? The 1908 Royal Commission report's figures, read from the page images: the bent chord, the lattice rivets, the dead load nobody recomputed.

Where did Shackleton's Endurance sink? Worsley's log re-added, the drift carried back, the clock corrected, and the predictions made before the find scored.

Galileo's two lectures on the shape and size of Dante's Inferno, redone as arithmetic, and his square-cube mistake, fifty years before Two New Sciences.

How does a whispering gallery work? Airy said the dome focuses; Rayleigh said the wall traps. Trace rays in an oval and a round room, then run the wave.

A trial writes down what it will measure before it starts, and the registry keeps every version. The rule that reads those versions counts rows, and a row is not a measure. Sixty records, three blind readers, a rubric written before the draw.

The 2010 muonic-hydrogen radius, rebuilt from its measured energy, beside 0.8406 fm from a 2026 measurement in ordinary hydrogen. Then move that measurement’s two frequencies together and watch a precision check miss the entire shift.

Le Verrier’s 1859 sums and Newcomb’s 1882 check, each rerun from the equations its author printed. The excess was real and larger than claimed, and general relativity accounted for it in 1915; the page also finds two small slips in Newcomb’s printed normal equation (8), neither touching his conclusion.

A spike tells you people like the number. The void above it tells you they were fleeing a tax. 31,525,946 registered sales, four statutory dates, eight round-number controls that never move.

The Claremont Shakespeare Clinic’s 2004 odds against the Earl of Oxford’s poems, recomputed from its own published test scores, then the test its critics proposed in 2009 and neither side ran: Shakespeare’s earliest plays scored against ranges from his later ones, with Oxford’s departure planted into copies to show whether the test could have caught it. Whether the odds measure authorship remains open; who wrote Shakespeare is not tested here.

In 1988 a shape-from-shading study put the Face on Mars at 412.5 ± 17.5 m and argued its features would persist under other lights and views. This page relights the HiRISE team’s 2025 terrain model of the hill under the Viking sun, plants the 1988 height into it, and says what held up and what did not.

An IPCC chapter said Himalayan glaciers would very likely disappear by 2035; the IPCC later deleted the paragraph. At the satellite-measured loss held constant the ice lasts until 2146, and 2035 would need 4.17 times that loss; the page plants the claim into a copy of the record to show the record could have seen it.

Extraordinary claims from the record of science, from a counting horse to faster-than-light neutrinos, each rebuilt from its authors’ own numbers, then the test that decided it (or would) tested in turn: the claim planted into its data where they were released, set against its printed sensitivity where they were not. Sorted by verdict, by what decided them and by how long deciding took, with every ledger cell shown, the false ones included.

The night you stand in is a shadow with a measurable top, and at the end of astronomical twilight it is 327.9 km up. The companion film's every pitch is a height in kilometres, and the page hands you the four commands to take the measurement yourself.

Dating the closing of 90 hosts' robots.txt from the Internet Archive, with the band each date comes in.

Every chemical equation in English Wikipedia, balanced by exact integer arithmetic. 678 decidable, 8.3% with more than one correct answer, 20 genuine defects read by hand. Balance anything you type.

Every coined brand name the FDA has approved since 1939, measured against every name approved before it, with a control that forges same-length names from the era's own letter habits.

The look-elsewhere effect applied to the 27.5 Myr pulse of the Earth: their pipeline reproduced exactly, then scored against the search that was actually run. Pre-registered before the first p-value.

The surviving 78rpm record, measured against its own noise: a per-disc edge frequency, a planted-witness detection floor you can operate yourself, and the whole dataset.

Nineteen attempted crossings of one field's instrument onto another field's data, built and refused in the same census, with four refusal benches you can operate.

242,970 field gaugings against 44,538 published flood peaks. Where the rating can be checked it agrees with the measurements to about their own precision. Pick a river and see where the checking stops.

The registry keeps every version of what a trial promised to measure. Set the first against the current one, for 10,099 trials.

Load a page with one ordinary asynchronous bug in it, in your own browser, and watch the same file disagree with itself. Then what a clean sweep of 949 pages is actually worth.

The unsolved Liber Primus, measured completely. One anomaly in 12,956 runes, turned into a bound that excludes the additive cipher family at 9.8 sigma. Sixteen cipher machines on the bench; a one-command verifier for every number.

The confound was in our own page. We searched 26 materials for a specimen that would break it: ten invert, the literature's own disagreement kills nine, and the survivor is far below what a fingertip can resolve.

Forty-nine reference books, 1787 to 1981, asked one question each. The entry swells to a hundred words and a warning that it may speedily induce death, then collapses to a single word. And then it never leaves.

The War of the Dots, measured. Five period figures for one comparison, and the committee's own error data, read off the 1915 report.

Pages you listen to rather than read, built to one rule above the house rule: the sound is the object. Not an illustration of the mathematics, the mathematics itself, made audible.

Nearly every word boundary is decided by the phonemes and a dictionary. Almost no whole sentence is. Both measured, over Moby-Dick, Austen and Shakespeare.