This week Ed and I were talking about the effects of persuasion and how people can seem to gullibly just believe anything. I was explaining about the Barnum effect. Barnum was the great circus master who was into the concepts of illusion and fooling the audience into believing that what they were...

Social media is full of conspiracy theories. Currently those about Katherine Princess of Wales are rife. There is great interest, in certain groups, as to whether the stories about her abdominal surgery and public appearance and photograph are real or fake. The thing that interests Ed and I is...