Inspired by Wittgenstein's quip that a book on philosophy might consist entirely of jokes I Think, Therefore I Laugh explores topics such as misunderstandings of mathematics and science and of the relation between them, pseudo-science and its appeal, the uses and misuses of probability and statistics, humour and higher order endeavours and the interplay between narrative and numbers. This is a new edition of John Allen Paulos' second of six books and fans will recognise themes he later went on to pursue in other words.