Vaccine claims, Alzheimer's treatment and Tim's Parkrun times

John Campbell, a YouTuber whose posts get millions of views, has made claims about excess deaths and the covid-19 vaccine. We show why he's incorrect. Also will a much vaunted new treatment for Alzheimer's really change lives - and how much longer can Tim expect his Parkrun times to improve? We look at the trends - and the rest of the team's times.

Presenter: Tim Harford Series Producer: Jon Bithrey Reporters: Nathan Gower, Daniel Gordon, Charlotte McDonald Researcher: Marcus O'Brien Editor: Richard Vadon Production Coordinator: Maria Ogundele