How a leading German modern artist's greatest work was rediscovered in a barn in Cumbria.
BBC Radio 4
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.
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?