We overuse the em dash in our prose.

We use the em dash more often than easy reading allows, and we are changing how we punctuate.

Cosmetic — how it looks, not what it says.

We counted it across everything we publish. Our 500 companion pages carry about 15 em dashes for every thousand words of body text, and 14 in the short summaries. Our Methods essays, where we write about our own work, run higher still at 16. The published defect records average 14, and the first one we ever posted runs at 19. The daily prompt is the exception at 3, which is closer to what the rest of this writing should look like.

The construction is not wrong. A dash can set off an aside, or land a short clause at the end of a sentence, and sometimes nothing else does the job as cleanly. The problem is frequency. When it turns up in one sentence out of five it stops being a choice and becomes a habit, and the prose takes on a rhythm that tires a reader without their being able to say why.

We want to be plain about why we are changing it. We are not changing our house style to hide our use of AI. We are changing our style to make our prose more comfortable to read. Overuse of em dashes is a rightly recognized tell of AI writing, and it detracts from the reader’s experience. Our goal is prose that is correct, pleasant to read, and easy to understand. Overuse of em dashes is a defect against that goal, and we are treating it as one.

What changes, and where. The daily prompt, the short summary at the top of every companion, and the prose of these defect records go to none: no em dashes at all. Quoted material is exempt everywhere, because a record that cannot quote a sentence cannot show you the evidence for it.

Defect records already published stay as they are. We are not going back to tidy the archive, and you can compare what we wrote before this against what we write after it.

The long pages will change slowly, because the three uses are not one habit. Em dash usage for short reveals will disappear, replaced with clear sentence structure. Then the long trailing clause usage will change to the normal colon construction. Finally, asides will use em dashes only where they earn their place. We measured what ordinary published prose actually does before deciding what earning its place will mean for us: professionally edited health writing runs between one and four em dash constructions per thousand words, and that range is now our target for our long-form prose.

Our Methods essays are exempt. In Methods, we want Craig’s voice and the AI’s voice (which writes “the room” side of each issue) to show clearly as part of us showing our work.

No meaning changes anywhere. This is punctuation and rhythm only. Where a dash is genuinely the clearest structure available it stays, and the sentences that keep one will be the ones that earned it.

Details

Defect f008 · registered 5 September 2026 · amended 5 September 2026

Affects 38 daily prompts, 418 companion pages and 7 pages. 45 corrected.

Affected pages last measured 5 September 2026.

Affected companions

408 more…

The 38 prompts are counted here but have no page of their own — they reach readers in the daily email and in each companion's opening line. 7 pages are counted here but not listed.

All known defects