In his review of the new book The Theory that Would Not Die, Temple mathematician John Allen Paulos explains the mathematics of changing one's mind. The theory, first adopted by 18th-century Presbyterian minister Thomas Bayes, calls for the need to make new decisions or change ways of thinking after the input of new information. "Bayesian reasoning promises to bring our views gradually into line with reality and so has become an invaluable tool for scientists of all sorts and, indeed, for anyone who wants…to sync up with the universe."