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Tom Sutcliffe looks at the role of the expert. The curator Irving Finkel decodes the symbols on a 4,000 year old clay tablet and discovers the instructions for the building of an ark. Harry Collins asks why attitudes towards scientific expertise have changed and looks to reassert the special status of science. Colin Blakemore is an expert in neuroscience and vision and he reflects on his part in the documentary, Tim's Vermeer, which explores the relationship between art and science. The playwright Hattie Naylor tells the story of an astronomer going blind who learns to see the wonder of the universe in a different way. Producer: Katy Hickman.

Last year The Guardian ran a series of scoops about the extent of mass surveillance by the security services here and in the USA. Anne McElvoy talks to the journalist Luke Harding about the inside story on the whistle-blower Edward Snowden and what motivated him to commit one of the biggest intelligence leaks in history. The former director of GCHQ, Sir David Omand, fears the leaks have done untold damage and endangered state security. Claims that America hacked the phone of the German Chancellor Angela Merkel caused uproar in Germany, and the journalist Annette Dittert argues that the memory of the Stasi's spying machine is still raw. There has been little outcry among the British public and the philosopher Alain de Botton explores the nature of news and the 'noise' it generates. Producer: Katy Hickman.

Tom Sutcliffe talks to the celebrated composer, Sir Peter Maxwell Davies on the eve of the premier of his tenth symphony. His latest work creates a musical structure based on architectural proportions, inspired by the 17th century architect Francesco Borromini. Waldemar Januszczak turns to the 18th century and Rococo for his inspiration, and looks at how this artistic movement spread from painting and interior design, to music and theatre. The environment, both built and natural, is key to Trevor Cox's study of sound as he listens intently to the cacophony around us. While the psychologist Victoria Williamson explores our relationship with music, including why we're prone to earworms, certain rhythms repeating endlessly in our heads.Producer: Katy Hickman.