2/5 Edi Stark finds how twins survive if they lose what for many is their perfect companion.
BBC Radio 4
4/5 Exploring one of our favourite hymns, appealing to that 'still small voice of calm'.
2/2 How science fiction has examined the different ways of continuing the human race.
2/3 The Communist Party's appropriation of religion into Hu Jintao's 'harmonious society'.
Three kilometres underground, the Dinaric Arc has been called Europe's Amazon forest.
BBC World Service
1/5 Edi Stark asks the ultimate twins question: Does any other relationship come close?
Travel competition winner Jane Labous meets the people of Mali who make a living from mud.
Gabriel Gatehouse investigates the mysterious disappearance of Dirar Abu Sisi.
In the Solar System's outer darkness, planet Neptune has its first 'official' birthday.
2/3 Cecil Balmond examines the hidden geometry at the core of the Taj Mahal