Real cases
A case · you decide
Caven and Verith check a health headline
Caven & Verith — a 16-year-old on the school paper's fact-check desk
The source: "In a study of 40 mice, a compound slowed tumour growth." A student's summary: "A new compound slows cancer growth."
Verith checks that every claim traces back to the source. The compound and the slowing are there.
Caven guards the caveat. He compares the two sentences and asks what a reader would believe about who was treated.
How should the desk rate the summary?
Leaving out the "only when" is enough to turn a finding into a promise.
A case · you decide
Fabb and Tenet find the extra number
Fabb & Tenet — a 17-year-old checking summaries for a science newsletter
The source says a new bike lane "was followed by fewer reported crashes on the street." A summary says "the bike lane cut crashes by 50%."
Tenet holds the source as the ground truth and asks whether each claim still holds against it.
Fabb checks each claim against the source, word by word: the number, and the verb.
What is wrong with the summary?
If it is not in the source, it is not a summary. It is a new claim.