Sources and method
Posts where the work is the cross-check: two customs records, two freight indices, two definitions of the same word — and what putting them side by side showed.
- 同款比价：口径不写在旁边，数字就没意义 海外华人·2026-10-09 ·8 min read
五件写了具体型号的东西，中国官方标价与美加官方标价并排摊开；首重续重、体积重除数、行邮税与跨境电商税、汇率取数日逐条写明，算不出的格子写没核到。
- Container rates by route, and why the indices disagree Supply chain·2026-10-09 ·9 min read
Latest public container freight index readings for the main Asia-outbound lanes, each with its as-of date, what the indices actually measure, and what a quote adds on top.
- How an eval set is built, and why it rots AI and engineering·2026-10-09 ·10 min read
An eval set is an instrument with a purpose, a scoring rule, a calibration record and an expiry date. Where the samples come from, what counts as correct, and what makes the set expire.
- One commodity, two customs records Data and the world·2026-10-09 ·9 min read
The same lithium-ion battery shipments counted by the exporter and by the importer. The money nearly matches. The kilograms do not.
- Two urbanisation rates for one country Data and the world·2026-10-09 ·9 min read
China's statistics office says 67.89 per cent of the country lives in a town or city. The World Bank says 66.34. Both have a source, and neither answers the question I had about one county.
- What a China factory quote actually contains Supply chain·2026-10-09 ·9 min read
A field-by-field pass over a quotation for a custom part — what is on the page, which lines carry the money, and which numbers nobody publishes.
- Verifying an email signup end to end AI and engineering·2026-10-08 ·4 min read
The form returned success. The subscriber appeared in the right group. The one thing that failed was in an inbox I do not control.
- What this site actually ships, and the widget I can't remove AI and engineering·2026-10-08 ·4 min read
2,130 bytes of HTML, 1 KB of my own JavaScript, no framework. Then the newsletter form loads jQuery, and the number stops being funny.