Patrik Hermansson, a Swedish researcher for the British anti-racist group Hope Not Hate, infiltrated far right groups and spent months undercover. His operation now over, he tells his story, including seeing violence and death in Charlottesville, Virginia - the culmination of the ideologies he had witnessed throughout his time with the alt-right.

Can you fit a guide to questioning dubious statistics on the back of a postcard? Tim Harford gives it a try. He wants us to be curious: asking, why do we “like” one stat but not another, who wants us to see it, and – behind the headline – what is it really telling us.

Job interviews are stressful experiences and have mostly been shown by scientists to be ineffective at picking the best candidate. Catherine Carr explores the cultural and psychological bias that flaws them and asks how we might improve the experience both for the interviewee and interviewer.