Notes
Each note takes one question, runs it against something real — a tool, a datasheet, our own corpus — and publishes the raw result before the conclusion. Every one ends with the section that makes it worth reading: what this test does not establish. Where a note counts something, the count comes from a script in the repository, so the note and the data cannot drift apart without the script saying so.
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Two yield strengths, one sheet of steel
The same 1.4509 sheet yields at 230 MPa one way and 250 MPa the other. Same standard, same product form, same thickness. Only the test piece turned.
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191 numbers, 82 gaps, nothing above E3
An audit of our own grade pages. Every value we hold, every gap we named, where they came from, and the one document that supplies almost all of it.
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One alloy, two standards, three numbers
Duplex 2205 yields at 450 MPa to ASTM A240 and 500 MPa to EN 10088-2 — but not on the same product form. What the gap is actually made of, and why.
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The AI-designed material that was already in the training set
MatterGen's flagship synthesis was isostructural with a compound reported in 1971 and present in its own reference dataset. What the case teaches about predictions.
What this page does not cover
- Comparative marketing. A note reports what a tool returned on one question on one day. That is not a verdict on the tool.
- Our own conformance. Written up separately and unflatteringly on the self-assessment.