Four posters for the wall where people argue about health. Each one is a single page in my usual greens, with more trees than strictly necessary.

The Twelve Questions. Every question from The Receipts Checklist, in order, on one page. Ask them of a health claim before you believe it. Most claims fall over by question four.

The Two Numbers. A headline says a pill cuts the risk by 40%. Forty per cent of what? Two grids of a hundred people show the risk without it and the risk with it. Then one subtraction and one division tell you how many people it really changes. The numbers are made up. The arithmetic is not.

The Evidence Ladder. From a cell in a dish and a mouse, up through one observational study and many, to one randomised trial and a systematic review of trials, drawn as a tree from the roots to the canopy. With the honest footnote: a big, well-run trial can beat a weak review.

Before you share a health headline. Five quick checks, each with the red flag phrase that gives a headline away, and what a study of 462 university press releases found about where the stretching starts.

Every real number on them comes from a published paper, named so you can read it yourself. They're A4 portrait and print cleanly at A3.

They won't tell anyone what to eat, take or stop. Hang them where the news gets read. A room with a ladder on the wall is harder to fool.