You might think that conspiracy theorists like the flat earthers don't really think about things. But if you've ever argued with one, you'll find that they do. They have an answer for everything. So how do we reconcile their irrationality with their rational thinking?

Alan Jacobs’s latest book is a guide for thinking seriously in an age of distraction—but it falls prey to the very kind of habits which he aims to counter. By Mike St. Thomas.