Emma Woolerton:How to believe: Everything we see is made up of the infinite atoms that swirl about us. These perceptions are the basis of our certain knowledge about the world
Sean O'Hagan: Captivated by the plight of Piero and his family living in a swamp outside Rome, the Italian photographer created a book that casts them in an eerily beautiful light
Marina Hyde: Alain de Botton believes his new philosopher friend and One Direction star could boost the UK's intellectual capacity almost single-handedly. All Harry needs is help from David Beckham