# AP53 — source of record

**Verified 11 September 2026** by the paragraph-level test of record. Every source
paragraph of 60 characters or more is present in the published PDF, and every
published sentence of 60 characters or more is present in the source. Nothing was set aside.

| | |
|---|---|
| Published PDF | `/AP53_Gravity_Is_the_Neck.pdf` |
| sha256 | `7a58460d304028bce2ea7b8e91a53f0a7bcadcc21896a2cb6a19202dbf2f2853` |
| Source of record | `AP53_Gravity_Is_the_Neck_FINAL_v1_0.docx` |
| sha256 | `888cab0910fad7c1f625ef4b5cd422e393c38e2fbc0d4831415615b1e8e04231` |
| Found in | the freeze bundle of 11 September 2026, byte for byte |
| Paragraphs compared | 141 |

The published PDF is `AP53_Gravity_Is_the_Neck_FINAL_v1_0.pdf` under the site's name. Harvest from the source of
record. If the published PDF is replaced, this note and the digest are
re-verified at that republish.

*Frozen files are never edited; corrections supersede, dated, in the open.*