The SymposiumFollowing the overwhelming success of Great Ideas' launch, with a million sold in the UK alone, Penguin now publish a further 20 short, astonishing works of non fiction drawn from the most remarkable writing of the past two and a half thousand years of human thinking. Throughout history, some books have changed the world. They have transformed the way we see ourselves and each other. They have inspired debate, dissent, war and revolution. They have