Julian Baggini examines the philosophical issues and disputes that lie behind the news headlines. We read about what is happening in the world, but how do we know what the truth is, or whether there is one 'truth' at all? A president has his private sexual affairs discussed and analysed by everyone, but is someone's private life the proper moral concern of others? A 'war' against terrorism is declared, but what justifies the use of armed forces with its inevitable loss of life?