Karl Pilkington is best known for the world-record-breaking podcasts that he does with friends Ricky Gervais and Stephen Merchant... where he is frequently told that he is an idiot.

Karl left school 19 years ago with only one GCSE - an E in history - an exam that he doesn't remember taking. After years of ridicule, he has decided to find out just how intelligent he is and if having more knowledge would make him any happier: "Me mates keep telling me that I should be more intelligent and that I should know more, but... I say, if I did know more, would it make me any happier?"

Karl gets advice from known intellectuals, including Germaine Greer, Will Self and even David Icke, while explaining his concerns on gaining more knowledge.