In a rapidly changing world  debating ideas matters more than ever The Battle of Ideas Zurich festival provides a unique forum to discuss the big issues of our time Speakers include Professor Dr Gerhard Schmitt debating do we need an urban revolution  Ronnie Grob debating the threat posed by populism  Thomas Held debating Art  Music  Protest: The Cultural Legacy of 1968 and Michèle Binswanger #MeToo and Andreas Kyriacou whether to separate religion and state in Switzerland