Amir Amirani looks at how the Persian passion for poetry has shaped Iranian identity.
BBC World Service
1/2 Dr Mark Lythgoe tells the untold story of medical imaging.
Why Sun Tzu's words of wisdom - written over 2,500 years ago - are still relevant today
Is Britain's drive to curb bribery and corruption working? Allan Urry investigates.
BBC Radio 4
8/40 Following the work of seabird ecologists on the Isle of May.
3/3 Michael Portillo examines the past and future of democracy over 2,500 years.
1/2 Philip Dodd investigates China's soft power charm offensive.
Mike chats to the UN's new climate chief, meets Daryl Hannah and spots pigs in the sky.
What it means to be a Christian missionary in a hostile country.
Was the World Health Organisation right to declare a global swine flu pandemic?