On 10th August Why Delusions Matter is out in paperback! One of the key ideas of the book is that we should avoid thinking of beliefs that we find irrational as a sign of a pathology. In the last few days, two open-access papers have been published where I capture some aspects of this idea. In one paper, Is it pathological to believe conspiracy theories? , I ask how we decide that some ways of thinking about the world are pathological. Either those ways are considered to be harmful or the output of a malfunctioning mechanism. But in the case of conspiracy beliefs, harmfulness is hard to ascertain, and beliefs that are harmful in some ways can also bring benefits. For instance, the belief that a vaccine is unsafe and is promoted by health authorities to benefit the pharmaceutical company who produced it may lead someone not to take advantage of the vaccine. As a result, the person is left unprotected against a serious disease. But conspiracy theories also aim to respond to e...