The campaign to revive the Los Angeles river - from concrete stormdrain to natural habitat
BBC World Service
2/2 Alan 'meets' a car-jacked man in Caracas and an Iranian evading government eavesdropping.
BBC Radio 4
Gareth Mitchell asks how near we are to achieving hypersonic flight.
Why some women are disappointed and angry at the Egyptian revolution's failures.
1/3 Mandy Smith, ex-wife of Rolling Stone Bill Wyman, in conversation with Michael Ford.
Ben Quash considers what we mean when we talk about beauty.
BBC Radio 3
1/5 Louise Welsh hits the 1930s trail blazed round Scotland by Orkney poet Edwin Muir.
1/3 Steve Richards tells the story of David Cameron's quest to reform the state and society.
Why are people in Haiti still living in tents without basic amenities?
1/2 Farayi Mungazi looks at the close links between sport and national identity in South Sudan